玉米Non-Reid群产量因素遗传改良效果及杂种优势和配合力分析
【目的】以No-Reid优良自交系PH4CV、PHB1M为基础材料，采用DH技术和常规技术方法，经过两轮改良，育成4个改良系，研究单株产量的遗传增益、杂种优势及配合力。【方法】以4个改良系及PH4CV、PHB1M为父本，5个Reid优良自交系为母本，作5×6不完全双列杂交，设置6、7.5、9万株/hm2三种密度梯度。【结果】第二轮改良系J1881，在三种密度下单株产量遗传增益高于原基础系和第一轮改良自交系；第一轮改良系J9D207、J1577遗传增益高于原始基础系。3种密度梯度下，4个改良系与Reid自交系单株产量杂种优势普遍存在，杂种优势最高的组合为J1590×J9D207、J1590×J1881。【结论】3种密度下，第二轮改良系J1881均有较高一般配合力，稳产性较好，为成功改良系。
英文摘要:
【Objective】Based on No-Reid fine inbred lines PH4CV and PHB1M, After two rounds of improvement，4 modified lines were bred by DH and conventional techniques. The genetic gain, Heterosis and combining ability of single plant yield were studied.【Method】With 4 improved lines and PH4CV and PHB1M as paternal and 5 Reid inbred lines as maternal parents, 5 * 6 incomplete diallel crosslines were made. Three density gradients were set up, 60 thousand strains of /hm2, 75 thousand /hm2 and 90 thousand /hm2, respectively. 【Result】 The genetic gain of the single plant yield of the second round of the improved line J1881 was higher than that of the original base line and the first improved inbred line at the three densities. The genetic gain of J9D207 and J1577 in the first round was higher than that of the original base. Under 3 density gradients, the yield heterosis of 4 modified lines and Reid inbred lines was common. The highest heterosis combinations were J1590 x J9D207 and J1590 x J1881. 【Conclusion】The results of the combination force analysis show that, under 3 kinds of density, the improved system The second round J1881 has higher general combining ability. It is said that the stable yield is good, and it is a successful improvement line.
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