ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

With the aim to investigate the physiological mechanism of tobacco response to molybdenum stress, the effect of photosynthetic pigment, gas exchange parameters,，chlorophyll fluorescence parameters and chloroplast ultrastructure of tobacco were studied under molybdenum deficiency stress by the hydroponic experiment. The results showed that, compared with the control group, the photosynthetic pigment contents and net photosynthetic rate of tobacco leaves cultivated about 10d decreased， while intercellular CO2 concentration, stomatal conductance and transpiration rate increased. And the initial fluorescence and non-photochemical quenching coefficient (NPQ) of PS II increased, while photosynthetic electron transport rate (ETR) and the maximal photochemical efficiency decreased,，but the differences between two treatments were not significant. The grana layer of the chloroplast ultrastructure under molybdenum deficiency stress expanded to deformation and loose，the number of amyloid was less and it grew worse. The most indicators between molybdenum deficiency and control tobacco cultivated about 20d were significant. In addition to Tr, other indexes between molybdenum deficiency and control tobacco cultivated about 30d were significant,， and the chloroplast under the molybdenum deficiency stress was damaged seriously. Therefore,，under the molybdenum deficiency stress，the chloroplast ultrastructure grows worse, the activity of PS II is inhibited, and the Pn decreases. With the extension of molybdenum stress time, the deficiency reaction is more obvious.