Plant Breeding Dept., Agricultural Institute, Carlow.
Theor Appl Genet. 1969 Jan;39(5):206-13. doi: 10.1007/BF00281975.
The results of experiments with white clover (Trifolium repens) in which time of nodulation and seedling plant weight or vigour were measured are reported. Experiments 1 and 2 were conducted in artificial growth medium in test tubes with controlled inoculation and experiment 3 in soil without controlled inoculation. Experiment 1 which was preliminary in nature showed the extent of the variation for time of nodulation after inoculation with Rhizobium trifolii. It was evident also that plant vigour and the number of days to nodulation were negatively correlated. Experiment 2 forms the major part of the results and is concerned with the analyses and interpretation of the diallel cross progeny of twelve plants selected from experiment 1. The results indicated a rather complex genetic picture for the two characters measured, namely days to nodulation and seedling plant weight at 80 days. Reciprocal (both general and specific) as well as additive (g.c.a.) and non-additive (s.c.a.) effects were present. Experiment 3, in which seed from 22 families of the diallel cross was sown in soil without controlled inoculation, indicated that the results obtained under the laboratory conditions of experiment 2 and those obtained in soil conditions were not correlated. The implications of these results in relation to selection of improved varieties of the host species are discussed.
报告了对白三叶草（Trifolium repens）进行实验的结果，其中测量了结瘤时间、幼苗植物重量或活力。实验 1 和 2 在带有受控接种的试管人工生长培养基中进行，实验 3 在没有受控接种的土壤中进行。初步性质的实验 1 表明了接种根瘤菌（Rhizobium trifolii）后结瘤时间的变化程度。显然，植物活力和结瘤天数呈负相关。实验 2 是结果的主要部分，涉及从实验 1 中选择的十二株植物的双列杂交后代的分析和解释。结果表明，所测的两个特征，即结瘤天数和 80 天幼苗植物重量，遗传情况相当复杂。存在相互（一般和特定）以及加性（g.c.a.）和非加性（s.c.a.）效应。实验 3 中，双列杂交种子从 22 个家系播种在没有受控接种的土壤中，表明在实验 2 的实验室条件下获得的结果与在土壤条件下获得的结果不相关。讨论了这些结果在宿主物种改良品种选择方面的意义。
