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本试验分别用同样剂量率(128r/分)、不同照射剂量的 Co~(60)-r射线照射休眠茶籽(0、3、6、9、12、15kr)、萌发茶籽(0、1.5、3.0、4.5、6.0、7.5kr),经过一年的田间调查观察,发现出苗期随照射剂量的加大而推迟。3kr处理推迟 20～30天;6kr处理推迟50～100天。出苗率随剂量的加大而降低。形态变异率在临界剂量(LD40)的范围内随剂量的加大而增加。适宜照射剂量(LD50):休眠茶籽3～6kr;萌发茶籽在3kr左右。致死剂量(LD100):休眠茶籽在6～9kr之间;萌发茶籽在4.5kr以上。在照射当年地上部的生长势随剂量的加大而减弱,但与对照相比3kr处理无显著差异,6kr差异极显著(a=0.001)。
In this experiment, dormant tea seeds (0, 3, 6, 9, 12 and 15kr) were irradiated with Co ~ (60) -r radiation with the same dose rate (128r / , 3.0,4.5,6.0,7.5kr). After one year of field investigation, it was found that the seedling stage was postponed with the increase of irradiation dose. 3kr treatment delayed 20 to 30 days; 6kr treatment delayed 50 to 100 days. The rate of emergence decreased with the increase of dosage. Morphological mutation rate increased with the increase of dose in the range of critical dose (LD40). Suitable exposure dose (LD50): dormancy tea seed 3 ~ 6kr; germination of tea seed around 3kr. Lethal dose (LD100): dormancy tea seed between 6 ~ 9kr; germination of tea seed 4.5kr or more. The shoot growth potential of shoots weakened with increasing doses during the year of irradiation, but there was no significant difference between treatments at 3kr and 6kr (a = 0.001).