FUNCTIONAL GAIN OF FRUIT NETTED-CRACKING IN AN INTROGRESSION LINE OF TOMATO WITH HIGHER EXPRESSION OF THE FNC GENE

Chunli ZHANG, Taotao WANG, Jing LI, Danqiu ZHANG, Qingmin XIE, Shoaib MUNIR, Jie YE, Hanxia LI, Yongen LU, Changxian YANG, Bo OUYANG, Yuyang ZHANG, Junhong ZHANG, Zhibiao YE

Front. Agr. Sci. Eng. ›› 2021, Vol. 8 ›› Issue (2) : 280-291.

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Front. Agr. Sci. Eng. ›› 2021, Vol. 8 ›› Issue (2) : 280-291. DOI: 10.15302/J-FASE-2020374
RESEARCH ARTICLE
RESEARCH ARTICLE

FUNCTIONAL GAIN OF FRUIT NETTED-CRACKING IN AN INTROGRESSION LINE OF TOMATO WITH HIGHER EXPRESSION OF THE FNC GENE

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Highlights

• A novel netted-cracking fruit phenotype was discovered in tomato introgression line IL4-4.

• A single dominant gene (FNC) determined the fruit netted-cracking phenotype.

• The high transcript level of FNC results in the functional gain of fruit netted-cracking and it was found to be a common mechanism in a diverse range of plant species.

Abstract

Fruit cracking is a major disorder that affects the integrity of fruit and reduces the commercial value of tomato and other fleshy fruit. Here, we have found a novel fruit ‘netted-cracking’ (FNC) phenotype in tomato introgression line IL4-4 which is present in neither the donor parent (LA0716) nor the receptor parent (M82). An F2 population was generated by crossing IL4-4 with M82 to genetically characterize the FNC gene and this showed that a single dominant gene determined fruit netted-cracking. Further map-based cloning narrowed down the FNC locus to a 230 kb region on chromosome 4. Sequencing and annotation analysis show that FNC (Solyc04 g082540) was the most likely candidate gene. Functional characterization of FNC by overexpressing FNCAC and FNCIL4-4 resulted in the fruit netted-cracking phenotype, suggesting that the FNC transcript level results in the functional gain of fruit netted-cracking. These findings were further confirmed by FNC ortholog in netted-cracking pepper and melon, indicating a common regulatory mechanism in different plant species. Furthermore, cytoplasm and nucleus-localized FNC indicates increased expression of genes involved in suberin, lignin, lipid transport and cell wall metabolism. These findings provide novel genetic insights into fruit netted-cracking and offer a way to promote molecular improvement toward cracking resistant cultivars.

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Keywords

fine mapping / fruit netted-cracking / introgression line / transcript level

Cite this article

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Chunli ZHANG, Taotao WANG, Jing LI, Danqiu ZHANG, Qingmin XIE, Shoaib MUNIR, Jie YE, Hanxia LI, Yongen LU, Changxian YANG, Bo OUYANG, Yuyang ZHANG, Junhong ZHANG, Zhibiao YE. FUNCTIONAL GAIN OF FRUIT NETTED-CRACKING IN AN INTROGRESSION LINE OF TOMATO WITH HIGHER EXPRESSION OF THE FNC GENE. Front. Agr. Sci. Eng., 2021, 8(2): 280‒291 https://doi.org/10.15302/J-FASE-2020374

