RESPONSE TO SELECTION OF A MAIZE POPULATION FOR ADAPTATION TO HIGH OR LOW NITROGEN FERTILIZATION
RESPONSE TO SELECTION OF A MAIZE POPULATION FOR ADAPTATION TO HIGH OR LOW NITROGEN FERTILIZATION
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玉米群体选择适应高氮肥或低氮肥的反应
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
P. Bertin
中科院分区：
文献类型：
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作者：
A. Gallais;M. Coque;P. Bertin
玉米品种对低氮肥的适应性可成为可持续农业的选择目标。接下来的问题是知道在低N输入（直接选择）还是在高N输入（间接选择）下进行选择更好。为了用特定材料回答这个问题，在两个周期内从同一群体发展了一个轮回选择，其中有两个独立的选择：一个适应低N输入，另一个适应高N输入。然后，在低氮和高氮输入下，对每个周期的种群进行了评价。结果表明，间接选择比直接选择效率高.这是由于低氮输入时遗传力较低，环境方差和基因型×环境互作比高氮输入时高。经过一轮选择后，低氮输入下的遗传瓦里甚至低于高氮输入下的遗传变异。在两个选择周期中，材料对育种N-条件没有特异性适应。低氮输入环境是不利的选择环境。对籽粒产量的反应与籽粒蛋白质含量的降低有关。但籽粒蛋白质产量有所增加。
The adaptation of maize varieties to lower N-fertilization could become a selection goal for sustain- able agriculture. The question is then to know whether it is better to select at low N-input (direct selection) or at high N-input (indirect selection). To answer this question with specific material, a recurrent selection was devel- oped from the same population during two cycles, with two independent selections: one for adaptation to low N- input and the other for adaptation to high N-input. Popu- lations of each cycle were then evaluated with the initial population both at low and at high N-input. The results show a greater efficiency of indirect selection than of di- rect selection. This was interpreted as being due to a low- er heritability at low N-input, with higher environmental variance and genotype x environment interaction than at high N-input. After one cycle of selection, genetic vari- ance at low N-input was even lower than genetic variance at high N-input. During the two selection cycles there was no specific adaptation of the material to the breeding N- conditions. A low N-input environment appeared as an unfavourable environment for selection. The response to grain yield was associated with a decrease in kernel pro- tein content. However there was an increase in grain pro- tein yield.