Pseudostem Length as an Indicator of the Start of Internode Elongation in Spring and Winter Wheat Cultivars

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  • 春播性および秋播性の小麦品種における節間伸長開始期の指標としての偽茎長

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Abstract

To develop an indicator of the start of internode elongation in wheat (Triticum aestivum L.) in the warmer regions of Japan, we analyzed the relationships between apical development stage, stem length, and pseudostem length (from the ground to the lamina joint of the uppermost unfolded leaf) in five spring and winter cultivars in the warmer Tokai region of Japan. The time course of apical development differed among cultivars: the winter cultivars reached the double ridges stage (the transition from vegetative to reproductive development) and the following floret differentiation stage later than the spring cultivars in early sowing. Apical development stage was closely related to both stem length and pseudostem length. Internode elongation started at the floret differentiation stage in all cultivars, when the pseudostem length was ca. 5 cm in all cultivars. The present study indicated that pseudostem length is useful as an indicator of the start of internode elongation in wheat cultivation in the warmer regions of Japan.

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