Introduction

The flowering period of cotton is from flowering to boll opening, which is the most sensitive period for water supply, with a high incidence of pests and diseases[1,2]. Therefore, it is important to ensure full water supply and pest control during the flowering of cotton[3,4]. In recent years, unmanned aerial vehicles (UAV) have been introduced as carriers to apply chemicals for the prevention and control of pests and diseases of cotton[57], due to their high efficiency, strong capability, low damage to crops and low cost. The spraying of pesticides by UAV usually involves low volumes and high concentrations with small droplet size because of the UAV weight and tank limits[8,9]. Consequently, the volume of spray per unit area is much lower than for spraying with ground-based machinery[10]. In addition, cotton usually has a high planting density with dense foliage during the flowering period[11], so it is imperative to ensure effective droplet deposition of pesticides on cotton leaves.
The surface wetting characteristics of leaves and the inclination of leaf blades have been shown to have a significant effect on the deposition of pesticide droplets in a large number of studies[1219]. Yang et al.[12] carried out an indoor spraying test with different leaf inclination angles in cotton, rice and wheat using a spraying crane. The results showed that better deposition on the plant leaves was associated with good surface wettability (cotton), and low inclination angle. Xu et al.[13] analyzed the effects of application volume, droplet size, blade inclination and spray adjuvant on the deposition of pesticides on rice leaves and found that of the four factors the blade inclination had the greatest influence on deposition. Lan et al.[14] evaluated the wetting and deposition effects of four different aviation adjuvants on cotton leaves in fixed-wing aircraft spray tests, and showed that the use of adjuvants can help promote better wetting of liquids on cotton leaves, and thus increase the deposition quantity. Jia et al.[15] studied the relationship between droplet spray angles of small diameter droplets and wetting characteristics of plant leaf surfaces, and found that by controlling the spray parameters the best spraying deposition can be achieved. In addition, the effect of the prewetting action of dew on pesticide deposition on rice leaves was studied and indicated that dew can significantly increase the droplet deposition quantity[16]. In other research, it has also been found that the contact angle of droplets falling on dry leaf blade surfaces was much smaller than for those falling on blades prewet with liquid, with this smaller contact angle improving wettability[1719].
Although there has been considerable research on surface wetting characteristics of plant leaves and the inclination of leaf blades, there has been no detailed analysis of pesticide deposition using UAV in cotton, especially for prewetting applications. This paper reports an experiment using a small, single-rotor, electric UAV spray with different prewetting capacity based on the precision operating flight parameters obtained by a light airborne BeiDou Real-time kinematic (RTK) differential system. The deposition quantities on cotton leaves at different inclination angles during the flowering period were analyzed, and corresponding conclusions should provide a theoretical guide for improving the application of pesticides by UAV in cotton.

Materials and methods

Experimental site and UAV

The experiment was conducted at the research farm (85°98′ E, 44°56′ N) of Shihezi City, Xinjiang Region, China. The test crop was cotton in the flowering period with a planting density of 1.8 × 105 plants per hm2, planted with narrow and broad row widths (15 and 60 cm) at a plant spacing of 9 cm. Each plant had an average 25 leaves in 6 layers and average height of 60–80 cm.
Two HB-Y-15L single-rotor electric UAVs (High Technology New Farming Co., Ltd, Shenzhen, China), designated UAVX and UAVY, were used in spraying experiments. The UAV and spraying test sites are shown in Fig. 1. UAVX was used for water spray prewetting, and UAVY for pesticide spraying operations. A light airborne BeiDou RTK differential system developed by South China Agricultural University with RTK differential positioning function was also used. The data acquisition interval was 0.1 s for recording flight parameters in real time and drawing actual operation trajectories as references for spray effect analysis. The specifications of the UAV and carrying equipment are listed in Table 1.
Fig.1 UAV and test site. (a) Spray test site; (b) layout of sampling points.

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Tab.1 Specifications of the unmanned aerial vehicle (UAV) and its carrying equipment
Main parameter Norms and numerical
UAV type HB-Y-15L
Size/mm 1955 × 455 × 625
Main/tail rotor diameter/mm 2143/360
Maximum load/L 16
Setting spray volume/(L·hm-2) 15
Flight height/m 1–3
Flight speed/(m·s-1) 0–8
Effective swath/m 4–7
BeiDou plane accuracy/mm (10+ 5 × D × 10-7)a
BeiDou elevation accuracy/mm (20+ 1 × D × 10-6)a

Note: a D is actual distance measured by BeiDou, unit, km.

The UAV spray was equipped with pressure fan-shaped nozzles facing downwards with 5 nozzles at 3550 mm intervals along the direction of the spray bar perpendicular to the axis of the aircraft. Total flow rate was measured at 2.4 L·min-1.

Experimental design

A staining agent, 0.8% (w/v) ponceau 2R (Huyu Biotechnology Co., Ltd, Shanghai, China) dissolved in deionized water was used as a substitute for pesticide in spraying operations. Sample collection cards, 76 mm × 26 mm, were water-sensitive paper (WSP) (Syngenta Crop Protection LLC, Basel, Switzerland).
Four areas within a cotton field (20 m × 6 m) were selected as test plots (plots A to D) with the inter-block spacing 10 m. The central axis of each plots was taken as the main route for spraying operations. According to the effective swath width of the UAV, each plot had a UAV acceleration area (10 m × 6 m) and a sampling area (10 m × 6 m). The sampling area consisted of nine sampling points with horizontal spacing of 2 m and longitudinal spacing of 3 m (Fig. 2a), which confirmed that four single-pass application tracks were in accordance with the set trajectory (Fig. 2b).
Fig.2 Sampling points and flight trajectory. (a) Layout of sampling points; (b) measured flight trajectory.

