7. イネ穂ばらみ期及び開花期における障害型耐冷性(セミナー「低温環境への植物の適応-基礎と応用」)

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概要

• 論文の詳細を見る

• In the northern part of Japan, cool-weather damage in rice production is very severe in climate damages. And it has occurred about 25 times during the past century (once every 4 years on an average) in Hokkaido. Rice plants has 2 types of cool-weather damage; delayed growth type and destructive sterile one. Between them, it is very important for the latter to solve physiological mechanism to cool stress and to establish the countermeasures for conquering cool-weather damage. Destructive sterility to cool stress mainly suffer the damage at booting stage and flowering one during pollen developmental process. The most sensitive stage, the trough in fertility curve to cool stress at booting stage is the early microspore stage from tetrad to early microspore phase. And the next sensitive stage is just before pollen germination at flowering stage. At booting stage, the decrease of pollen number per anther to the stress is closely related to the sterility. Pollen activity to the stress, however, is not clear to the tolerance. At flowering stage, the cool tolerance is influenced after decision of pollen number in an anther. So, one of the important reaction to coolness is the abnormal digestion of starch to sucrose just before the germination of the pollens. Besides pollen differentiation and development mechanism, it is necessary for more strong cool tolerance to solve the mechanism of fertilization on the stigma, and more stable and higher in-vitro germination because of very short longevity of rice pollens.

• 低温生物工学会の論文
• 1996-07-28

著者

• 刈屋 国男

  農林水産省北海道農業試験場

関連論文

• イネの小胞子初期冷温処理による雄性不稔 : 第28報 新水管理法による冷害防止
• イネの小胞子初期冷温処理による雄性不稔 : 第27報 不稔発生に対する前歴水温および前歴窒素の効果
• 7. イネ穂ばらみ期及び開花期における障害型耐冷性(セミナー「低温環境への植物の適応-基礎と応用」)
• イネの開花期冷温処理による不稔 : 第3報 花粉の人工発芽法の確立

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