Amylopectin is an essential starch property, and the chain-length distribution of amylopectin (APCLD) is closely associated with the eating and cooking quality of rice. In this study, a series of recombinant inbred lines derived from an indica/japonica cross were planted in four areas with distinct ecological conditions (LN, SC, JS, and GD), and the relationship among APCLD, environmental factors, and genetic background was analyzed. The results showed that APCLD was strongly influenced by environmental factors, which dynamically changed from heading to the mature stage. The solar radiation, luminous flux, and light hours were positively correlated with Fa but negatively correlated with Fb₁ and Fb₂. The temperature was negatively correlated with Fa and Fb₁ but positively correlated with Fb₂ and Fb₃. The temperature was the primary factor affecting APCLD, followed by humidity and light. There was no significant correlation between the indica pedigree percentage and APCLD. Furthermore, we detected six quantitative trait loci related to Fa, Fb₁, Fb₂, and Fb₃ chains, several of which shared a similar region to previously reported loci, including DENSE AND ERECT PANICLE 1 (DEP1). The truncated dep1 allele increased Fa, Fb₂, and Fb₃ but decreased Fb₁ in LN, whereas Fa was decreased but Fb₁ and Fb₂ were increased in JS. Elucidating the effects of climate factors and genetic background on APCLD could provide a theoretical basis and technical guidance for high-quality rice breeding.

中文翻译：

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遗传背景和环境条件对亚种间杂交水稻近交重组自交系支链淀粉链长分布的影响。

支链淀粉是必不可少的淀粉特性，支链淀粉（APCLD）的链长分布与大米的食用和烹饪质量密切相关。在这项研究中，一系列的重组近交系衍生自籼稻/粳横种植在四个方面具有独特的生态条件（LN，SC，JS，和GD），和APCLD之间的关系，环境因素，和遗传背景分析。结果表明，APCLD受到环境因素的强烈影响，环境因素从抽穗期到成熟期动态变化。太阳辐射，光通量和光时数与Fa呈正相关，与Fb ₁和Fb ₂呈负相关。。温度与Fa和Fb ₁负相关，但与Fb ₂和Fb ₃正相关。温度是影响APCLD的主要因素，其次是湿度和光线。有是之间没有显著相关籼稻血统比例和APCLD。此外，我们检测到与Fa，Fb ₁，Fb ₂和Fb ₃链相关的六个定量性状基因座，其中几个与以前报道的基因座具有相似的区域，包括DENSE和ERECT PANICLE 1（DEP1）。截短的dep1等位基因增加了Fa，Fb ₂和Fb ₃但LN中Fb ₁降低，而JS中Fa降低，而Fb ₁和Fb ₂升高。阐明气候因素和遗传背景对APCLD的影响可为优质水稻育种提供理论依据和技术指导。