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为阐明多胺及其抑制剂对干旱胁迫下李幼苗叶片叶绿素总含量、光合指标(Pn,Gs,Ci和Tr)和游离态多胺(Putrescine:Put,Spermidine:Spd和Spermine:Spm)含量的影响,以‘秋姬’李为试材,设置6个处理(CK,Drought:Dr,CK+Spd,Dr.+Spd,Dr.+MGBG和Dr.+MGBG+Spd),处理60 d后检测李幼苗叶片叶绿素总含量、光合指标和游离态多胺含量。结果表明,干旱胁迫下,李幼苗叶片中叶绿素总含量和光合指标下降,3种游离态多胺含量上升;多胺处理促进了干旱胁迫下3种指标的上升;抑制剂处理降低了干旱胁迫下游离态多胺Spd和Spm的含量。多胺可通过提高干旱胁迫下李幼苗叶片的光合性能和3种游离态多胺的含量,提高李幼苗的抗旱性。
To clarify the effects of polyamines and their inhibitors on chlorophyll content, photosynthetic parameters (Pn, Gs, Ci and Tr) and free radical polyamines (Putrescine: Put, Spermidine: Spd and Spermine: Spm) under drought stress (CK, Drought: Dr, CK + Spd, Dr. + Spd, Dr. + MGBG and Dr. + MGBG + Spd) Total leaf chlorophyll content, photosynthetic index and free polyamine content in seedling leaves. The results showed that under drought stress, the total chlorophyll content and photosynthetic index decreased in leaves and the contents of three free polyamines increased. Polyamine treatment promoted the increase of three kinds of indexes under drought stress. Inhibitors decreased the content of free radicals Polyamine Spd and Spm content. Polyamines can improve the drought resistance of plum seedlings by increasing the photosynthetic capacity and the contents of three kinds of free polyamines in leaves under drought stress.