Reaction of Rice Varieties to Winter Hardiness

Abstract

The reaction of rice varieties to winter hardiness was evaluated in the first crop of 1970 at the Chiayi Agricultural Experiment Station. The winter survival of young rice plants in the dry nursery indicated that japonica varieties were more resistant to winter injury than indica varieties. Varieties developed at or native of Taiwan showed better survival from winter killing than those from tropical regions of the United States, Philippines, and India. Visual estimates of chlorosis on rice seedlings in the ordinary wet nursery showed that varieties of poor winter survival generally developed severe chlorosis. Reaction of heterogenous populations were usually intermediate between those of the parents or components involved.

嘉義農試驗所分所於民國五十九年笫一期水稻品種之耐寒性反應做初步之觀察。旱田直播區之幼小稻株越冬生存率顯示日本型水稻品種之耐寒性一般均較印度型為強，臺灣在來品種或在臺灣育成之水稻品種，其生存率均較來自美國、菲律賓及印度等熱帶地區之水稻品種為高。以目測方法所得秧苗葉色之黃化程度顯示越冬生存率低之品種，其葉色黃化現象亦較嚴重。雜質水稻集團之耐寒性反應大致位居兩純系親本或構成分子之中間。