GENETIC-ANALYSIS OF COLD HARDINESS AND DORMANCY IN ALFALFA
GENETIC-ANALYSIS OF COLD HARDINESS AND DORMANCY IN ALFALFA
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DOI：
10.1139/g87-024
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发表时间：
1987-02-01
期刊：
影响因子：
3.1
通讯作者：
WELTERLEN, M
中科院分区：
文献类型：
--
作者：
PERRY, MC;MCINTOSH, MS;WELTERLEN, M
紫花苜蓿（Medicago sativa L.）的耐寒性与秋季休眠呈正相关，尽管这种关系并不总是最理想的产量。本研究利用6个抗寒性和秋休眠性不同的亲本及其S0和S1后代，确定抗寒性和休眠性的基本遗传信息。A 6倍。通过双列杂交分析确定一般配合力和特定配合力的差异。采用亲代回归分析估计抗寒性和秋季休眠的遗传力。秋季休眠期是在9月最后一次采伐后42天测量的株高。采用-8℃下植物根组织外溶电解质的比电导率测定其抗寒性。C.一般配合力对比电导率和比高有显著影响。特异配合力对特异电导率也有显著影响。S0杂交后代的平均值比亲本高11% ~ 13%。根据亲代回归系数估算的遗传力比电导率为1.32，高度为0.72。除S1代的身高外，各代的比电导率与秋叶生长均呈显著正相关。这种相关性随着世代的更替而降低。基因型相关性是正的、大的，并且每一代都在增加，这表明环境相关性是大的、负的，并且在减少。这两种性状之间存在联系。选用合适的选育方法，选育耐寒性和秋长性都很快，但选育耐寒性和秋长性都很高的品种则比较困难。
Cold hardiness and fall dormancy in alfalfa (Medicago sativa L.) are positively associated, although this relationship is not always desirable for maximum production. The purpose of this study was to determine basic genetic information about cold hardiness and dormancy utilizing six parents differing in their cold hardiness and fall dormancy and their S0 and S1 progeny. A 6 .times. 6 diallel analysis was conducted to determine differences in general and specific combining abilities. Parent-offspring regression analyses were used to estimate heritabilities for cold hardiness and fall dormancy. Fall dormancy was measured as plant height 42 days after a final cut in September. Cold hardiness was measured using specific conductivity of exosmolyzed electrolytes of plant root tissues subjected to -8.degree. C. General combining abilities were significant for specific conductivity and height. Specific combining ability was also significant for specific conductivity. Mean values for S0 cross progeny were 11 to 13% higher than midparent values. Heritability estimates based on parent-offspring regression coefficients were 1.32 for specific conductivity and 0.72 for height. Significant positive phenotypic correlation were found for specific conductivity and fall growth for all generations except for height for S1 progeny. The correlations decreased with each successive generation. Genotypic correlation were positive, large, and increasing for each generation indicating large, negative, and decreasing environmental correlations. Linkage of these two traits is suggested. Selection for cold hardiness and fall growth would be rapid with proper breeding methods, but selection for high levels of both cold hardiness and fall growth would be difficult with the cultivars used in this study.