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采用持续干旱和淹水处理,测定太阳扇的叶绿素、可溶性蛋白、可溶性糖、脯氨酸、丙二醛含量和抗氧化酶体系等指标的变化,分析太阳扇对不同程度水分胁迫响应特征的差异及形成的机制。结果表明:水分胁迫初期(5d)内,太阳扇受害指数和大部分生理生化指标与对照差异不显著;随着干旱胁迫强度的增加和时间的延长,太阳扇产生较严重的伤害直至最后死亡,其受害指数、脯氨酸含量、SOD、POD、CAT活性均急剧上升,叶绿素含量明显减少,而丙二醛、可溶性蛋白、可溶性糖含量呈先减少而后增加的趋势;淹水胁迫下,太阳扇可溶性糖和叶绿素含量呈先下降到实验后期有所上升,丙二醛和可溶性蛋白含量呈降-升-降的趋势,SOD、POD活性实验初期增加然后有所减少,CAT活性和脯氨酸含量均呈持续上升趋势;持续干旱和淹水胁迫对太阳扇形态和生理特征造成严重影响,太阳扇对淹水胁迫的响应不及干旱胁迫,持续干旱对扦插苗伤害较大,太阳扇基本丧失自我调节适应不良环境的能力。
Under continuous drought and flooding treatment, the changes of solar greenhouse chlorophyll, soluble protein, soluble sugar, proline, malondialdehyde content and antioxidant enzyme system were measured. The response characteristics of solar fan to different degrees of water stress were analyzed And the formation of the mechanism. The results showed that in the early stage of water stress (5 days), the index of damage and most physiological and biochemical indexes of solar fan were not significantly different from those of the control. With the increase of drought stress and the prolongation of time, the solar fan produced more serious injury and finally died, Proliferation index, proline content, SOD, POD and CAT activity increased sharply, chlorophyll content decreased significantly, while malondialdehyde, soluble protein and soluble sugar content decreased first and then increased; The content of soluble sugar and chlorophyll decreased first and then increased in the later period of experiment, the content of malondialdehyde and soluble protein showed a decreasing-rising-decreasing trend. The activity of SOD and POD increased at the beginning and then decreased, while CAT activity and proline content Both the continuous drought and waterlogging stress had a serious impact on the morphological and physiological characteristics of the solar fan. The response of the solar fan to waterlogging stress was less than that of drought stress. Continuous drought caused more damage to the cutting seedlings and the solar fan basically lost self-regulation Adapt to the bad environment ability.