作物の形質発現の変動性よりみた収量安定性に関する研究-3-水稲の品種変遷に伴う諸形質の個体内変動性の推移について

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  • 作物の形質発現の変動性よりみた収量安定性に関する研究 III : 水稲の品種変遷に伴う諸形質の個体内変動性の推移について(農学部門)
  • サクモツ ノ ケイシツ ハツゲン ノ ヘンドウセイ ヨリ ミタ シュウリョウ
  • Studies on the yield stability viewed from the point of character manifestation variability of crops III : Change in several characters variabilities occured within a plant with the varietal transition in rice (Agriculture)

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Abstract

From the point of view that the variability which occures among culms or panicles contained within a plant (Within CV) must have had changed in some connection with the change of character manifestation (character value), although it had not been treated as an object of selection, the changes in the variabilities of several characters in rice were investigated. Six recent leading varieties and their twenty-eight ancestral varieties were cultured in 1976. In general, Within CV of all the characters examined increased according as the genealogies proceeded from the varieties which had been bred in old times to recent varieties, whereas character values decreased. Namely, character manifestations and the variabilities occuring within a plant had changed to the reverse direction to each other and the recent varieties showed the shorter culms, smaller panicles and lager variabilities occuring within a plant than those of mean values of all the varieties tested.

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