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首页> 外文期刊>Plant and Soil >Root foraging capacity depends on root system architecture and ontogeny in seedlings of three Andean Chenopodium species
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Root foraging capacity depends on root system architecture and ontogeny in seedlings of three Andean Chenopodium species

机译：根的觅食能力取决于三种安第斯藜属植物的根系结构和个体发育

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摘要

Morphological and ontogenetic variation in root system architecture holds ecological significance, particularly in low-resource habitats where soil rooting is critical for both seedling establishment and water and nutrient uptake. To assess this variation under contrasted agroecological backgrounds, root architecture and rooting patterns were compared in Andean populations of Chenopodium hircinum, Chenopodium pallidicaule and two ecotypes (wet- and dry-habitat) of Chenopodium quinoa.Seedlings were grown in rhizotrons under controlled water and nutrient availability. Root branching and elongation dynamics were characterized during 6 weeks after germination, while leaf area, above and below-ground biomass, and specific root length were determined at the end of the experiment.Despite large differences in aboveground biomass, all populations showed similar herringbone root systems. The dry-habitat C. quinoa had generally the highest root trait values, with fast taproot elongation, thick roots and long root segments resulting in high total root length and deep root proliferation.Irrespective of their contrasting agroecological background, the studied chenopods displayed a similar root system topology. However, from very early development stages, they showed differential root foraging patterns with two extremes: fast and vigourous rooting at depth in the dry-habitat C. quinoa, and shallow and thin root system in C. pallidicaule adapted to shallow-soil and high-altitude habitats
机译：根系结构的形态学变化和个体发育变化具有生态学意义，尤其是在资源稀少的低资源生境中，土壤生根对于苗木的建立以及水分和养分的吸收均至关重要。为了在不同的农业生态背景下评估这种变化，比较了安第斯藜（Chenopodium hircinum），苍白藜（Chenopodium pallidicaule）和藜麦（藜）的两种生态型（湿生和干生）的根结构和生根模式。可用性。在发芽后的6周内表征了根的分支和伸长动态，同时在实验结束时确定了叶面积，地上和地下的生物量以及比根长。尽管地上生物量差异很大，但所有种群都显示出相似的人字形根系统。干栖藜通常具有最高的根性状值，具有快速的主根伸长，较厚的根和较长的根段，从而导致较高的总根长和较深的根系增殖。根系统拓扑。然而，从很早的发育阶段开始，它们就表现出不同的根觅食模式，有两个极端：在干旱栖息地奎奴亚藜深处快速而有力的生根，而在淡水梭菌中浅而薄的根系适合于浅土和高根。海拔栖息地

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