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In each test, the majority of prewetting water was uniformly sprayed onto the designated test plots by UAVX. This water contained 232 ppm dissolved solids. Taking into account the daily irrigation water applied during the flowering period of cotton in Xinjiang[20], the maximum prewetting volume did not exceed the daily irrigation water quantity. The prewetting water volume for the four plots was 0, 1.6, 3.2 and 4.8 L per 120 m2 (plots A–D, respectively). After prewetting, spraying with UAVY was performed on plots in a single-pass according to set trajectory with flight height of 2 m and velocity of 4 m·s-1.
A Kestrel 5500 Link micro meteorological station (Nielsen-Kellerman Co., Boothwyn, PA, USA) was located at a height of 2 m above ground and well away from the flight route. The ambient weather data, including temperature, humidity, wind velocity and wind direction, was recorded every 5 s during the experiment.
After spraying, three samples were taken at each sampling point in the cotton canopy: sampling points 1–3 (0°–30° leaf blade angle), 4–6 (30°–60°), and 7– 9 (60°–90°). Nine WSP sampling points were also placed at the corresponding angles in plot A to serve as controls for WSP analysis.

Sampling methods

Water-sensitive paper collection and data processing

After spraying of plot A by UAVY, the WSP cards were gathered immediately by an operator wearing disposable gloves, placed in marked envelopes and stored in a cool place until being transferred to the laboratory, where they were analyzed using image processing software, DepositScan (USDA. Wooster, OH, USA) and the droplet deposition quantity per card determined. The mean deposition quantity and coefficient of variation (CV) were also calculated and the CV was used to characterize the uniformity of the deposition distribution, the smaller the CV, the more uniform of droplet deposition distribution.

Cotton leaf collection and data processing

When droplets on the cotton leaves had dried after each spraying application by UAVY, leaves were collected as described above for WSP. The absorbance values of different concentrations of ponceau 2R were first calibrated with detection wavelength of 504 nm by UV755B UV-Vis spectrophotometer (Youke Instrument Co., Ltd, Shanghai, China), and a standard curve of concentration and absorbance was obtained to facilitate the determination of the deposition quantity in the subsequent experiments (Fig. 3).
Fig.3 Ponceau 2R standard curve

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The standard curve equation was:
y=0.0951x0.0129(R2=0.9992)
where x is the concentration of ponceau 2R (mg·L-1), and y is the absorbance values.
For each leaf analysis test, 20 mL of deionized water was added to the collection dish and eluted after 2-min agitation. Then the absorbance was measured by UV755B UV-Vis spectrophotometer at an absorption wavelength of 505 nm. After absorbance measurements were completed, the cotton leaves were dried and individually scanned. The scanned images were processed by image processing software, Adobe PhotoShop CS6 (Adobe Systems Incorporated, San Jose, CA, USA), to determine the leaf area. The calculation formula for deposition was:
Md=x×VwN×As
Md%=Md×10000Mv
where x is the concentration of ponceau 2R (mg·L-1); Vw is the volume of eluent added (mL); N is the concentration of the spray liquid (g·L-1); As is the area of cotton leaves (cm2); Md is the quantity of liquid deposited on cotton leaves (µL·cm-2); Mv is the setting spray volume, expressed in liters per hectare (L·hm-2); Md% is the measured deposition quantity as a percentage of the setting spray volume (%).

Statistical analyses

To further demonstrate the effect of prewetting on the deposition on cotton canopies with different leaf inclination angles, the prewetting volume was divided into four levels, and the deposition quantities on leaves of different inclinations analyzed by least-significant difference test (P = 0.05).

