アジア稲の浮稲と祖先野生種における節間伸長性の比較

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タイトル別名
  • Comparison of Internodal Elongation between Asian Deepwater Rice and Its Wild Relatives.
  • アジア稲と浮稲と祖先野性種における節間伸長性の比較〔英文〕
  • アジア イネ ト ウキイネ ト ソセン ヤセイシュ ニ オケル セッカン シン

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Using 747 varieties of Asian deepwater rice (Oryza sativa) and 112 strains of wild rice including O.rufipogon. O, nivara, and their intermediates, the position of the lowest elongated internode (LEI) and the elongation ability under rising water conditions at a rate of 2 cm and 4 cm per day were examined. The wild rice strains were distinguishable as both erect and creeping strains at the 8th leaf stage and both types were equally frequent. When creeping seedlings were submerged in water, even the seedling with most creeping growth stood nearly erect at around five days after submerging treatment. The average LEI position was about one internode higher in the wild rice, while in the creeping wild rice it was one internode higher than in the erect type. The range of the LEI position among the wild rice strains was nearly the same with that among the deepwater rice varieties. These results show that the age at which plants begin to elongate their internodes seems to be nearly the same between the both rices. Under rising water conditions, on the contrary, elongation ability of most wild rice strains was inferior to that of deepwater rice. In wild rice strains with poor elongation ability, both length of leaf sheath and leaf blade and/or each internode length was shorter than in the deepwater rice.

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