The Physical Environment of Chloroplasts as Related to their Morphology and Activity in Vitro.
The Physical Environment of Chloroplasts as Related to their Morphology and Activity in Vitro.
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叶绿体的物理环境与其形态和体外活性有关。
DOI：
10.1104/pp.29.5.448
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发表时间：
1954
期刊：
影响因子：
7.4
通讯作者：
J. Mcclendon
中科院分区：
文献类型：
--
作者：
J. Mcclendon
梨叶片水分含量和水分亏缺的日波动。结果表明，在生长季节，以干重为基础计算的叶片含水量普遍减少。然而，结果还表明，这种减少是由于干物质含量的增加，而不是由于水成分的减少。梨叶片含水量最小和亏水最大值出现在每天下午2时左右。在每天凌晨2点左右观察到最大水分含量和最小水分亏缺。在生长季节的早期，叶片含水量的日极值之间的差异通常较大，特别是在叶片幼嫩和多肉的时候。这些极端现象似乎是由于干物质和水成分的反向变化。正如本研究的结果所表明的那样，由于叶片中的实际含水量可能会也可能不会伴随着计算叶片含水量的变化，因此，除非考虑到所涉及的各个成分的重量，否则术语“含水量”甚至“干重含水量”可能会有些误导。结果还表明，只有当叶片达到接近全尺寸时，水分亏缺变化才与环境条件有关。
and diurnal fluctuations in the water contents and water deficits of Bartlett pear leaves. The results indicated that there was a general reduction in the leaf water content, as calculated on a dry-weight basis, during the growing season. The results also indicated, however, that this reduction was caused by an increase in the dry matter content and not by a decrease in the water component. Minimum water contents and maximum water deficits of pear leaves were observed to occur around 2:00 P.M. each day. Maximum water contents and minimum water deficits were observed around 2:00 A.M. each day. The differences between the diurnal extremes of leaf water content were generally larger early in the growing season, particularly when the leaves were young and succulent. These extremes appeared to be due to inverse changes in both the dry matter and water components. Since the actual amount of water in a leaf may or may not accompany changes in calculated leaf water contents, as indicated by the results of this study, the term "water content" or even "water content on a dry-weight basis" may be somewhat misleading unless the weights of the individual components involved are also considered. The results also indicate that only after leaves reach nearly full size can water deficit changes be related to environmental conditions.