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本试验研究了梅菲2号、74-105等籼稻品种对白叶枯病菌76-25菌株的抗性遗传。通过对抗病亲本与感病亲本之间杂交(包括正,反交)的F1、F2、F3和回交群体抗病性的研究,结果表明: (1)梅菲2号的抗病性由一个显性基因和一个隐性基因控制;74-105、HA77331、IR22、IR50和740098的抗病性各由一个显性基因控制。(2)供试抗病亲本前后期一致抗病的模式,不因杂交世代的不同而改变。(3)梅菲2号、74-105等6个品种均可作为我省丰产抗白叶枯病育种的籼稻抗源。其中74-105可作为我国南方稻区兼抗白叶枯病和细菌性条斑病育种的抗源,740098、IR50可作为晚籼多抗性育种的抗源。(4)抗病品种梅菲2号、74-105分别与感病品种杂交,后代的抗病性质由细胞核决定;而抗病程度与细胞质有一定关系,表现为以抗源作母本的高于以抗源作父本的。
In this study, the resistance inheritance of Xanthomonas oryzae 76-25 was studied in indica rice varieties such as Mefi 2 and 74-105. The results showed that: (1) The disease resistance of Meifi 2 was controlled by the resistance of F1, F2, F3 and backcrossing population between the parents and susceptible parents (including positive and negative) One dominant gene and one recessive gene. The resistance of 74-105, HA77331, IR22, IR50 and 740098 were all controlled by one dominant gene. (2) The pattern of consistent disease resistance before and after the disease-resistant parents tested did not change due to the different crosses. (3) 6 varieties, such as Mayfly 2 and 74-105, could be used as indica rice breeding for high yielding bacterial blight resistance in our province. Among them, 74-1058 could be used as a resistant source for resistance to bacterial blight and bacterial leaf streak in the rice planting area in South China. (4) The resistant varieties, Mei Fei 2 and 74-105, were crossed with susceptible varieties respectively. The resistance of the offspring was determined by the nucleus, while the resistance was related to the cytoplasm. In the anti-source as the father of.