研究稻种资源,发掘耐冷材料,是耐冷育种工作的物质基础和首要环节。我们在考察各地品种耐冷性的基础上,于1976—1978年对云南和四川高寒山区的部分地方品种进行了耐冷性鉴定。现将1978年鉴定结果简报于后。供试品种52个。其中云南品种37个,四川品种9个,其他来源3个。对照种早粳科情3号,中粳沙州东方红,晚粳农虎6号。鉴定采用自然冷温定花观察法。为使花期遇上冷温并在同期比较,于4月29日、6月30日和7月14日分三期播种,均在播后1月单株移栽。在自然冷温来临期间,每日于盛花时刻选盛开稻穗,剪除未开和往日已开颖花,只留张开颖花,挂牌。各品种每日剪修2丛,次日带泥移至设有尼龙网保护的田内 Studying the resources of rice seeds and discovering the cold-tolerant materials are the material basis and primary links of cold-tolerant breeding. Based on the investigation of the cold tolerance of all varieties, we identified the cold tolerance of some landraces in Yunnan and Sichuan alpine areas from 1976 to 1978. Now 1978 results of the appraisal briefed later. Test varieties 52. There were 37 Yunnan varieties, 9 Sichuan varieties and 3 other sources. On the 3rd species of early japonica, Chinese red rice in Dongzhou red, late japonica on the 6th. Identification using natural cold set flower observation method. In order to meet the cold and flowering during the same period compared to April 29, June 30 and July 14 in three seeding, transplanting in January after sowing. During the natural cold and warm days, the daily bloom at full bloom choose blooming panicle, cut off the open and the past has been open-minded, leaving only Zhang open flowers, listing. Cultivars were trimmed 2 plies daily, and the next day the mud was moved to a field with nylon net protection