Effects of exogenous abscisic acid pre-treatment of cucumber (<i>Cucumis sativus</i>) seeds on seedling growth and water-stress tolerance

Wang, Shaohui; Sui, Xiaolei; Hu, Liping; Sun, Jianlei; Wei, Yuxia; Zhang, Zhenxian

doi:10.1080/01140671003619274

Cited by 9 publications

(1 citation statement)

References 31 publications

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“…NAA application results in an increase in IAA and ABA under lowtemperature stress (Battal et al 2008). IAA and ABA in turn up-regulate the activities of the antioxidant enzymes, SOD, CAT, APX and GR (Barakat et al 2013;Jiang and Zhang 2002;Tyburski et al 2009;Wang et al 2010). In our study, pretreatment with NAA resulted in a rise in Pn, IAA and ABA concentrations and SOD, CAT, APX and GR activities, along with a decline in MDA content and electrolyte leakage after drought stress.…”

Section: Discussionsupporting

confidence: 55%

Improved drought tolerance by early IAA- and ABA-dependent H2O2 accumulation induced by α-naphthaleneacetic acid in soybean plants

et al. 2016

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a-Naphthaleneacetic acid (NAA), a synthetic auxin, improves plant stress tolerance. A hydroponic experiment was carried out to investigate how NAA pretreatment could improve drought resistance in soybean seedlings. NAA pretreatment triggered an early increase in hydrogen peroxide (H 2 O 2 ), indole-3-acetic acid (IAA) and abscisic acid (ABA), a late elevation of net photosynthetic rate (Pn), a late decrease in malondialdehyde (MDA) and electrolyte leakage and a rise in antioxidant enzyme activities during both early and late phases, under drought stress. However, the application of the ABA biosynthesis inhibitor tungstate and the IAA biosynthesis inhibitors L-Aminooxyphenylpropionic acid and aminoethoxyvinylglycine resulted in an early decrease in H 2 O 2 and an early and late decline in the activities of antioxidant enzymes in NAApretreated stressed plants. Moreover, the inhibitors also induced an increase in H 2 O 2 , MDA and electrolyte leakage and decrease in Pn in the late phase in stressed leaves pretreated with NAA. Similarly, the application of the NADPH oxidase inhibitor diphenyleneiodonium and H 2 O 2 scavenger dimethylthiourea arrested the early accumulation of H 2 O 2 , but not of IAA and ABA in stressed plants pretreated with NAA, and blocked the early and late rise in antioxidant enzyme activities, the late increase in Pn and the late decrease in H 2 O 2 , MDA and electrolyte leakage induced by NAA in drought-stressed plants. Our data suggest that NAA application triggers early IAA-and ABA-dependent H 2 O 2 accumulation, which, in turn, results in an enhancement of antioxidant capacity and drought stress tolerance in soybean seedlings.

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