盐胁迫对黄瓜幼苗叶片光合色素含量的影响

采用营养液水培,选用耐盐性不同的黄瓜品种“长春密刺”和“津春2号”,研究了不同浓度(0、25、50、75、100 mmol/L)NaC l处理对黄瓜幼苗植株功能叶片、下位叶片中叶绿素(chl)含量和类胡萝卜素(car)含量的影响。结果表明,在盐胁迫下,黄瓜幼苗功能叶片中chla、chlb、chl、car含量在盐胁迫1 d后开始升高,3 d、5 d时达到最大值,且含量随着NaC l浓度的增加而增加,7 d、9 d时下降;“长春密刺”chl和car含量升高较早,但升高幅度明显低于“津春2号;”car/chl值下降,且“津春2号”下降幅度明显大于“长春密刺”。盐胁迫下,黄瓜幼苗下位叶片中chl总量和car含量下降幅度明显大于对照。

Effects of NaCl Stress on the Content of Photosynthetic Pigments in the Leaves of Cucumber (Cucumis sativus L.) Seedlings

The effects of different NaCl levels(0,25,50,75, 100 mmol/L) on the contents of chlorophyll and carotenoid in the leaves of two cucumber cultivars(Cucumis sativus L.cv.'Changchun Mici' and 'Jinchun No.2') seedlings with different salt tolerance grown hydroponically were investigated.The results showed that the contents of chlorophyll a,chlorophyll b,total chlorophyll and carotenoid in the upper leaves of the two cucumber cultivars' seedlings began to increase after 1 day of exposure to salt,and reached their peaks on the 3rd day or 5th day under saline stress,and their contents increased with increasing salinity at the same time,then declined on the 7th day or the 9th day of exposure to salt.For the salt resistant cv.'Changchun Mici',the contents of chlorophyll and carotenoid increased earlier than those of the salt sensitive cv.'Jinchun No.2',however,the magnitudes of such increase were less as compared to the latter cultivar.In addition,car/chl ratio declined in the leaves of salt treated seedlings,and showed larger reduction in cv.'Jinchun No.2' than cv.'Changchun Mici'.In the lower leaves of cucumber seedlings subjected to salinity,the contents of the total chlorophyll and carotenoid reduced more than the control plants.