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以“秋姬”李盆栽幼苗为试材,设置6个处理(CK、干旱(Dr.)、CK+亚精胺(Spd)、Dr.+Spd、Dr.+甲基乙二醛双脒基腙(MGBG)、Dr.+MGBG+Spd),重复3次,随机区组排列,通过喷布1mmol·L~(-1) Spd和1mmol·L~(-1) MGBG,研究了多胺及其合成抑制剂对旱胁迫下李幼苗叶片渗透调节物质含量和光合作用的影响。结果表明:旱胁迫下叶绿素总含量降低,多胺及其合成抑制剂可调节其叶绿素总含量。丙二醛(MDA)含量Dr.+Spd处理最高,Dr.+MGBG处理降低,Dr.+MGBG+Spd处理相对提高;可溶性糖和游离脯氨酸(Pro)含量也是如此;4个光合指标(净光合速率(Pn)、胞间CO2浓度(Ci)、气孔导度(Gs)和蒸腾速率(Tr))旱胁迫下均下降,经Dr.+Spd处理均提高,经Dr.+MGBG处理均下降,经Dr.+MGBG+Spd处理相对提高;其中,Gs经CK+Spd处理最大,与CK相比,Pn经CK+Spd处理下降较小,Ci、Tr经CK+Spd处理下降较大;多胺及其合成抑制剂可调节旱胁迫下李幼苗叶片叶绿素总含量、MDA含量、2种渗透调节物质(可溶性糖和游离Pro)含量和4个光合指标(Pn、Gs、Ci和Tr)的升降;在干旱条件下喷布Spd,有利于李树正常的生长发育。
A total of 6 treatments (CK, drought, CK + Spd, Dr. + Spd, Dr. (MGBG, Dr. + MGBG + Spd). The cells were randomly divided into three groups. Spraying 1 mmol·L -1 Spd and 1 mmol·L -1 MGBG, Effects of Synthetic Inhibitors on the Contents of Osmotic Adjusting Substances and Photosynthesis in Leaves of Plutella xylostella under Drought Stress. The results showed that total content of chlorophyll decreased under drought stress and polyamines and their synthetic inhibitors could regulate the total content of chlorophyll. The content of malondialdehyde (MDA) was the highest in the treatments of Dr. + Spd, the treatments of Dr. + MGBG were decreased, the treatments of Dr. + MGBG + Spd were relatively increased; the contents of soluble sugar and free proline were also the same; Pn, Ci, Stomatal conductance (Gs), and transpiration rate (Tr)) decreased under drought stress and both increased after treatment with Dr. + Spd (P <0.05). The Gs treated by CK + Spd was the largest. Compared with CK, Pn decreased little by CK + Spd and decreased by CK + Spd. Polyamines and their synthetic inhibitors could regulate the leaf chlorophyll content, MDA content, the content of two osmotic adjusting substances (soluble sugar and free Pro) and the photosynthetic parameters (Pn, Gs, Ci and Tr) under drought stress Ascending and descending; Spd in dry conditions Spd, is conducive to the normal growth and development of plum.