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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。
H2O2 as a signaling molecule can be induced by a variety of stresses and accumulated in the cell, which in turn is involved in regulating the plant’s anti-retrogradation response. The results of far-infrared thermography observation showed that NaCl stress in root could induce the stomatal closure of Vicia faba and the temperature of leaves increased, the content of Na + and H2O2 in leaves increased, and the concentration of H2O2 in transpiration flow increased. In addition, NaCl could directly induce H2O2 production in vitro and did not affect H2O2 content in the epidermis. The transpiration flow juice produced under NaCl stress can directly induce stomatal closure, and this process can be reversed by the antioxidant ascorbic acid (AsA). These results indicate that H2O2, as the root signal of salt stress, may be involved in regulating the stomatal closure of Vicia faba via transport through the vascular system.