水稲の湛水土中直播栽培における出芽性の検定方法と遺伝的変異

日本作物学会紀事

吉田 智彦²  太田 久稔¹  井辺 時雄¹ 

[1] 農業技術研究機構;宇都宮大学

关键词: Gene stock;    遺伝資源;    Evaluating method;    検定方法;    Seedling emergence;    出芽苗立ち;    Rice;    水稲;    Direct seeding;    ç›´æ’­;    Submerged soil condition;    土中条件;   

DOI  :  10.1626/jcs.72.50

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

The seedling emergence of rice in direct seeding in submerged soil was investigated with respect to the degree of the forced sprouting, temperature and seedling depth. As a preliminary test, eight representative rice cultivars of various origin, i.e, Akihikari, Koshihikari, Kinuhikari, Akage, Akamai, Arborio, Lemont, and Habataki, were tested for emergence. The optimum condition for germination in the submerged soil was exposure to 25°C for 2∼3 days. Germinated seeds with 0.4∼1.4 mm coleoptiles were placed at 1cm, 2 cm and 3 cm depth under the submerged soil surface in a growth chamber kept at 15°C and 25°C. The seedling emergence widely varied genotypes when seeded at a 2 cm or 3 cm depth at 25°C and 1cm depth at 15°C. Then the emergence of 302 rice cultivars seeded at a 2 cm depth at 25°C was compared. Among them 59 (modern) and 104 (native) cultivars from Japan, 40 from China, 39 from Korea, 23 from Italy, 13 from America, 9 from India, 4 from Russia, and 11 from other countries. The rice cultivars from India, Sri Lanka, and Bangladesh showed a significantly lower percentage of emergence than those from Japan. These findings suggested that Indica type varieties had poor seedling emergence under a submerged soil condition.

【 授权许可】

Unknown