Development of a Simple Testing Method for Cool Weather Tolerance at the Flowering Stage of Rice Using an Air Conditioned Room

Japanese Journal of Crop Science

Hisashi TANNO¹  Yuji HIRAYAMA¹  Harumi KIKUCHI¹  Hitoshi KIUCHI¹ 

关键词: Air conditioned room;    稲;    Cool weather tolerance;    開花期耐冷性;    Flowering stage;    検定法;    Rice;    人工気象室;    Test method;   

DOI  :  10.1626/jcs.69.43

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

We report a simple method devised for testing the cool weather tolerance at the flowering stage in rice. In small square pots, 15 cm in length, 5 cm in width and 10 cm in height, eight plants having only the main culms were cultivated. The temperature was constantly kept at 17.5°C for 15 days in an air conditioned room with 50% shading. The tolerance to cool weather damage was estimated from the fertility percentage of panicles which headed at the day when the low temperature treatment was started. At least 10 panicles (3∼4 pots) were needed to classify the varieties into 7 ranks, from extremely high tolerance to extremely vulnerable, with statistical errors of ±0.8 rank. In this method, the treatment starting at the heading day caused the lowest fertility percentage in almost all varieties. Therefore, fertility percentage could be determined using fewer panicles compared with the 8-day treatment at 15°C. There was a significant positive correlation (r=0.808**, n=14) between the results obtained by this method in different years. The results obtained by this method showed significant positive correlations with those obtained by the 8-day treatment method at 15°C and 6-day treatment method at 12°C (r=0.750** and 0.802**, respectively, n=14). Although the plants examined by this method were very small, there was a significant positive correlation (r=0.922**, n=8) between the results obtained using these small plants and the plants cultivated in a 1 / 5000a pot, which were similar in size to those in the paddy field.

【 授权许可】

Unknown