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首页> 外文期刊>Physiologia plantarum >A novel morphological response of maize (Zea mays) adult roots to heterogeneous nitrate supply revealed by a split-root experiment.
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A novel morphological response of maize (Zea mays) adult roots to heterogeneous nitrate supply revealed by a split-root experiment.

机译：分裂根实验揭示了玉米（Zea mays）成年根对异质硝酸盐供应的新形态响应。

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摘要

Approximately 35-55% of total nitrogen (N) in maize plants is taken up by the root at the reproductive stage. Little is known about how the root of an adult plant responds to heterogeneous nutrient supply. In this study, root morphological and physiological adaptations to nitrate-rich and nitrate-poor patches and corresponding gene expression of ZmNrt2.1 and ZmNrt2.2 of maize seedlings and adult plants were characterized. Local high nitrate (LoHN) supply increased both lateral root length (LRL) and density of the treated nodal roots of adult maize plants, but only increased LRL of the treated primary roots of seedlings. LoHN also increased plant total N acquisition but not N influx rate of the treated roots, when expressed as per unit of root length. Furthermore, LoHN markedly increased specific root length (mg-1) of the treated roots but significantly inhibited the growth of the lateral roots outside of the nitrate-rich patches, suggesting a systemic carbon saving strategy within a whole root system. Surprisingly, local low nitrate (LoLN) supply stimulated nodal root growth of adult plants although LoLN inhibited growth of primary roots of seedlings. LoLN inhibited the N influx rate of the treated roots and did not change plant total N content. The gene expression of ZmNrt2.1 and ZmNrt2.2 of the treated roots of seedlings and adult plants was inhibited by LoHN but enhanced by LoLN. In conclusion, maize adult roots responded to nitrate-rich and nitrate-poor patches by adaptive morphological alterations and displayed carbon saving strategies in response to heterogeneous nitrate supply.
机译：玉米植物在生殖阶段的根部吸收了总氮（N）的约35-55％。关于成年植物的根对异质养分供应的反应知之甚少。本研究描述了玉米幼苗和成年植物对富含硝酸盐和缺乏硝酸盐的斑块的根系形态和生理适应以及ZmNrt2.1和ZmNrt2.2的相应基因表达。局部高硝酸盐（LoHN）供应增加了成年玉米植物的处理过的根系根的侧根长度（LRL）和密度，但仅增加了处理过的幼苗初生根的LRL。当以单位根长表示时，LoHN还增加了植物总氮的吸收量，但不增加处理过的根的氮流入速率。此外，LoHN显着增加了处理过的根的比根长（mg -1 ），但显着抑制了富含硝酸盐的斑块外侧根的生长，这表明整个系统内均采用了碳节约策略根系统。出人意料的是，尽管LoLN抑制了幼苗初级根的生长，但局部低硝酸盐（LoLN）的供给刺激了成年植物的节根生长。 LoLN抑制了处理过的根的N流入速率，并且没有改变植物的总N含量。 LoHN抑制了幼苗和成年植物的根部ZmNrt2.1和ZmNrt2.2的基因表达，但LoLN增强了基因表达。总之，玉米成年根通过适应性形态变化对富含硝酸盐和缺乏硝酸盐的斑块作出反应，并显示出针对异质硝酸盐供应的节碳策略。

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