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本实验简略分析了海带雌配子体的放射敏感性并初步测定了30天半致死量。 从这个实验材料的分析可以得到以下的初步结论: (1)X射线从50伦到500伦的剂量对于海带雌配子体在30天里没有什么可见的有害效应。 (2)X射线1000伦以上的剂量在30天里显著地增加了海带雌配子体的死亡率。4000伦以上的剂量从照射后的第二天起就有明显的致死效应。6000伦或稍多一点可以看做是30天的全致死量,2000伦左右是30天半致死量。 (3)照射各组和对照组的死亡率都在雌配子体排卵期前后大量激增。这有环境的和体内的原因。在体内原因方面,可能有一部分原因是由于海带自然种群是杂种,含有某些有害的隐性突变,X射线特别是高剂量X射线的照射可能引起细胞物质的变化,同时也可能引起某些有害的诱发突变。这些细胞物质的变化和突变在单倍体雌配子体的关键时期,可能容易发生有害的效应。
In this experiment, the radiosensitivity of female gametophyte of kelp was analyzed briefly and the semi-lethal dose of 30 days was preliminarily determined. The following preliminary conclusions can be drawn from the analysis of this experimental material: (1) The dose of x-rays from 50 to 500 was not significantly deleterious to the kelp female gametophyte over 30 days. (2) The dose above X-rays of 1000 lux significantly increased the mortality of the female gametophyte in 30 days. The dosage above 4000 Lunar had a significant lethal effect from the second day after irradiation. 6000 Lun or a little more can be seen as a 30-day total lethality, 2000 Lun is about 30 days lethal dose. (3) The mortality rate of irradiation group and control group all increased significantly before and after ovulation period of female gametophyte. There are environmental and physical reasons. In vivo causes may be due in part to the natural population of kelp is a hybrid, contains some of the deleterious hidden mutations, X-ray radiation, especially high doses of X-rays may cause changes in cellular material, but may also cause some harmful Of induced mutations. Changes and mutations in these cellular substances can be detrimental in the critical period of the haploid female gametophyte.