Sterile Spikelets of Rice Plants Induced by Low Temperature in 1988 : Difference in heading date among stems and spikelet locations on the panicle

Japanese Journal of Crop Science

Eiki KURODA¹  Kazuo HONJYO¹  Mitsugu HIRANO¹ 

关键词: Heading date;    主茎;    Main stem;    出穂日;    Rice plants;    水稲;    Spikelet locations on the panicle;    低温感受性;    Sterility;    不稔;    Susceptibility to low temperature;    分げつ;    Tiller;    穂上位置;   

DOI  :  10.1626/jcs.60.213

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

A large number of sterile spikelets were induced by low-temperature at the booting stage of rice plants during the middle to the end of July in 1988. The authors investigated various aspects of occurrence of sterile spikelets and the difference in fertility percentage of spikelets at different sites on the panicle with reference to the difference in heading date among tillers. The difference in heading date between the main stem and the tillers and varietal differences of them were studied by investigating whole stems of planted hills in paddy fields. There was a large varietal difference in the heading date among whole stems on a hill. The difference in heading date between the main stem and each primary tiller in the individual rice plants was divided into the 3 classes. (1) The tillers originating from 4th to 6th main stem nodes (middle tillers) headed earlier than the main stem, and the heading in tillers originating from 2nd and 3rd main stem nodes (lower tillers) delayed ; (2) The heading in the main stem and middle tillers was almost the same, and lower tillers headed later ; (3) The whole primary tillers headed later than the main stem, and the heading in the lower and upper tillers significantly delayed. The fertility percentage significantly varied according to slight differences in heading date, and the individual stems at the same heading date showed great variation in fertility percentage. However, an obvious difference in fertility between the spikelets on the main stems and the tillers was not observed. There were 2 types of spikelet fertility pattern ; i. e. 1) the spikelets located on the upper part of panicle showed the lowest fertility and fertility increased foward the down part of the panicle and 2) little variation in fertility was found according to the spikelet locations on the panicle. Furthermore, fertility percentage of spikelets at each Location on the panicle was almost equivalent between the main stems and the tillers. From the above results, we concluded that the difference in fertility due to different locations on the panicle was influenced by the difference in the developmental stage of spikelets at different locations on the panicle and that it was closely correlated with the difference in susceptibility to low temperature among spikelets on the panicle.

【 授权许可】

Unknown