γ射线慢照射大豆苗期植株的效果

FFECT OF γ-RAYS CHRONIC IRRADIATION ON SOYBEAN PLANTS AT VE-V1 STAGE

本文用６０Ｃｏγ射线慢照射大豆苗期植株，研究其效果。结果表明，慢照射对Ｍ１代（当代）大豆植株的生长发育和籽粒产量有明显的抑制作用，不同剂量，以及同一剂量的不同剂量率间，对株高，每株英数，叶片的长宽比等性状的影响不同。而且出现种子急性照射从未有过的变化，如出现１、２、４小叶的复叶，２个以上的多生长点。Ｍ２代幼苗出现１片、３片真叶或子叶，且子叶连体或皱折。小剂量率的辐射效果大于大剂量率。苗期惺照射可以引起大豆后代籽粒蛋白质含量的突变，如９１－４４０４的蛋白质含量达５０．０２％，较原材料增加３％。

The effect of chronic irradiation on soybean seedlings was studied.The results showedthat under 30Gy and 50Gy with the dose rate of 0.0146,0.0051 per min respectively,the chronic irradiation evidently inhibited the growth,development and seed yield of soybean。Some variations which had never been seen appeared,In M1 generatiou one or threeleafletswere observed frequently. In M2 generation,one or three cotyledens and unifoliolateleaf of soybean plants were observed at seedling stage。some seedling were stunted with crin-kled or linkded cotyledens,Tbe results also indicated that the dose rate of 0.0051Gy per min had higher irradiation effect tban the dose rate of 0.0146Gy per min in same dose level。Chronic irradiation at VE-V1(emergence-first node)stage could induce genetic muation onprotein content of soybean seeds.A mutant with 50.02 percent of protein was selected fromprogenies of M5 generation treated with dose of 50Gy。