Studies on the Characteristics of the Physiologlcal Function of Leaf at Definite Position on Stem of Rice Plant (Part 1) : Morphological Characterstics of the Development of Leaf at Definite Position in Relation to the Growth of Whole Plant

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  • 葉位別に見た水稲葉の生理機能の特性及びその意義に関する研究 : (第1報) 生育に伴う各葉の形態的変遷
  • 葉位別に見た水稲葉の生理機能の特性及びその意義に関する研究-1-
  • ヨウイ ベツ ニ ミタ ミズ イナバ ノ セイリ キノウ ノ トクセイ オヨビ ソノ イギ ニ カンスル ケンキュウ 1

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The writer has studied on the life history of rice plant from the view point of nutrio-physiology. In these studies, the rice plants were treated as a whole plant. But this whole plant is constructed from many tillers and these tillers are constructed from many leaves. So, the macroscopic studies in which plants are treated as a whole, have only quantitative meaning. If it is desired to know the physiological condition of the rice plant at any stage of growth qualitatively, analytical studies must be made in which the many parts that make up the whole plant are dealt with. So, the writer of this paper studied morphological characteritics of development of leaves on mainstem a definite positions. The following results were obtained. (1) Leaf-length reflects the environmental condition under which the leaf developed. (2) Ratio of leaf-blade-length to leaf-sheath-length of upper leaves is larger than that of lower, except the boot leaf. (3) Lower leaves grow first and then the upper ones grow successively. The longevity of upper leaves is greater than that of lower. (4) Proportion of materials which can translocate from leaf to another part in relation to total leaf weight is larger in upper leaves than in lower. These facts suggest that each definite leaf has its characteristics of the physiological function corresponding to its position on stem.

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