ArticleFrontiers in plant science2026
Genotypic variation in nitrogen use efficiency and yield stability of 28 indica hybrid rice cultivars under tropical nitrogen gradients.
Article in Frontiers in plant science, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 1 paper.
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7 authors.
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Abstract
Introduction: Excessive nitrogen (N) application is a prevalent issue in tropical rice production, often leading to environmental degradation without guaranteeing yield gains. Exploiting genotypic potential for low-N tolerance is essential for sustainable intensification. Methods: This study investigated the N response of 28 indica hybrid rice cultivars under a gradient of N rates (60-240 kg N ha Results: We identified significant genotypic divergence in yield sensitivity to N, categorizing the varieties into four functional groups: High-efficiency/High response, Low-efficiency/High-response, High-efficiency/Low-response, and High-N inhibited. The differentiation in yield potential was mechanistically linked to plasticity in effective panicle number and sink size (spikelet number per panicle). Crucially, this study highlights a pathway for N reduction: 10 identified cultivars maintained yields exceeding 8.0 t ha Discusssion: These "N-efficient and stable-yielding" varieties demonstrated superior N agronomic efficiency, suggesting that optimizing variety selection can reduce rice productivity's dependence on high N inputs. These results provide scientific support for N reduction and efficiency-enhancement strategies in tropical agroecosystems.
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