Studies on the improvement of culm stiffness for lodging resistance in rice (Oryza sativa L.)
1998
Yagi, T. (Hokuriku National Agricultural Experiment Station, Joetsu, Niigata (Japan))
The culm stiffness and its related traits of rice (Oryza sativa L.) were examined in order to improve the lodging resistance. 1) To elucidate the varietal difference in the lodging resistance, the culm stiffness and its related traits were discussed. The culm type index, the ratio of external diameter of basal culm to the culm length, was a good measurement of the morphological culm stiffness. The dry weight increment at basal culm, the ratoon number and the basal culm vigor can be used for an appropriate measurement of the physiological culm stiffness. The culm type index, the basal culm vigor and the ratoon number had high values of heritability, and the genetic correlations between the culm type index and the basal culm vigor or the ratoon number were low. So it is concluded that the association of the culm type index and the ratoon number may produce some filial plants which have superior culm stiffness over their parents. A yield potential test of five elite rice lines derived from the 'Toyonishiki' X 'Inabawase' cross was conducted to evaluate the lodging resistance. These pedigree lines showed less lodging than their parents. The proposal target to breed the stronger lodging resistant pedigrees than their parents has been attained
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