GENETIC STUDIES ON COLD HARDINESS IN MEDICAGO SATIVA L.
GENETIC STUDIES ON COLD HARDINESS IN MEDICAGO SATIVA L.
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苜蓿抗寒性遗传研究。
DOI：
10.1093/oxfordjournals.jhered.a107001
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发表时间：
1960
影响因子：
3.1
通讯作者：
C. Greenham
中科院分区：
文献类型：
--
作者：
H. Daday;C. Greenham
抗寒性是在澳大利亚堪培拉植物工业部通过测量预硬化植物冷处理后冠部的电阻来确定的，早期的研究表明电阻和恢复之间的表型相关性很高。 Hunter River 克隆之间的抗寒性（以电阻表示）存在高度显着差异，广义遗传力为 0.53 ± 0.23。使用电阻技术，对 Hairy Peruvian、Hunter River、Ladak 和 Rambler 进行的杂交研究表明，这些品种在耐寒性的总体配合能力方面存在显着差异，F1S 的耐寒性通常在两个亲本之间处于中等水平。没有获得关于抗寒性的非加性基因作用的迹象。 Rambler 为其 F1 后代提供了高度的耐寒性，而 Hairy Peruvian 则只赋予了较低的耐寒性。在F2African（易感）×Rambler（抗性）中，电阻与冬季干物质产量之间的相关系数为-0.38。两个品种（Hunter River 和 Rambler）内这两个变量之间的基因型相关性呈强烈负相关。在冷处理之前，暴露在 18 小时的日照下而不是自然光下，会导致混合群体的冬季产量和电阻增加。尽管F2个体的数据并没有完全排除获得具有良好冬季生长和中等抗寒性的重组体的可能性，但结果表明，抗寒性和冬季生长之间的负基因型相关性可能严重阻碍选择。
Hardiness was determined at the Division of Plant Industry, Canberra, Australia, by means of measurements of the electrical resistance of the crown after cold treatment of prehardened plants, earlier investigations having shown the phenotypic correlation between electrical resistance and recovery to be high. Highly significant differences in hardiness, expressed as electrical resistance, were demonstrated between clones of Hunter River, the heritability in a broad sense being 0.53 ± 0.23. Using the electrical-resistance technique, a study of crosses involving Hairy Peruvian, Hunter River, Ladak and Rambler indicated that these varieties differed significantly in general combining ability for hardiness, the F1S generally being intermediate in hardiness between the two parents. No indication was obtained of non-additive gene action with respect to hardiness. Rambler contributed a high degree of hardiness to its F1progenies, in contrast to Hairy Peruvian, which conferred only a low degree. In F2African (susceptible) × Rambler (resistant), the correlation coefficient between electrical resistance and winter yield of dry matter was -0.38. The genotypic correlation between these two variables within two varieties (Hunter River and Rambler) was strongly negative. Exposure to a day length of 18 hours instead of to natural light, prior to cold treatment, led to an increase in both winter yield and electric resistance in a mixed population. Although the data on F2individuals did not altogether rule out the possibility of securing recombi-nants with good winter growth and moderate hardiness, the results suggested that selection may be seriously hampered by a negative genotypic correlation between hardiness and winter growth.