Effect of Different Concentrations of IAA on the Growth and Starch Accumulation of Duckweed
Effect of Different Concentrations of IAA on the Growth and Starch Accumulation of Duckweed
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DOI：
10.7606/j.issn.1000-4025.2018.09.1722
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发表时间：
2018-01-01
期刊：
影响因子：
--
通讯作者：
Zhao Qi
中科院分区：
文献类型：
--
作者：
Chen Xiaoyi;Li Rui;Zhao Qi
以新能源植物浮萍为试材，研究了0.001、0.01、0.1、1、10 μ mol/L（0 μ mol/L为对照）5种不同浓度的吲哚乙酸（IAA）对浮萍生长和淀粉积累的影响。结果表明：（1）低浓度（0.001、0.01和0.1 μ mol/L）的IAA能有效促进浮萍叶绿素含量、净光合速率和生物量的增加，其中0.001 μ mol/L的IAA处理的叶绿素含量、净光合速率和生物量分别比对照组提高了14.7%、10.6%和28.1%; (2)高浓度（1和10 μ mol/L）的IAA可调节淀粉的积累，提高淀粉合成中的关键酶--ADP-葡萄糖焦磷酸化酶（AGG）的活性。10 μ mol/LIAA处理的淀粉含量和AGEs活性分别比对照提高了35.0%和14.1%。结果表明，低浓度IAA处理能有效促进浮萍叶绿素的合成和光合作用，有利于生物量的积累;高浓度IAA处理能通过提高AG-ATPase活性，促进淀粉含量和总淀粉的积累。
New energy plant duckweed was used as material, we studied the effects of five different concentration of IAA at 0.001, 0.01, 0.1, 1 and 10 mu mol/L (0 mu mol/L as control) on the growth and starch accumulation of duckweed. The results showed that: (1)Low concentrations (0.001, 0.01 and 0.1 mu mol/L) of IAA could effectively promote the chlorophyll content, net photosynthetic rate and biomass yield of duckweed, which significantly increased by 14.7%, 10.6%, and 28.1% compared with the control group at the concentration of 0.001 mu mol/L IAA. (2) High concentrations (1 and 10 mu mol/L) of IAA can regulate the starch accumulation and increase the activity of AGPase (ADP-glucose pyrophosphorylase), a key enzyme in starch synthesis. As compared to the control, the starch content and AGPase activity were significantly increased by 35.0% and 14.1% at 10 mu mol/L IAA treatment, respectively. These results suggest that low concentration of IAA treatment can effectively promote the biosynthesis of chlorophyll and photosynthesis of duckweed, which is conductive to the accumulation of biomass, and high concentration of IAA can promote the starch percentage and total starch accumulation by enhancing the activity of AG-Pase.