ABA and GA3 affect the growth and pigment composition in Andrographis paniculata Wall.ex Nees., an important folk herb
Received date: 19 Sep 2008
Accepted date: 02 Dec 2008
Published date: 05 Sep 2009
Copyright
In this study, 5 μmol•L-1 abscisic acid (ABA) and gibberellic acid (GA3) were used to study the effect of both growth regulators on the morphological parameters and pigment composition of Andrographis paniculata. The growth regulators were applied by means of foliar spray during morning hours. ABA treatment inhibited the growth of the stem and internodal length when compared with control, whereas GA3 treatment increased the plant height and internodal length. The total number of leaves per plant decreased in the ABA-treated plants, but GA3 treatment increased the total number of leaves when compared with the control. Both growth regulators (ABA and GA3) showed increased leaf area. ABA and GA3 treatments slightly decreased the total root growth at all the stages of growth. The growth regulator treatments increased the whole plant fresh and dry weight at all stages of growth. ABA enhanced the fresh and dry weight to a larger extent when compared with GA3. An increase in the total chlorophyll content was recorded in ABA and GA3 treatments. The chlorophyll-a, chlorophyll-b, and carotenoids were increased by ABA and GA3 treatments when compared with the control plants. The xanthophylls and anthocyanin content were increased with ABA and GA3 treatments in A. paniculata plants.
Key words： Andrographis paniculata; chlorophyll; growth; xanthophylls; anthocyanin; carotenoids
M. GOMATHINAYAGAM , V. E. ANURADHA , Changxing ZHAO , Gloria A. AYOOLA , C. Abdul JALEEL , R. P. ANNEERSELVAM . ABA and GA3 affect the growth and pigment composition in Andrographis paniculata Wall.ex Nees., an important folk herb[J]. Frontiers in Biology, 2009 , 4(3) : 337 -341 . DOI: 10.1007/s11515-009-0018-5
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