Differential regulation of five Pht1 phosphate transporters from maize (Zea mays L.)
Differential regulation of five Pht1 phosphate transporters from maize (Zea mays L.)
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DOI：
10.1055/s-2005-873052
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发表时间：
2006-03-01
期刊：
影响因子：
3.9
通讯作者：
Bucher, M
中科院分区：
文献类型：
--
作者：
Nagy, R;Vasconcelos, MJV;Bucher, M
玉米是发展中国家最重要的作物之一，在那里，不利的土壤条件和低化肥投入是稳定粮食供应的两个主要制约因素。了解参与养分吸收的分子和生物化学机制，预计将支持未来育种策略的发展，旨在提高玉米生产力的贫瘠土壤。磷是土壤中移动的最少的常量营养素，它常常限制植物的生长。在这项工作中，五个基因编码Pht1磷酸盐转运蛋白，有助于磷的吸收和分配在玉米中被确定。在磷饥饿的植物中，这五种转运蛋白的转录本大多存在于根和叶中。独立的磷酸盐供应，两个基因的表达是占主导地位的花粉或共生菌根真菌的根殖民地，分别。有趣的是，高水平的菌根诱导基因的转录也可检测到磷饥饿植物的叶片。因此，Pht1磷酸盐转运蛋白在玉米中的差异表达表明，参与不同的过程中，包括从土壤中的磷酸盐吸收和运输在共生界面的菌根，磷酸盐（重新）易位在地上，和磷酸盐的吸收在花粉管生长过程中编码的蛋白质。
Maize is one of the most important crops in the developing world, where adverse soil conditions and low fertilizer input are the two main constraints for stable food supply. Understanding the molecular and biochemical mechanisms involved in nutrient uptake is expected to support the development of future breeding strategies aimed at improving maize productivity on infertile soils. Phosphorus is the least mobile macronutrient in the soils and it is often limiting plant growth. In this work, five genes encoding Pht1 phosphate transporters which contribute to phosphate uptake and allocation in maize were identified. In phosphate-starved plants, transcripts of most of the five transporters were present in roots and leaves. Independent of the phosphate supply, expression of two genes was predominant in pollen or in roots colonized by symbiotic mycorrhizal fungi, respectively. Interestingly, high transcript levels of the mycorrhiza-inducible gene were also detectable in leaves of phosphate-starved plants. Thus, differential expression of Pht1 phosphate transporters in maize suggests involvement of the encoded proteins in diverse processes, including phosphate uptake from soil and transport at the symbiotic interface in mycorrhizas, phosphate (re)translocation in the shoot, and phosphate uptake during pollen tube growth.