小麦の冷害に関する研究 : 第6報 長野県に発生した小麦の出穂時における凍害について

抄録

1. In 1964 there ocurred a wheat plant sterile phenomenon at high sterile rate of 70% at Narabara area in Nagano prefecture. 2. The frost-damaged wheat plants were, as compared with normal ones, characterized by such outward appearances as shortness in culm-height, withered leaf apex, yellowish spikes, non-flowering, dead ovaries, abnormal pollen, etc. 3. Based upon the fact-finding survey results, it was inferred that such sterile phenomenon was caused by the death of ovaries and abnomal pollen due to the attack by low temperature of -0.5°C in shelter temperarature at the earing stage. 4. The exactness of the above inference was evidenced by tests using a refrigerator, and it was also clarified that the causes for the occurrence of chilling injury and frost injury at the earing stage were just the same in essence, but different merely in the disparity between them in the degrees of temperatures at the earing stage.