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首页> 外文期刊>Genetic Resources and Crop Evolution >Variability in European Maize (Zea mays L.) Landraces under High and Low Nitrogen Inputs
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Variability in European Maize (Zea mays L.) Landraces under High and Low Nitrogen Inputs

机译：高氮和低氮输入下欧洲玉米（Zea mays L.）地方种的变异性

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An European maize (Zea mays L.) landrace core collection (EMLCC) was formed with samples from several countries. Evaluation of the EMLCC may contribute to broad the genetic base of maize breeding programs. The objective of this study was to assess the variability of EMLCC under low nitrogen (N) in relation to high N input. Eighty-five landraces of the EMLCC, grouped in four maturity groups, and three check hybrids were evaluated for response to low (0 kg ha?1) and high (150 kg ha?1) N in Spain and Greece. Five plant size traits (plant height, ear height, leaf length, leaf width and leaf area index), two grain traits (1000-kernel weight and grain yield), and two agronomic traits [growing degree units (GDU) and lodging] were studied. Overall means of plant size and grain traits increased when genotypes were grown at 150-N relative to 0-N input. The relative increase for grain traits was smaller in landraces than in hybrids. This suggests that landraces had lower grain yield response to N supply compared to hybrids. Linear regressions of plant size traits on GDU indicated that vegetative development was primarily associated with flowering lateness. The maturity group was the main source of variation for all traits. Landrace variability within maturity groups was significant for all traits across environments, despite significant landrace × environment interactions. Estimates of genetic and genotype × environment variances, and heritabilities at both high and low N inputs were not significantly different from each other. However estimates were generally larger at high N. Genetic and phenotypic correlation coefficients between the two N levels were very high for all traits.
机译：欧洲玉米（Zea mays L.）地方品种核心种质（EMLCC）由来自多个国家的样品组成。对EMLCC的评估可能有助于扩大玉米育种计划的遗传基础。这项研究的目的是评估在低氮（N）下EMLCC与高氮输入之间的差异。分为四个成熟度组的八十五个EMLCC地方品种和三个检查杂种评估了低氮（0 kg ha？1 ）和高氮（150 kg ha？1 ）的响应。西班牙和希腊。五个植物大小性状（株高，穗高，叶长，叶宽和叶面积指数），两个籽粒性状（1000粒重和籽粒产量）和两个农艺性状（生长度单位（GDU）和倒伏）分别为研究。当基因型相对于0-N输入以150-N生长时，植物大小和谷物性状的总体平均值增加。地方品种的籽粒性状的相对增加小于杂种。这表明与杂交种相比，地方品种对氮供应的谷物产量响应较低。 GDU上植物大小性状的线性回归表明，营养发育主要与开花迟缓有关。成熟度组是所有性状变异的主要来源。尽管地方品种×环境之间存在显着的相互作用，但成熟组内地方品种的变异性对于整个环境中的所有性状都是显着的。遗传和基因型×环境变异的估计值，以及高氮输入和低氮输入的遗传力都没有显着差异。然而，在高氮水平下，估计值通常更大。对于所有性状，两个氮水平之间的遗传和表型相关系数都很高。

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