Results and discussion

Operating parameters and environmental conditions

After accurate measurements by the light airborne BeiDou RTK differential system, the flight height (distance from the cotton canopy), flight velocity and effective flight distance were obtained. For the four tests, the mean flight altitude was 1.86 m with CV of 4.46%, and the mean flight velocity was 4.16 m·s-1 with CV of 4.09%. UAVY operational parameters and the corresponding meteorological data are showed in Table 2. It was confirmed that the actual operating parameters met the requirements of the test design.
Tab.2 Relevant test parameters
Test plot Wind velocity and direction/(m·s-1) Mean
temperature/°C
Mean humidity/% Flight height/m Flight
velocity/(m·s-1)
Effective flight distance/m
A 1.1 SE 31.2 30.2 1.93 4.03 36.33
B 0.7 SE 30.7 31.6 1.89 4.09 36.84
C 0.8 SE 30.1 33.7 1.88 4.11 37.01
D 0.9 SE 29.4 31.1 1.74 4.41 35.31

WSP analysis of droplet deposition

The WSP analysis of droplet deposition for plot A is shown in Fig. 4. The horizontal coordinates indicate the position and leaf blade angle for each sampling point, and the vertical coordinates indicate the mean droplet deposition quantity corresponding to each sampling point.
The droplet deposition quantity at sampling points 2, 5 and 8 down the center of the route was larger than for the sampling points to the sides of the route (Fig. 4). The mean droplet deposition in plot A was 0.056 mL·cm-2 with CV of 36.0%. The mean droplet deposition at sampling points 1–3 for leaf blade angle of 0°–30° was 0.065 mL·cm-2, for points 4–6 at 30°–60° it was 0.058 mL·cm-2, and for points 7–9 at 60°–90° it was 0.047 mL·cm-2. The highest value occurred at 0°–30° at points 1–3 and the lowest at 60°–90° in points 7–9. WSP analysis showed that the droplet deposition decreased gradually with the increase of blade inclination.
Fig.4 Droplets deposition in plot A at three leaf blade angles

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Elution analysis of droplet deposition

The percentage mean droplet deposition of the set spray volumes for each prewetting spray test are shown in Fig. 5. The mean droplet deposition quantities in plots A–D plots were 30.8%, 43.1%, 33.8% and 38.5% of the total spraying quantity, respectively. Compared with plot A without a water prewetting treatment, the droplet deposition in plots B–D increased by 39.8%, 9.7% and 24.9%, respectively, after different degrees of prewetting treatment.
Fig.5 Percentage of mean droplet deposition in each of the four test plots

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The percentage of droplet deposition of the set spray volume at each sampling point for each prewetting spray test is shown in Fig. 6. Sampling point 2 in plots B and D had the largest increase in droplet deposition, 140% and 62%, respectively. Also, the difference between droplet deposition under the center of the route and the sides of the route decreased gradually with the increasing inclination of the leaf blades.
Fig.6 Variation percentage of deposition quantity in each plot at 9 sampling points

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To further examine the difference in droplet deposition with different water prewetting volumes and leaf blade inclinations, the mean droplet deposition for each angle range was calculated. The results (Table 3) shows that when prewetting was not performed, the droplet deposition quantity decreased with the increasing leaf blade inclination. After prewetting, the mean droplet deposition in each angle range increased, with the increase for leaf blade angle range of 60°–90° the greatest, increasing from 0.043 to 0.062 and 0.057 mL·cm-2 in plots B and C, respectively.
In addition, with the increase in prewetting volume, the mean droplet deposition quantity for each leaf blade angle showed an increasing then decreasing trend. The reason for this phenomenon is that the presence of prewetting water can reduce the droplet bounce, and lead to an increase in droplet deposition. However, if the volume of prewetting water is too great, close to or exceeding the maximum retention of cotton leaves, this can result in the subsequent spray application reaching the depositional loss point, thereby reducing the quantity of spray deposited.
Tab.3 Droplet deposition at different prewetting volumes and leaf blade inclinations
Plot Prewetting volume/(L·120 m-2) Mean droplets deposition at each angle range/(µL·cm-2)
0°–30° 30°–60° 60°–90°
A 0 0.050 a 0.046 a 0.043 a
B 1.6 0.080 b 0.052 a 0.062 b
C 3.2 0.054 a 0.041 a 0.057 b
D 4.8 0.068 ab 0.057 a 0.048 ab
Mean value 0.063 0.049 0.052

Note: Means followed by the same letter within a column are not significantly different (LSD, P<0.05)

