74—69是通过Co~(60)—γ射线辐照湘苎一号自交种子,从其后代群体中选出优良单株,经过多年培育而成的新品种。1987～1989年连续三年的区域试验结果表明,平均比对照芦竹青增产39.2％,三季麻平均纤维支数为1900支左右,比对照芦竹青高出100支以上,达到纺织高档产品的要求。该品种属深根丛生型,在长江流域麻区表现为中熟,三季麻工艺生长天数平均为65天。且具有较强的抗旱、抗苎麻根腐线虫病、炭疽病特性。诱变生理生化研究表明,74—69与诱变亲本湘苎一号存在着过氧化物酶酶量和酶谱带多少的差异。 74-69 is a new variety of excellent single plant selected from the progenies of Cole (60) -γ-ray irradiated Xiangzhu I-1 after years of cultivation. From 1987 to 1989 for three consecutive years of regional test results showed that the average increase of 39.2% compared with the control Arundo donax, the average number of three-season flax about 1,900 branches, more than 100 control Luzhqing higher than the high-end textile products Claim. The species is a deep root clustered, showing the area in the Yangtze River Valley maturity, the three season Ma technology growth days average of 65 days. And has a strong drought, anti-ramie nematode disease, anthracnose characteristics. Mutagenesis Physiological and biochemical studies have shown that there is a difference in the amount of peroxidase enzyme and zymogram bands between the 74-69 and the mutagenized Xiang Limo-1.