Abstract Aims While the relationship between genetic diversity and plant productivity has been established for many species, it is unclear whether environmental conditions and biotic associations alter the nature of the relationship. To address this, we investigate the interactive effect of genotypic diversity, drought and mycorrhizal association on plant productivity and plant traits. Methods Our mesocosm study was set up at the Konza Prairie Biological Research Station, located in the south of Manhattan, Kansas. Andropogon gerardii Vitman, the focal species for our study, was planted in two levels of genotypic richness treatment: monoculture or three-genotype polyculture. A rainout shelter was constructed over half of the experimental area to impose a drought and Thiophanate-methyl fungicide was used to suppress arbuscular mycorrhizal fungi in selected pots within each genotypic richness and drought treatment. Important Findings Genotypic richness and mycorrhizal association did not affect above-ground biomass of A. gerardii. Drought differentially affected the above-ground biomass, the number of flowers and bolts of A. gerardii genotypes, and the biomass and the functional traits also differed for monoculture versus polyculture. Our results suggest that drought and genotypic richness can have variable outcomes for different genotypes of a plant species.

中文翻译：

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基因型丰富度、干旱和菌根关联对优势 C4 草的生产力和功能性状的影响

摘要 目的 虽然已经为许多物种建立了遗传多样性和植物生产力之间的关系，但尚不清楚环境条件和生物关联是否会改变这种关系的性质。为了解决这个问题，我们研究了基因型多样性、干旱和菌根关联对植物生产力和植物性状的交互影响。方法 我们的中宇宙研究设在堪萨斯州曼哈顿南部的康扎草原生物研究站。我们研究的重点物种 Andropogon gerardii Vitman 被种植在两个基因型丰富度处理水平：单一栽培或三基因型混养。在实验区的一半以上建造了一个避雨棚以施加干旱，并在每个基因型丰富度和干旱处理的选定盆中使用甲基硫菌灵杀菌剂来抑制丛枝菌根真菌。重要发现 基因型丰富度和菌根关联不影响 A. gerardii 的地上生物量。干旱对地上生物量、A. gerardii 基因型的花和螺栓数的影响不同，单种与混种的生物量和功能性状也不同。我们的研究结果表明，干旱和基因型丰富度可能对植物物种的不同基因型产生不同的结果。