水稻品種穗上發芽之變異性及其與休眠性關係之研究

Abstract

就182個水稻品種調查適應其穗上發芽性及休眠性在品種間之變異，並分析兩種性狀間之相關關係，其結果摘述如下： 1. 水稻穗上發芽性在品種間變異甚大，有51.7%之品種在抽穗後35天其穗上發芽率卽可達50%以上。 2. 依品種之原產地及水稻型別而言，原產菲律賓、斯里蘭卡及韓國之秈稻品種具有較強之穗上發芽抵抗性，而美國稻之抵抗性最弱，其他地區之品種介於兩者之間。一般具有強穗上發芽抵抗性之品種大多是秈稻。 3. 秈稻品種之穗上發芽性與其生育日數間有極顯著之正相關，但梗稻則成不明顯之負相關。果皮有色澤之品種一般具有強穗上發芽抵抗性。 A total of 182 varieties was investigated for the variability of pre-harvest sprouting, grain dormancy and the relationship between these two characters. The result are briefly summarized as follows: 1. The degree of pre-harvest sprouting varied with varieties. Of 182 entries, 94 (51.7%) showed 50 percent or more or pre-harvest sprouting at 35 days after heading. 2. When compared on the basis of original and varietal type, Indica varieties from Philippines, Sri Lanka and Korea appeared to have the highest resistence to pre-harvest sprouting whereas those from America had the lowest resistance, and the others ranked between the two groups. In general, the Indica varieties had higher resistance to pre-harvest sprouting.