摘要
H2O2作为信号分子可被多种胁迫诱导产生并在细胞内积累,进而参与调节植物的抗逆反应。文章通过远红外热成像观察等实验发现,根部NaCl胁迫可诱导蚕豆气孔关闭,叶片温度上升,叶片内Na+和H2O2含量增加,蒸腾流汁液中H2O2浓度升高。另外,NaCl可直接诱导离体蚕豆根产生H2O2,却不能影响表皮条内H2O2含量。NaCl胁迫条件下产生的蒸腾流汁液可直接诱导表皮条气孔关闭,该过程可被抗氧化剂抗坏血酸(AsA)所逆转。这些结果表明,H2O2作为盐胁迫的根源信号,可能通过维管系统运输参与调节蚕豆气孔的关闭反应。
As signaling molecules,hydrogen peroxide（H2O2） generation is induced in plants following exposure to a wide variety of biotic and abiotic stimuli.In this paper,we found that high NaCl concentration in rhizosphere could induce leaf temperature increasing and stomata closing,and increase the concentrations of Na＋ and H2O2 in Vicia faba leaves.The transpiration stream under NaCl stress could induce the stomata closuring,and ascorbic acid（AsA） could partly abolish the transpiration stream-induced stomatal closure.Further experiment indicated that NaCl could not directly induce H2O2 production and stomatal closure in detached leaves,but could directly induce H2O2 production in detached roots.Those indicate that H2O2 may act as root source signal transported by fibrovascular system and mediate stomatal closure of V.faba.
出处
《植物生理学报》
CAS
CSCD
北大核心
2012年第3期265-271,共7页
Plant Physiology Journal
基金
国家自然科学基金(31071240和31140071)
教育部科学技术研究重点项目
省部共建河南大学科研项目
关键词
盐胁迫
过氧化氢
气孔关闭
根源信号
salt stress
hydrogen peroxide（H2O2）
stomatal closure
root source signal
