Priming effect of abscisic acid on alkaline stress tolerance in rice (Oryza sativa L.) seedlings

Plant Physiology and Biochemistry : PPB
Li-Xing WeiZheng-Wei Liang

Abstract

Saline-alkaline stress is characterized by high salinity and high alkalinity (high pH); alkaline stress has been shown to be the primary factor inhibiting rice seedling growth. In this study, we investigated the potential priming effect of abscisic acid (ABA) on tolerance of rice seedlings to alkaline stress simulated by Na2CO3. Seedlings were pretreated with ABA at concentrations of 0 (control), 10, and 50 μM by root-drench for 24 h and then transferred to a Na2CO3 solution that did not contain ABA. Compared to control treatment, pretreatment with ABA substantially improved the survival rate of rice seedlings and increased biomass accumulation after 7 days under the alkaline condition. ABA application at 10 μM also alleviated the inhibitory effects of alkaline stress on the total root length and root surface area. Physiologically, ABA increased relative water content (RWC) and decreased cell membrane injury degree (MI) and Na(+)/K(+) ratios. In contrast, fluridone (an ABA biosynthesis inhibitor) decreased the RWC and increased MI in shoots under the alkaline conditions. These data suggest that ABA has a potent priming effect on the adaptive response to alkaline stress in rice and may be useful for improving rice growth in sali...Continue Reading

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Citations

Nov 16, 2017·Molecules : a Journal of Synthetic Chemistry and Natural Product Chemistry·Jing QiaoXiaojun Ma
Jun 13, 2019·Environmental Science and Pollution Research International·Mansi SharmaRavinder Kumar Kohli
Aug 23, 2017·Plant Signaling & Behavior·Cheng ZhouJianfei Wang
Dec 31, 2020·Plants·Mohammad Saidur RhamanMirza Hasanuzzaman
Sep 25, 2021·Journal of Environmental Quality·Theivanayagam MaharajanSavarimuthu Ignacimuthu

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