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为揭示青杨(Populus cathayana)雌雄幼苗对淹水胁迫的适应性,在实验地内通过土培盆栽淹水方式从植株生理生态和生长发育方面探讨淹水胁迫对青杨扦插苗的影响。试验分为对照和淹水2个处理,处理时间为40天。结果显示:(1)淹水胁迫导致青杨幼苗叶片中的丙二醛(MDA)含量和茎部淹水区的不定根数显著升高,植株的净光合速率(Pn)、叶绿素含量、超氧化物歧化酶(SOD)活性、株高、基径、总叶面积、比叶面积(SLA)、根生物量、叶生物量、茎生物量、总生物量干重和根冠比(R/S)显著降低。(2)与雄株相比,淹水胁迫显著增加了雌株幼苗的MDA含量,降低了SOD活性、Pn、类胡萝卜素(Caro)含量、叶绿素a/b、SLA、根生物量和R/S,并导致雄株在淹水胁迫下具有比雌株更高的气孔导度(Gs)、胞间CO2浓度(Ci)、蒸腾速率(Tr)、不定根数和株高。可见,淹水胁迫对青杨雌雄幼苗的形态生长和生理过程均有严重的抑制作用,但表现出显著的性别间差异。雄株可以通过维持更高的光合作用能力和增加不定根数量来维持植株的生长,从而表现出比雌株更强的抗逆性。
In order to reveal the adaptability of male and female Populus cathayana plants to flooding stress, the effects of waterlogging stress on Populus cathayana seedlings were discussed in the aspects of plant physiology, ecology and growth by soil-potted flooding method. The experiment was divided into control and flooding two treatments, the treatment time was 40 days. The results showed that: (1) The content of malondialdehyde (MDA) and the number of adventitious roots in the stem flooding area were significantly increased under waterlogging stress. The net photosynthetic rate (Pn), chlorophyll content, The activities of SOD, plant height, root diameter, total leaf area, specific leaf area (SLA), root biomass, leaf biomass, stem biomass, total biomass dry weight and R / S ) Significantly reduced. (2) Compared with male plants, flooding stress significantly increased MDA content and decreased SOD activity, Pn, Caro content, chlorophyll a / b, SLA, root biomass and R / S, and resulted in higher stomatal conductance (Gs), intercellular CO2 concentration (Ci), transpiration rate (Tr), adventitious roots and plant height of male plants under waterlogging stress than those of female plants. It can be seen that the waterlogging stress has a serious inhibitory effect on the morphological and physiological processes of the male and female poplar plants, but shows significant gender differences. Male plants can maintain plant growth by maintaining higher photosynthetic capacity and increase the number of adventitious roots, thus showing stronger resistance than female plants.