According to the statistical analysis (Table 3), for leaf blade angles 0°–30° and 60°–90° there were significant differences between no prewetting and prewetting at 1.6 L per 120 m2, whereas for 30°–60° there was not significant effect. Also, for 60°–90° with prewetting of 3.2 L per 120 m2 the deposition was significantly greater than with no prewetting.
The results (Table 4) show that the deposition uniformity deteriorated with prewetting at the leaf blade angle range of 0°–30°. It was concluded that this was related to the large increase in deposition quantity at some sampling points after prewetting. Deposition uniformity for 30°–60° and 60°–90° after prewetting improved significantly, perhaps because at these larger leaf blade angles the droplets were more likely to spread by gravity improving the effectiveness of prewetting. In addition, it was likely to be more effective in reducing bounce and slippage of droplets on prewet leaves compared with the dry leaves at the same angle, so both droplet deposition quantity and uniformity improved.
Tab.4 Droplet deposition uniformity at different prewetting volumes and blade inclinations
Test plot Prewetting volume/(L·120 m-2) Droplets deposition uniformity at each angle range/%
0°–30° 30°–60° 60°–90°
A 0 32.8 41.0 51.9
B 1.6 74.3 27.3 36.8
C 3.2 39.6 32.7 17.8
D 4.8 46.5 26.5 30.6
Mean value 48.3 31.9 34.2

Comparison of WSP and elution analysis of droplet deposition

Taking plot A spraying as an example, the results showed that the trends in droplet deposition were consistent between the two analytical methods. The elution analysis of droplets deposition per unit area of cotton leaf on plot A showed that the mean droplet deposition quantity at sampling points 1–3 for 0°–30° blade inclination was 0.050 mL·cm-2, at points 4–6 for to 30°–60° it was 0.046 mL·cm-2, and at points 7–9 for 60°–90° it was 0.043 mL·cm-2. Also, droplet deposition quantity decreased gradually with increasing blade inclination, which was similar to the results of WSP analysis. However, the mean droplet deposition quantity of plot A measured using WSP was 0.056 mL·cm-2, whereas measured by leaf elution it was 0.046 mL·cm-2. Likewise, the values at each angle range were also larger using WSP compared to leaf elution.
The difference in measurement method might be the main cause of this phenomenon, the material and shape of WSP were different from cotton leaves, and WSP had a strong hydrophilicity with color changing immediately after contact with water. When the droplets fall on the cotton leaves they can bounce or slip leaving no or minimal deposition, while droplets that contacted the WSP, due to the characteristics of WSP, do not bounce and slip, but immediately cause color changes recorded as deposition. Therefore, under the same spraying conditions, WSP and elution analysis results will be different.

Conclusions

In this research, flowering cotton plants were sprayed with 0.8% (w/v) ponceau 2R by an electric single-rotor UAV after prewetting at different volumes. By comparing the relationship between prewetting volume, inclination of the leaves and droplet deposition quantity and uniformity, the following conclusions were drawn.
(1) Prewetting significantly increased the quantity of liquid droplets on the cotton leaves.
(2) Different prewetting volume had different effects on droplet deposition. The most significant increase compared to no prewetting was observed with prewetting of 1.6 L per 120 m2.
(3) Different leaf inclinations had different effects on droplet deposition. Without prewetting, the droplet deposition quantity decreased with increasing leaf blade angle. After prewetting, the mean droplet deposition quantity increased across all leaf blade angles, and this was most obvious for leaf blades at 60°–90°. Also, with the increasing of prewetting volume, the mean droplet deposition quantity first increased then decreased.
(4) Droplet deposition without prewetting using WSP and ponceau 2R elution methods showed consistent trends, although the estimates of droplet deposition quantities were slightly higher using theWSP method.

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Supplementary materials

The online version of this article at https://doi.org/10.15302/J-FASE-2020374 contains supplementary materials (Figs. S1–S6; Tables S1–S3).

Acknowledgements

This work was supported by grants from the National Natural Science Foundation of China (31672149 and 31991182), the National Key Research and Development Program of China (2017YFD0101902), and CARS-23-A-03.

Compliance with ethics guidelines

Chunli Zhang, Taotao Wang, Jing Li, Danqiu Zhang, Qingmin Xie, Shoaib Munir, Jie Ye, Hanxia Li, Yongen Lu, Changxian Yang, Bo Ouyang, Yuyang Zhang, Junhong Zhang, and Zhibiao Ye declare that they have no conflicts of interest or financial conflicts to disclose. This article does not contain any studies with human or animal subjects performed by any of the authors.

RIGHTS & PERMISSIONS

The Author(s) 2020. Published by Higher Education Press. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0)
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