Enlarged Sink Capacity and Optimized Population Physiological Characteristics are Key to High Yield in Conventional Japonica Rice

IF 7.4 2区农林科学 Q1 AGRONOMY

Rice Science Pub Date : 2026-01-01 Epub Date: 2025-10-15 DOI:10.1016/j.rsci.2025.10.004

Zhang Haipeng , Mi Kailiang , Chen Ting, Zhang Muyan, Xu Fangfu, Zhang Hongcheng

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引用次数: 0

Abstract

Clarifying the photosynthetic and population characteristics of conventional japonica rice at different yield levels is crucial for boosting yield and ensuring food security. Therefore, a two-year field trial with two conventional japonica varieties was conducted at four planting densities: 16 cm × 30 cm (D1), 14 cm × 30 cm (D2), 12 cm × 30 cm (D3), and 10 cm × 30 cm (D4). This study aimed to investigate how photosynthetic and population characteristics influence grain yield under varying planting densities. The results indicated that higher yields were primarily driven by increased grain weight and seed-setting rate (with a 9.68%‒11.40% higher single panicle weight), supported by optimized dry matter translocation and source-sink relationships. Elevated planting density (D2‒D4) enhanced panicle number and total spikelet number (by 3.91%‒15.00%) but reduced the number of spikelets per panicle, 1000-grain weight, and photosynthetic efficiency due to mutual shading. Despite these trade-offs, yield increased by 4.10%‒12.42% under higher densities. The use of planting density D4 in japonica rice cultivation contributed to maximize yield. These findings provide important theoretical insights and practical significance for increasing the yield of conventional japonica rice and ensuring food security.

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扩大库容和优化群体生理特性是常规粳稻高产的关键

阐明不同产量水平下常规粳稻的光合特性和种群特征，对提高产量和保障粮食安全至关重要。为此，以2个粳稻品种为研究对象，以16 cm × 30 cm （D1）、14 cm × 30 cm （D2）、12 cm × 30 cm （D3）和10 cm × 30 cm (D4) 4种种植密度进行了为期2年的田间试验。本研究旨在探讨不同种植密度下光合特性和群体特性对籽粒产量的影响。结果表明，增产主要是由于籽粒重和结实率的提高（单穗重提高9.68% ~ 11.40%），并有优化的干物质转运和源库关系的支持。增加种植密度（d2 ~ d4）可提高穗数和总粒数（3.91% ~ 15.00%），但由于相互遮荫，降低了每穗粒数、千粒重和光合效率。尽管存在这些权衡，但在较高的密度下，产量增加了4.10%-12.42%。种植密度D4在粳稻栽培中的应用有助于产量最大化。这些发现对提高传统粳稻产量、保障粮食安全具有重要的理论见解和现实意义。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Rice Science Agricultural and Biological Sciences-Agronomy and Crop Science

CiteScore

8.90

自引率

6.20%

发文量

审稿时长

40 weeks

期刊介绍： Rice Science is an international research journal sponsored by China National Rice Research Institute. It publishes original research papers, review articles, as well as short communications on all aspects of rice sciences in English language. Some of the topics that may be included in each issue are: breeding and genetics, biotechnology, germplasm resources, crop management, pest management, physiology, soil and fertilizer management, ecology, cereal chemistry and post-harvest processing.