Relationship between Seedling Emergence Rate and Embryo Weight of Rice under Low-Temperature and Submerged Soil Condition.

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  • 低温・湛水土壌中下でのイネの出芽速度とはい重の関係
  • 低温・湛水土壌中下でのイネの出芽速度と胚重の関係
  • テイオン タンスイ ドジョウ チュウ カ デ ノ イネ ノ シュツガ ソクド

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Abstract

Rapid seed germination and higher seedling emergence under low-temperature and submerged soil conditions are desirable to stabilize the direct seeding cultivation of rice in temperate regions. This study was conducted to clarify the mechanism of relationship between embryo weight and seedling emergence rate in submerged soil at 18°C. The results were asfollows:Sixty-five percent of 158 rice cultivars (Oryza sativa L.) showed a higher emergence percent than 25%. Rice cultivars, which did not reach 25% emergence were mainly indica and upland rice cultivars. The averagefrequency distribution of the emergence coefficient was 0.8 in indica and 5.5 in japonica. A wide range of variation for embryo weight was observedin both groups. The range of embryo weight was 0.28-0.76mg in indica and 0.41-0.81mg in japonica. There was no significant correlation between embryo weight and emergence coefficient for the 158 rice cultivars under submerged soil conditions at 18°C. The seedling emergence of cv. Norin 6 and cv. Joshu were good under submerged soil conditions at 18°C, even though their embryo weights were light. Small embryo size with better emergence could be a suitable condition for breeding a rice cultivar with better quality. Onthe other hand, the embryo weight of one cultivar, Koshihikari, which was harvested on variable planting dates and ratoon crop ranged from 0.53 to 0.71 mg. There was no significant correlation between embryo weight and emergence coefficient of cv. Koshihikari. This result may indicate that emergence in submerged soil conditions at 18°C is regulated by some factor related to early growth rate than embryo weitht.

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