Water deficit is an important abiotic stress factor limiting sugarcane production. Understanding the effect of water deficit on cane yield, yield components and genotype × environment (G × E) interaction can aid in selecting genotypes that are adapted to water deficit conditions. In this study, response of cane yield and yield components of 10 sugarcane genotypes grown under 3 irrigation treatments—fully irrigated, semi-irrigated and rainfed—was examined across 3 locations and 3 crop-years within each location. Cane yield reduced by 32% and 9% in the rainfed and semi-irrigated treatments, respectively, compared to the fully irrigated treatment. Genotypic variation was highly significant for cane yield and yield components in all three irrigation regimes. Cane yield in the rainfed treatment showed significant genetic correlation with stalk diameter (r = 0.68), leaf number (r = 0.64), node number (r = 0.67) and stalk number (r = 0.68). Genotype × irrigation variance was negligible compared to genotype, genotype × location and genotype × crop-year variances. Commercial genotypes had higher yield in most environments except in low-yield potential environments, which caused a significant genotype × location × irrigation effect, suggesting opportunities for improving sugarcane productivity in these environments.

中文翻译：

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可用水对甘蔗产量和产量构成的基因型与环境相互作用的有限贡献

水分亏缺是限制甘蔗生产的重要非生物胁迫因素。了解缺水对甘蔗产量、产量构成和基因型 × 环境 (G × E) 相互作用的影响有助于选择适合缺水条件的基因型。在这项研究中，在 3 个地点和每个地点的 3 个作物年中，检查了在 3 种灌溉处理（完全灌溉、半灌溉和雨育）下生长的 10 种甘蔗基因型的甘蔗产量和产量成分的响应。与完全灌溉处理相比，雨养处理和半灌溉处理的甘蔗产量分别减少了 32% 和 9%。在所有三种灌溉制度中，基因型变异对甘蔗产量和产量构成都非常显着。雨养处理的甘蔗产量与茎直径 (r = 0.68)、叶数 (r = 0.64)、节数 (r = 0.67) 和茎数 (r = 0.68) 显示出显着的遗传相关性。与基因型、基因型 × 位置和基因型 × 作物年变异相比，基因型 × 灌溉变异可以忽略不计。除了低产潜力环境外，商业基因型在大多数环境中产量更高，这导致显着的基因型×位置×灌溉效应，表明这些环境中存在提高甘蔗生产力的机会。