On the Artificial Germination of Pollen in Rice Plants. : V. Effect of low temperature on pollen germination at different stages of primordial panicle development.

[摘要] In 1955, experiments were carried out to know how pollen germination may be affected by low temperature given at different stages of primordial panicle development, comparing with non-treated control. Pot cultured plants of variety "Norin-22" were exposed to low temperature of 17°C at 6 succeeding different stages of 6 days period during primordial panicle development. Fresh pollen taken from flowers of each treated plots were subjected to germination tests on starch paste medium. Results were summarized in Figure 1. According to the figure, we can find an appreciable reduction in pollen germination in the plot treated by low temperatures during the heading and the blooming stage (Plot F), compared with those in other plots, the differences being statistically significant at the one percent level. The plot treated during the reduction division stage (Plot D) showed also lower percentage of germination than other plots except Plot F, and these differences were proved to be significant at five percent level. While among other plots (Plot A, B, C, E and control) no difference was found in the germination percentage. The percentage of sterile glume was also measured with the same material plants in all plots. The percentage of sterile glume in Plot F was observed to be higher than those in other plots. Those in Plot D and E were next to that in Plot F, and most of the sterile glume in Plot D belonged to so called "Hakufu", whch means dead white coloured glume. Other plots except Plot D, E and F showed very few differences compared with the control.

[学科分类] 农业科学（综合）