Growth and flowering responses of seed-propagated strawberry seedlings to different photoperiods in controlled environment chambers
Growth and flowering responses of seed-propagated strawberry seedlings to different photoperiods in controlled environment chambers
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受控环境室中草莓种子繁殖幼苗对不同光周期的生长和开花响应
DOI：
10.1016/j.scienta.2018.12.049
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发表时间：
2018
期刊：
影响因子：
1
通讯作者：
T.
中科院分区：
文献类型：
--
作者：
Tsuruyama J.;Shibuya;T.
植物对光的红远红比（R:FR）的响应已被研究过，但R:FR与其他因子之间的相互作用尚不清楚。本文研究了R:FR ×蒸汽压亏缺（VPD）对茎伸长和叶片伸长的影响。黄瓜（Cucumis sativus）幼苗萌发后在VPD为0.4或3.0 kPa、温度为28℃、R:FR为1.0或10的生长室内生长7 d。较低的R:FR和较低的VPD协同刺激茎伸长，可能是由于细胞壁延伸性和膨胀压力之间的相互作用，它们（分别）响应活性光敏色素比例和蒸发需求的变化。较低的R:FR +较低的VPD也能促进叶片扩张，但与茎伸长不同，较低的VPD降低了R:FR对叶片扩张的影响。这可能与茎叶之间的资源竞争有关：较低的R:FR和较低的VPD减少了叶片的光合分配。这可能会限制叶片扩张，从而缓和R:FR对叶片扩张的影响，尽管其他因素可能会刺激细胞扩展。
Plant responses to the red-to-far-red ratio (R:FR) of light have been investigated, but interaction between R:FR and other factors is less known. Here, we investigated the effects of R:FR × vapor-pressure deficit (VPD) on stem elongation and leaf expansion. Cucumber (Cucumis sativus) seedlings were grown in growth chambers at a VPD of 0.4 or 3.0 kPa, an air temperature of 28 °C, and an R:FR of 1.0 or 10 for 7 days after germination. Lower R:FR plus lower VPD synergistically stimulated stem elongation, likely owing to an interaction between cell-wall extensibility and turgor pressure, which (respectively) respond to changes in the proportion of active phytochrome and in evaporative demand. Leaf expansion was also stimulated at lower R:FR plus lower VPD, but unlike stem elongation, lower VPD reduced the effect of R:FR on leaf expansion. This may be explained by resource competition between stems and leaves: photosynthate allocation to leaves decreased under lower R:FR plus lower VPD. This may limit leaf expansion and thereby moderate the R:FR effect on leaf expansion, although additional factors may stimulate cell extension.