中国水稻科学2016，Vol.30Issue(3)：291-303,13.DOI:10.16819/j.1001-7216.2016.5063
茉莉酸甲酯对武运粳24和宁粳3号灌浆早期高温胁迫生理特性的影响
Effects of MeJA on the Physiological Characteristics of japonica Rice Wuyun-jing 24 and Ningjing 3 During Early Grain Filling Stage Under Heat Stress
摘要
Abstract
Methyl jasmonate (MeJA) was used on the conventional japonica rice varieties Wuyunjing 24 and Ningjing 3 to study its effects on rice physiological characteristics under high temperature stress during early grain filling stage . The results indicated that MeJA could increase the accumulation of soluble sugar in rice leaf and keep the osmotic balances .Furthermore ,MeJA increased the stomatal conductance (Gs ) and transpiration rate (Tr ) ,which accordingly reduced the temperature of leaf and panicle and further effectively alleviated the high temperature damages .Exogenous MeJA reduced the heat damages to the photosynthetic system , thereby leading to the increased PS Ⅱ maximum quantum yield (Fv/Fm ) ,photochemical efficiency (ΦPSⅡ ) ,photosynthetic electron transport rate (ETR) ,energy ratio ofphotochemicalreactions(Pr)andnetphotosyntheticrate(Pn).Increasedgrainweightandseedsettingratewere found in those MeJA treated rice plants and antioxidant enzyme activity analysis showed that when exposed to high temperature for 12 days , superoxide dismutase (SOD ) and peroxidase (POD ) antioxidant enzyme activities of Wuyunjing 24 were decreased ,while SOD and POD activities of Ningjing 3 in late stage of high‐temperature treatment were greatly increased compared to the CK .The results indicated that MeJA enhanced the activities of SOD and POD and reduced the accumulation of malonaldehyde(MDA) ,which ultimately increased the membrane stability .In conclu‐sion ,exogenous MeJA could reduce the rice canopy temperature and effectively relieve heat stress injury to plant physi‐ological characteristics .Furthermore ,exogenous MeJA could promote recovery function during recovery stage and fi‐nally mitigate yield losses .关键词
高温胁迫/水稻/灌浆早期/茉莉酸甲酯Key words
heat stress/rice/early grain filling stage/methyl jasmonate分类
农业科技引用本文复制引用
刘霞,唐设,窦志,李刚华,刘正辉,王绍华,丁承强,丁艳锋..茉莉酸甲酯对武运粳24和宁粳3号灌浆早期高温胁迫生理特性的影响[J].中国水稻科学,2016,30(3):291-303,13.基金项目
江苏省基础研究计划资助项目（BK20140721）；江苏高校优势学科建设工程资助项目（PAPD）；江苏省农业三新工程资助项目（SXGC［2012］388）。 （）
