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首页> 外文期刊>Journal of Experimental Botany >Greater lateral root branching density in maize improves phosphorus acquisition from low phosphorus soil
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Greater lateral root branching density in maize improves phosphorus acquisition from low phosphorus soil

机译：玉米中较大的侧向根部支化密度改善了低磷土壤的磷净化

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摘要

The development of crops with better growth under suboptimal phosphorus availability would improve food security in developing countries while reducing environmental pollution in developed countries. We tested the hypothesis that maize (Zea mays) phenotypes with greater lateral root branching density have greater phosphorus acquisition from low phosphorus soils. Recombinant inbred lines with either 'many short' (MS) or 'few long' (FL) lateral root phenotypes were grown under high and low phosphorus conditions in greenhouse mesocosms and in the field. Under low phosphorus in mesocosms, lines with the MS phenotype had 89% greater phosphorus acquisition and 48% more shoot biomass than FL lines. Under low phosphorus in the field, MS lines had 16% shallower rooting depth (D-95), 81% greater root length density in the top 20 cm of the soil, 49% greater shoot phosphorus content, 12% greater leaf photosynthesis, 19% greater shoot biomass, and 14% greater grain yield than FL lines. These results are consistent with the hypothesis that the phenotype of many, shorter lateral roots improves phosphorus acquisition under low phosphorus availability and merits consideration for genetic improvement of phosphorus efficiency in maize and other crops.
机译：在次优磷的可用性下具有更好增长的作物的发展将改善发展中国家的粮食安全，同时减少发达国家的环境污染。我们测试了具有更高侧根支化密度的玉米（Zea mays）表型的假设具有从低磷土壤的磷均衡。重组近亲与“许多短”（MS）或“少量长”（FL）横向根表型在温室中的温室和低磷条件下生长，在温室中的高磷条件下和该领域。在中核肌的低磷中，具有MS表型的线具有89％的磷置灾和48％的芽生物质比流动。在该领域的低磷下，MS系列具有16％的生根深度（D-95），在土壤20厘米的前20厘米的根部长度为81％，芽磷含量为49％，12％叶片光合作用，19％拍摄生物质的较高％，谷物产率大于FL线。这些结果与许多表型的假设一致，较短的横向根部的表型改善了低磷可用性下的磷血液，并对玉米和其他作物的磷效率的遗传提高进行了考虑。

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