Morphological Traits on the Standard Type and Less-leaf Type of Rice

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  • 水稲主稈葉数の標準型および減葉型における形態的特性
  • スイトウシュカンヨウスウ ノ ヒョウジュンガタ オヨビ ゲン ヨウガタ ニ オケル ケイタイテキ トクセイ

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Abstract

We conducted pot experiments using three rice cultivars, Nipponbare, Koshihikari and Takanari in the net house at Setagaya Campus of Tokyo University of Agriculture in 2009. Twenty plants per pot were circular-dense-transplanted, and harvested at maturity to investigate the total leaf number on the main culms, and the lengths of panicle, leaf blades, leaf sheaths and internodes. We also researched the heading time, and the effects of nitrogen top-dressing and shading in the base of culms during the panicle development stage on the lengths of organs. Two types of the total leaf number on the main culms were confirmed. One was the standard type, and the other was the less-leaf type. Most of the culms were standard type in Nipponbare, and Koshihikari, but the culms of Takanari was divided into two types. There were clear differences in characteristics between the standard type and the less-leaf type, especially in Takanari. Less-leaf type culms tended to be longer in upper leaves and shorter in lower internodes than standard type culms. However, the effects of nitrogen top-dressing and shading on lengths of organs were likely to be roughly constant through cultivars or leaf number types. These results suggest that we need not control internode elongation with the consideration of leaf number types.

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