イネの茎葉生育の規則性に関する発育形態学研究 : 第1報 同一栽培条件下で総葉数を異にした主稈の生育型について

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概要

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• Even when rice seedlings with uniform size and age were planted as the singling in each pot containing the same amounts of nutrients and were precisely cultured at outdoor, a difference of one leaf frequently appeared in the total leaf number of the main shoots, one had N leaves and the other N-1 leaves. It is already known that the difference is a kind of individual variation. However, morphological aspects of the difference are not yet clearly demonstrated. Morphology of the main shoots were compared between the plant group having N leaves and that with N-1 leaves in total leaf number on the main stems. Morphological characters analyzed were the changes in the length of leaf laminae, leaf sheaths and elongated internodes successively developed on the main stems. Morphological variations based on the changes were clearly revealed inter groups but not intra groups (Figs, 1 and 2). The variations inter groups as follows. 1) Although the change in successive lamina length resembled in both groups up to the N-1 leaf position on the stem, the flag leaf lamina of N leaf group is conspicuously shorter than that of N-1 leaf group. 2) Although the change in successive sheath length resembled in both groups up to the N-2 leaf position on the stem, a quite different pattern was shown at the leaf positions more than N-2 leaf 3 on the stem. 3) The successive internode length on the main stem with N-1 leaves, which had five elongated internodes, linearly increased. The main stem with N leaves had six elongated inter-nodes. Culm length of the main stem was relatively greater in N-1 leaf group than N-1 leaf group. However, the length of each two successive internodes in upper positions was relatively greater in N-1 leaf group than N leaf group. Two different morphological types, which are indicated by the above-mentioned characters can be regared as a kind of "growth type". These two growth types are responsible for the variation shown at the total leaf number on the main stem under this experiment precisely cultured, and they occur within single cultivars assumed to be a "pure line". Even these types appeared in the precisely culture condition, therefore they seems to be present in the culture condition of conventional breeding experiment.

• 日本作物学会の論文
• 1987-09-05

著者

• 松葉 捷也

  北陸農業試験場

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