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Co~(60)r 射线照射夏谷不同品种的干种子,不同品种的植株的存活率随照射量的增加而降低,不同品种对 r 射线的敏感性分为三个类型,照射量每增加1万仑,存活率减少10%以上属敏感型;存活率减少5～10%属中间型;存活率减少5%以下属迟钝型,环境条件对 M_1敏感性的影响是存在的,栽培条件不同,同一品种存活率也不同,故试验应在水肥充足的土地上进行。Co~(60)r 射线对夏谷 M_2能产生矮秆、早熟和穗形等有益突变类型。夏谷突变频率与辐照品种本身基因型差异有关。r 射线能改变多种性状,从中选出综合性状好的植株来。不同照射量对各种品种产生有益突变频率是有差别的,夏谷1～4万仑照射有益突变发生的多。
Co ~ (60) r rays irradiate dry seeds of different varieties in summer and fall, the survival rate of different varieties of plants decreased with the increase of irradiation amount. The sensitivity of different varieties to r rays was divided into three types. Wan Lun, the survival rate of 10% or more is a sensitive type; 5 to 10% reduction in survival rate is an intermediate type; 5% reduction in survival rate is a dull type, the impact of environmental conditions on the M1 sensitivity exists, different cultivation conditions, The same species survival rate is also different, so the test should be sufficient water and fertilizer on the land. The Co ~ (60) r radiation can produce some useful mutation types such as dwarf, precocious and spike for Summer Valley M_2. The frequency of mutation in summer valley is related to the difference of genotypes of irradiated varieties. R rays can change a variety of traits, from the election of good traits of plants. There are differences in the frequency of beneficial mutation of different varieties of different doses, summer valley 1 to 4 Wan Lun irradiation beneficial mutations occur more.