马铃薯遮光处理的效应研究

【研究目的】研究探讨了在马铃薯不同生长阶段的光处理效应,净光合速率(Pn)与蒸腾速率(Tr)、气孔导度(Gs)、胞间间隙CO2浓度(CO2)、叶面温度(Tleaf)、叶绿素含量、光强(PAR)的变化情况及相互关系,植株体上、中、下层叶片对光合作用的贡献情况。【研究方法】采用两种类型的遮阳网遮光,设2个水平、4个时期,一个对照,共9个处理。【结果】块茎形成膨大期遮光,40%、65%透光率细胞间隙CO2浓度降低,蒸腾速率较对照下降,气孔导度、结薯数、商品薯率、叶绿素含量升高,产量较对照增产显著;苗期遮光对产量的影响不大,但延迟生殖生长;淀粉积累期遮光增产不显著;全生育期65%透光率减产,40%透光率减产显著。遮光植株茎杆细长,自然光照则粗壮。【结论】块茎形成膨大期遮光有利于块茎形成。

Study on Photosynthesis Effect of Shading Potato Light

OBJECTIVE] The photosynthesis effect of shading light on different growth potato phase was discussed in the paper, including the change and relationship of net photosynthesis (Pn), transpiration (Tr), stomatal conductance (Gs), internal CO2 (CO2), temperature of leaf (Tleaf), chlorophyll content, the contribution of photosynthesis to the upper level position leaf, middle level position leaf, lower level position leaf. METHOD] Two ways were adopt in the experiment of shading potato. Nine treatments were made up of two levels and four terms, additional one CK. RESULTS] During the potato bulging phase, the rate of 40%, 65% light permeation conduce to depress internal CO2, transpiration is lower than CK too. On the contrary, photosynthesis (Pn), stomatal conductance (Gs), seeding amount of potato, commodity rate potato, chlorophyll content boosted. Shading potato in seedling phase does not have much effect, it just delays the time of procreation. Shading potato does not have obvious effect when the starch accumulates. The rate of 65% light permeation decreases production. The rate of 40% light permeation decreases production obviously. Shading potato causes stem becoming slim, while stem is stronger enough under natural condition. CONCLUSION] Production of potato benefits from shading potato during the potato bulging phase.