栽培大麦辐射敏感性与进化的关系

STUDIES ON RELATIONSHIP BETWEEN THE RADIOSENSITIVITY AND EVOLUTION OF CULTIVATED BARLEY BY PEROXIDASE ISOZYME ANALYSIS

大麦幼苗组织的过氧化物酶同工酶有3个酶带区,8条酶带。辐照后,在偏负极端出现一个新的酶带区,增加1—3条酶带。辐射剂量效应可用线性回归方程Y=A+BX拟合。大麦品种的过氧化物酶同工酶变化与辐射敏感性有关,与进化类型直接相关。协方差分析表明,裸大麦对辐射的敏感性显著高于皮大麦,四棱和六棱大麦则显著高于二棱大麦。据此可以认为,在进化上属原始类型的品种,辐射敏感性较低。

Radibsensitivity of cultivated barley in relation to its evolution was studied by means of peroxidase isozyme analysis.The results showed that three zones with eight bands of peroxidase isozyme were observed in the seedling tissue of barley.A great change took place in the zymog-ram number of peroxidase isozyme after barley seeds were irradiated with gamma-rays.A new zone of zymogram with increase from one to three bands was.found near the negative end.Irradiation dose effect on zymogram numbers could be expressed by a linear regressive equation as Y=A+BX It was also observed that the radiosensitivity differed from one cultivar to another,and the difference of radiosensitivity was associated with evolution.Compared with the hulled barley,the naked barley was much more sensitive to irradiation treatment.The radiosen-sitivities of four-row and six-row barley were significantly higher than that of two-row one.It could be concluded that the radiosensitivity of primitively evolved types of barley such as hulled barley and two-row one was lower