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缺铁是石灰性土壤常见的植物营养问题之一。禾本科植物种或基因型的植物铁载体分泌能力与耐缺铁有关 ,提高植物铁载体分泌能力是改良缺铁的土壤上植物铁营养的关键措施之一。在水培条件下分析了冬小麦(TriticumaestivumL .) 3个杂交种及其 4个亲本在缺铁营养液中植物铁载体的分泌及杂种的效应。植物铁载体的分泌率通过根分泌物对新形成的Fe(OH) 3 的活化能力进行测定 ,在缺铁症出现时每隔 2、3天测定 1次。在缺铁条件下 ,所有基因型都分泌较多的植物铁载体 ,并且随缺铁症状的发展分泌量增加。杂交种具有对缺铁更敏感的反馈系统 ,在缺铁条件下 ,杂交种比亲本分泌铁载体的速度更快、量更高。通过分析杂交种和亲本的关系 ,认为可以通过对亲本分泌植物铁载体能力和配合力的选择 ,利用杂种优势来提高小麦铁的利用效率。
Iron deficiency is one of the common plant nutrition problems in calcareous soils. Gramineous plant species or genotypes of plant iron carrier secretion capacity and resistance to iron deficiency, improve plant iron carrier secretion is one of the key measures to improve plant iron nutrition in iron deficiency soil. Under hydroponic culture conditions, the effects of plant iron transporter and hybrids on three hybrids of Triticum aestivum L. and their four parents in iron deficiency nutrient solution were analyzed. The rate of excretion of plant iron carriers is determined by the ability of root exudates to activate newly formed Fe (OH) 3, and once every 2 or 3 days when iron deficiency occurs. In the absence of iron, all genotypes secreted more plant iron carriers, and increased secretion with the development of iron deficiency symptoms. Hybrids have a feedback system that is more sensitive to iron deficiency, in which the hybrids are faster and more abundant than the parentally secreting iron carriers under iron deficient conditions. By analyzing the relationship between hybrids and parents, we think that we can utilize heterosis to improve the utilization efficiency of wheat iron by selecting the ability and combining ability of plant iron carriers.