玉米抗枯萎病(Zea mays L.)的遗传

IF 1 4区 生物学 Q3 PLANT SCIENCES Indian Journal of Genetics and Plant Breeding Pub Date : 2020-11-30 DOI:10.31742/ijgpb.80.4.5
B. Babu, H. Lohithaswa, A. M. Rao, N. Mallikarjuna
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引用次数: 0

摘要

由枯萎病菌(Fusarium verticilloides)引发的镰刀菌茎腐病(Fusarium stalk rot disease, FSR)正在成为许多玉米主产区重要的生物生产制约因素,造成严重的产量损失。本研究通过6代的方法和方差来了解对FSR的抗性遗传,作为解决这一问题的第一步。通过4个FSR敏感自交系(VL1043、VL108867、VL121096和VL1218)与2个抗FSR自交系(CM202和CM212)杂交,获得5个FSR亲本。在2018年雨季后和2019年夏季,通过人工接种对5个杂交组合(VL1043 × CM212、VL108867 × CM202、VL121096 × CM212、VL1218 × CM202和VL1218 × CM212)进行6代鉴定。除垢试验和联合除垢试验表明,加性-显性模型存在不足,5个杂交组合均存在上位基因效应。本研究进一步揭示了加性、显性和加性×加性基因效应在FSR表达中的重要性。加性遗传效应[a]、显性遗传效应[d]、加性遗传变异(2A)和显性遗传变异(2D)的大小和方向随季节的遗传背景而变化。重复基因互作在FSR抗性遗传中表现明显。加性成分和非加性成分都很重要,因此在获得抗FSR玉米自交系时,相互循环选择更为有效。
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Genetics of resistance to Fusarium stalk rot caused by Fusarium verticilloides in maize (Zea mays L.)
Fusarium stalk rot disease (FSR), incited by Fusarium verticilloides, is becoming an important biotic production constraint in many major maize growing areas causing substantial yield losses. The present investigation was conducted to understand the genetics of resistance to FSR through six generation means and variances, as a first step in addressing the problem. Five crosses were developed by crossing four FSR susceptible inbreds (VL1043, VL108867, VL121096 and VL1218) with two resistant inbreds (CM202 and CM212). Six generations of the five crosses (VL1043 × CM212, VL108867 × CM202, VL121096 × CM212, VL1218 × CM202 and VL1218 × CM212) were evaluated through artificial disease inoculation during post rainy season of 2018 and summer, 2019. The scaling tests and joint scaling tests indicated the inadequacy of additive-dominance model and showed the presence of epistatic gene effects in all the five crosses for FSR resistance. The study further revealed the importance of additive, dominance and additive × additive gene effects in the expression of FSR. The magnitude and direction of the additive genetic effects [a], dominance genetic effects [d], magnitudes of additive genetic variance (2A) and dominance genetic variance (2D) varied with the genetic background of the crosses over seasons. Duplicate gene interaction was evident in the inheritance of FSR resistance. Both, additive and non-additive components were found important thus reciprocal recurrent selection would be more effective in obtaining FSR resistant maize inbred lines.
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来源期刊
CiteScore
1.80
自引率
10.00%
发文量
0
审稿时长
6-12 weeks
期刊介绍: Advance the cause of genetics and plant breeding and to encourage and promote study and research in these disciplines in the service of agriculture; to disseminate the knowledge of genetics and plant breeding; provide facilities for association and conference among students of genetics and plant breeding and for encouragement of close relationship between them and those in the related sciences; advocate policies in the interest of the nation in the field of genetics and plant breeding, and facilitate international cooperation in the field of genetics and plant breeding.
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