Abstract: Radiate-breeding is a rapid and effective approach for plant breeding besides the conventional cross-breeding.Stolons and rhizomes of 8 hybrid bermudagrasses were irradiated by⁶⁰Co-γrays with two dosages of 9000 rads and 11300 rads.In order to obtain new cultivars with good turf characteristics,21 M₁ and M₁ and their parents were evaluated in aspects of turf quality,cold tolerance and growth rate.The results show that the inducement effect of ⁶⁰Co γ irradiation on turf quality was obvious and nondirective,some of them resulted in good variance and others bad variance.According to the results of evaluation,C75104M2-1/1,C75502M1,and C75103M1-1 were the three excellent mutant progenies with high turf quality,and their cold tolerance are -0.51℃,-3.54℃ and-3.67℃,respectively.Among them,C75502M1 was identified as a mutant progeny with good turf quality and high growth rate.

Key words: Hybrid bermudagrass, Radiated mutation, Turf quality, Cold tolerance, Growth rate

摘要： 辐射育种是一种获得优良品种的快速有效的植物育种方法。本试验采用9000和11300 rads的⁶⁰Co-γ射线,对8份杂交狗牙根(Cynodon dactylon×C.transvaalensis)的匍匐茎和根状茎进行辐射诱变,从坪用价值、抗寒性和生长速度3个方面对亲本及21个后代进行综合分析与评价,以选育出坪用价值高、生长速度快且抗寒性强的优良狗牙根新种质。结果显示:诱变使狗牙根的坪用性状发生了丰富的不定向的变异,同一亲本通过诱变既可以产生良性变异,也可以产生劣性变异;综合评价结果选育出坪用价值优良的诱变后代3份,分别为C75104M2-1/1,C75502M1和C75103M1-1,其抗寒性半致死温度分别为-0.51,-3.54和-3.67℃,其中C75502M1为坪用价值高且生长速度快的优良诱变后代。

关键词: 杂交狗牙根, 辐射诱变, 坪用价值, 抗寒性, 生长速度