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Quantifying high-temperature-induced reproductive growth imbalance in citrus at anthesis: Insights from the CF-ASPM model

文献类型： 外文期刊

作者： Qiu, Xia 1 ; Zhu, Feiyu 1 ; Huang, Ping 1 ; Chen, Hongwen 1 ; Li, Yali 1 ; Pu, Changbing 1 ; Li, Zongnan 1 ; Zhong, Dan 1 ; Xiang, Chao 3 ; Chen, Jin 4 ; Wang, Si 1 ;

作者机构： 1.Sichuan Acad Agr Sci, Inst Remote Sensing & Digital Agr, Chengdu 610066, Peoples R China

2.Sichuan Acad Agr Sci, Sci & Technol Ctr Intelligent Agr, Chengdu 610066, Peoples R China

3.Sichuan Acad Agr Sci, Crop Res Inst, Chengdu 610066, Peoples R China

4.Beijing Normal Univ, Inst Remote Sensing Sci & Engn, Fac Geog Sci, State Key Lab Remote Sensing Sci, Beijing 100875, Peoples R China

关键词： Citrus flower; High-temperature stress; Quantitative phenotype; CF-ASPM; Reproductive growth imbalance

期刊名称：COMPUTERS AND ELECTRONICS IN AGRICULTURE （ 影响因子：8.9； 五年影响因子：9.3 ）

ISSN： 0168-1699

年卷期： 2025 年 236 卷

页码：

收录情况： SCI

摘要： Global climate change-induced environmental stress poses critical challenges to the stable development of economic crops such as citrus. High temperatures (HTs) at anthesis may cause poor pollination and excessive flower/fruit drop, seriously affecting fruit yield and quality. To comprehensively analyze the developmental dynamics and morphological responses of citrus to HT stress at anthesis, methods for precise whole-flower phenotypic extraction and stamen state classification were developed. A citrus flower automatic segmentation and phenotypic quantitative model (CF-ASPM) that combines the pre-trained Segment Anything Model (SAM) with a lightweight classification module was constructed to accurately identify and quantify key citrus flower structures. Phenotypic parameter extraction correlation coefficients were 0.90-0.98. A few-shot stamen classification method was also designed using a pre-segmentation strategy and differential features, and its classification accuracy was 96.39%. Experiments with Ehime mandarin were conducted to analyze dynamic citrus floral organ changes at different temperatures and the underlying physiological mechanisms. The results showed that citrus exhibits a distinct reproductive priority strategy under HTs. Floral organ growth is inhibited, blooming is accelerated, and an asynchronous compensation mechanism occurs between male and female organs. HTs accelerated flower aging and caused developmental imbalances in the ovary and nectar disc. This may lead to increased flower and fruit drop and altered fruit shape. This study revealed the reproductive priority strategy and growth imbalance of citrus floral organs under HTs using the CF-ASPM model. It provides important data for further exploring the molecular mechanisms and management strategies of HT stress.

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