Water Relations and Dynamics of Tuber Growth Rate in Sweet Potato Plants (Ipomoea batatas Lam.)
Water Relations and Dynamics of Tuber Growth Rate in Sweet Potato Plants (Ipomoea batatas Lam.)
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甘薯植株水分关系和块茎生长速率动态（Ipomoea batatas Lam.）
DOI：
10.2525/ecb1963.36.91
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
H. Eguchi
中科院分区：
文献类型：
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作者：
Toshihiko Eguchi;M. Kitano;H. Eguchi
众所周知，碳汇器官不仅是碳的储存库，而且随着器官的生长还必须获得适当比例的水。利用新开发的块茎体积在线测量系统，对甘薯（Ipomoea batatas Lam.）块茎生长速率与水分关系进行了动态分析。黑暗条件下块茎生长速率高于光照条件下，且生长速率与叶片水势变化几乎平行。此外，块茎生长速率的瞬态响应正好发生在蒸发需求快速变化之后，即在关光、增湿或全叶切除后1 h，块茎生长速率急剧增加，而在开光或减湿后1 h，块茎生长速率急剧下降。因此，在叶片水势较高的条件下，块茎生长速率较高，并通过整个植株水分平衡受到叶片蒸腾作用的影响。（1997年9月1日收到）
It is known that the sink organ is not just a reservoir of carbon, but must also acquire water in appropriate proportion as the organ grows. In this study, the dynamics of tuber growth rate in sweet potato plants (Ipomoea batatas Lam.) was analyzed with reference to water relations using a newly developed system for on-line measurement of tuber volume. Tuber growth rate in the dark was higher than in the light, and the growth rate was almost parallel to the change in leaf water potential. Furthermore, transient responses of tuber growth rate were found just after rapid changes in evaporative demand, i.e. tuber growth rate drastically increased in 1 h after turning off the light, increasing humidity or excising all leaves, and the growth rate drastically decreased 1 h after turning on the light or decreasing humidity. Thus, the tuber growth rate was higher under higher leaf water potential, and it appeared to be affected by leaf transpiration through the whole plant water balance. (Received September 1, 1997)