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Frontiers of Agricultural Science and Engineering

Front. Agr. Sci. Eng.    2016, Vol. 3 Issue (4) : 363-367     https://doi.org/10.15302/J-FASE-2016122
RESEARCH ARTICLE |
Relationship between the number of tapping-induced secondary laticifer lines and rubber yield among Hevea germplasm
Yueyi CHEN1,2,Xinsheng GAO1,2,Xiaofei ZHANG1,2,Weimin TIAN1,2()
1. Key Laboratory of Biology and Genetic Resources of Rubber Tree, Ministry of Agriculture, Danzhou 571737, China
2. State Key Laboratory Incubation Base for Cultivation and Physiology of Tropical Crops, Rubber Research Institute, Chinese Academy of Tropical Agricultural Sciences, Danzhou 571737, China
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Abstract

The lack of suitable early selection parameters means that traditional rubber breeding for yield is time-consuming and inefficient. Laticifer is a tissue specific for natural rubber biosynthesis and storage in rubber tree. The number of the secondary laticifers in the trunk bark tissues is positively correlated with rubber yield in the matured rubber trees that are regularly tapped. In the present study, the rubber yield from 280 of 4–5 year-old virgin trees from 7 cross combinations was compared with the number of newly differentiated secondary laticifers caused by tapping. Results showed that the number of tapping-induced lines of secondary laticifers varied in different germplasm and was positively related to the rubber yield, indicating this could be used as a suitable parameter for early evaluation of yield potential of rubber trees.

Keywords Hevea brasiliensis      rubber yield breeding      early evaluation      tapping      secondary laticifer differentiation     
Corresponding Authors: Weimin TIAN   
Just Accepted Date: 19 December 2016   Online First Date: 05 January 2017    Issue Date: 22 January 2017
 Cite this article:   
Yueyi CHEN,Xinsheng GAO,Xiaofei ZHANG, et al. Relationship between the number of tapping-induced secondary laticifer lines and rubber yield among Hevea germplasm[J]. Front. Agr. Sci. Eng. , 2016, 3(4): 363-367.
 URL:  
http://journal.hep.com.cn/fase/EN/10.15302/J-FASE-2016122
http://journal.hep.com.cn/fase/EN/Y2016/V3/I4/363
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Yueyi CHEN
Xinsheng GAO
Xiaofei ZHANG
Weimin TIAN
Fig.1  Light micrographs of bark cross-sections, showing the tapping-induced secondary laticifers. The lines of lacticifers appear dark brown or black in these sections. The number of lines of induced secondary laticifers was>6 (a), 5–6 (b), 3–4 (c), and<3 (d). The secondary laticifers lines in the white, red, and orange squares were formed under natural conditions before tapping, in the first half year, and in the second half year after tapping, respectively. Ca, vascular cambia. Scale bars, 200 µm.
Fig.2  Difference in the tapping- induced secondary laticifer and rubber yield among Hevea germplasm
Fig.3  Relationship between the ability to differentiate secondary laticifers and rubber yield. (a) Trees with rubber yield>150 g; (b) trees with rubber yield>100 –150 g; (c) trees with rubber yield>50 – 100 g; (d) trees with rubber yield≤50 g.
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