Characteristics Relating Young Panicle Development and Heading of Closely Related Calrose Rice Genotypes

Japanese Journal of Crop Science

Akio MATSUZAKI¹  J.Neil RUTGER¹ 

关键词: Distance between collars;    主稈;    Heading date;    出穂日;    Leaf number index;    分げつ;    Main culm;    葉耳間長;    Tillers panicle;    幼穂長;    Young panicle length;    葉齢指数;   

DOI  :  10.1626/jcs.60.298

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Seven near-isogenic lines which were derived from rice cultivar "Calrose" were sown on June 8, 1985, and transplanted on June 25 at the fourth leaf stage in rice facility of the University of California, Davis. Each plant was marked by a felt pen on every even leaf of main culm to count the number of flag leaf. At leaf number index (LNI) 85 to 95, young panicle length was investigated. At heading stage, all panicles of about 50 plants per genotype were dated their heading date on their flag leaf, and at harvest each panicle was recorded its node location from which it emerged. A high correlation coefficient between LNI and logarithm of young panicle length was obtained in all genotypes, so it was considered that LNI was an excellent index to estimate young panicle developmental stage, when the total number of leaves of genotype was known already. In ES-201, panicle of main culm and tillers headed nearly the same time, whereas in the other 6 genotypes, heading date of main culm was later than that of the first headed tiller panicle. Especially main culm heading of S-201 was delayed more than 2 weeks than that of the first headed tiller panicle. Primary tiller which emerged from 6th node on main culm headed at first in the genotype excluding ES-201. As the 6 genotypes other than ES-201 showed the most advanced young panicles in their 6th node at LNI 85 to 95, above-mentioned behavior seems to bc a characteristic of these genotypes. Heading date of main culm in M- 302 and S- 201 was prolonged by low temperature compared to that of Calrose 76 and M7, respectively. This might be based on their tolerance to low temperature for the uppermost internode elongation. An early heading genotypes showed less number of flag leaf (M-101) or higher leaf emergence rate (ES-201) than that of later ones (M7 and S-201), respectively.

【 授权许可】

Unknown