Prediction of indirect selection for seed and forage yield of lucerne based on evaluation under spaced planting
Prediction of indirect selection for seed and forage yield of lucerne based on evaluation under spaced planting
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基于间作评价的苜蓿种子和饲草产量间接选择预测
DOI：
10.1111/j.1439-0523.2006.01295.x
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发表时间：
2006
期刊：
影响因子：
2
通讯作者：
P. Annicchiarico
中科院分区：
文献类型：
--
作者：
P. Annicchiarico
间隔种植下的表型选择经常用于饲料物种。本研究旨在比较密集种植下苜蓿种子或饲料产量直接选择的预测效率与基于间隔种植下评估的相同性状或种子产量组成部分的间接选择的预测效率。从局部适应种质的代表性样本中随机选择的 16 个基因型，作为间隔为 75 cm 的单个克隆（密度 = 1.78 株/m 2 ）生长两年，并在由一排 4 个克隆间隔为 10 cm（密度 = 50 株/m 2 ）形成的密集地块中生长两年，使用随机完整区组设计和三次重复。由于植物密度之间的中等遗传相关性（r g = 0.66）以及间隔种植比密集种植略高的广义遗传力，间隔种植下基于种子产量的间接选择仅比直接选择效率低19%。在间隔种植下，基于单个种子产量组成部分的密度间接选择种子产量的相对效率范围从中等到非常低，并且始终低于 45%。相对于直接选择，基于间隔种植下产量响应的干物质产量间接选择的总产量（64%）效率适中，第二年产量（32%）非常低。
Phenotypic selection under spaced planting is frequently used in forage species. This study aimed to compare the predicted efficiency of direct selection for lucerne seed or forage yield under dense planting with indirect selection based on the same traits or seed yield components evaluated under spaced planting. Sixteen genotypes randomly chosen from a representative sample of locally adapted germplasm were grown for two years as individual clones spaced at 75 cm (density = 1.78 plants/m 2 ) and in dense plots formed by one row of four clones spaced at 10 cm (density = 50 plants/m 2 ) using a randomized complete block design with three replications. Indirect selection based on seed yield under spaced planting was just 19% less efficient than direct selection, owing to moderate genetic correlation between plant densities (r g =0.66) and somewhat higher broad-sense heritability under spaced planting than under dense planting. The relative efficiency of indirect selection for seed yield in density based on individual seed yield components under spaced planting ranged from modest to very low and was always below 45%. The efficiency of indirect selection for dry matter yield based on yield response under spaced planting was moderate for total yield (64%) and very low for second-year yield (32%) relative to direct selection.