Alleviation effects of IAA foliar spray on waterlogging stressed rapeseed at budding stage

doi:10.7505/j.issn.1007-9084.2015.01.009

Abstract

Abstract:

To understand the alleviation effect of indole-3-acetic acid (IAA) on waterlogging stressed rapeseed at budding stage, pot experiment was carried out to investigate the growth and physiology of stressed Brassica napus cv Qingyou 7 (susceptive) and Suyou 4 (tolerant) plants before and after IAA (0.1 mmol/L) foliar spray. Results showed that 10 days of waterlogging inhibited rapeseed growth, biomass and chlorophyll content decreased. The increased physiological index included enzyme activities of SOD (superoxide dismutase), sucrose synthase, sucrose phosphate synthase, contents of GSH (glutathione), AsA (acrylonitrile styrene acrylate copolymer), MDA (malondialdehyde) and soluble sugar. When IAA sprayed after waterlogging, the alleviation effects were significant, especially on susceptive cultivar Qingyou 7. The leaf photosynthetic pigment contents were increased, which started promoting plant growth 5d after spray. SPS (sucrose phosphate synthase) activity decreased, resulting reduced sucrose. Decreased SS (sucrose synthase) activity reduced sucrose decomposition. After 15d of spray, root dry weight of both cultivars increased significantly, and stem dry weight increased in the susceptive. Yield traits recovered significantly, especially on pods per plant and seeds per pod. But the effect of IAA after waterlogging was less effective on oxidation system.

Key words: Brassica napus L., Waterlogging, IAA, Alleviation effect, Growth, Physiological characteristics

TAO Xia, LI Hui-lin, WAN Lin, ZHOU Qin, JIANG Hai-dong* . Alleviation effects of IAA foliar spray on waterlogging stressed rapeseed at budding stage[J]. 中国油料作物学报, 2015, 37(1): 55-.

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