Chinese Journal OF Rice Science ›› 2025, Vol. 39 ›› Issue (5): 679-689.DOI: 10.16819/j.1001-7216.2025.241014

• Research Papers • Previous Articles     Next Articles

Effect of Low Temperature at Booting Stage on Photosynthetic System of Different Rice Materials in Cold Region

DING Guohua1, 3, #, LI Xin2, #, CAO Liangzi1, ZHOU Jinsong1, LEI Lei1, BAI Liangming1, LUO Yu1,

YANG Guang1, CUI Zhibo3, ZHAO Minghui3, *, SUN Shichen1, *   

  1. 1Institute of Crop Cultivation and Tillage, Heilongjiang Academy of Agricultural Sciences/Heilongjiang Engineering Technology Research Center of Rice Quality Improvement and Genetic Breeding/ Heilongjiang Provincial Key Laboratory of Crop Physiology and Ecology in Cold Region, Harbin 150086, China; 2College of Agriculture, Northeast Agricultural University, Harbin 150030, China; 3Collaborative Innovation Center for Genetic Improvement and High Quality and Efficiency Production of Northeast Japonica Rice in China, Shenyang Agricultural University, Shenyang 110866, China; 
  • Received:2024-10-31 Revised:2025-03-25 Online:2025-09-10 Published:2025-09-10
  • Contact: ZHAO Minghui, SUN Shichen

孕穗期低温对寒地不同水稻材料光合系统的影响研究

丁国华1, 3, # 李鑫2, # 曹良子1 周劲松1 雷蕾1 白良明1 洛育1 杨光1 崔志波3 赵明辉3, * 孙世臣1, *   

  1. 1 黑龙江省农业科学院 耕作栽培研究所/黑龙江省水稻品质改良与遗传育种工程技术研究中心/黑龙江省寒地作物生理生态重点实验室,哈尔滨 150086;2东北农业大学 农学院,哈尔滨 150030;3沈阳农业大学 东北粳稻遗传改良与优质高效生产省部共建协同创新中心,沈阳 110866;
  • 通讯作者: 赵明辉, 孙世臣
  • 基金资助:

    黑龙江省省属科研业务费项目(CZKYF2023-1-C012);沈阳农业大学东北粳稻遗传改良与优质高效生产省部共建协同创新中心开放课题)(KF2022-04);国家水稻产业技术体系专项(CARS-01-62);黑龙江省农业科学院创新工程资助项目(CX23ZD02)。

Abstract: 【Objective】The study aims to analyze the reasons for differences in photosynthetic system response to low temperature of early maturing rice materials at booting stage in cold regions, and to provide theoretical and material basis for breeding cold-tolerant and high-yield rice varieties at booting stage.【Method】 Using high-quality cold-tolerant variety Longdao 18 (LD18) and the new cold-sensitive high-yielding germplasm Longdao 17029 (L9) derived from crosses between LD18 and upland rice as experimental materials, we studied the effects of chilling injury on flag leaf chloroplast ultrastructure, photosynthetic parameters, related enzyme activities, and gene expression in materials with different cold tolerance.【Result】 Genomic analysis showed 75.03% similarity between LD18 and L9, with major differences on chromosomes 2 and 5. Under low temperature during booting-stage, LD18 had a significantly lower unfilled grain rate than L9. The SPAD value and chloroplast ultrastructure of LD18 flag leaves showed no significant changes, while L9 exhibited significantly decreased SPAD value, swollen and distorted chloroplasts and thylakoids, and produced abundant osmiophilic granules. Photosynthetic-related enzyme activities were higher in LD18 than those in L9. Transcriptomic and RT-qPCR results indicated more differentially expressed genes in LD18 than in L9. GO and KEGG analyses revealed that the most enriched pathways in LD18 versus L9 included photosynthesis and chlorophyll metabolism. RT-qPCR showed 3-fold upregulation of the photosynthesis-related gene RBCX1 in LD18 but downregulation in L9.【Conclusion】At booting stage under low temperature, LD18 exhibits stronger cold tolerance than L9. LD18 can mobilize more genes to cope with low-temperature stress, maintain chloroplast structural integrity, avoid reduction in chlorophyll content and photosynthetic rate, and maintain higher photosynthetic enzyme activities.

Key words:

"> chilling injury, booting stage, physiological trait, photosynthesis, transcriptome

摘要: 【目的】解析龙稻18(LD18)和龙稻17029(L9)孕穗期光合系统对低温反应差异,为培育孕穗期耐冷高产水稻品种提供理论依据。【方法】以优质耐冷品种LD18和其与旱稻创制的高产冷敏感新种质L9为试验材料,利用人工气候室研究了孕穗期低温冷害对不同耐冷材料剑叶叶绿体超微结构、光合参数、相关酶活性及基因表达的影响。【结果】测序分析表明,LD18和L9基因组相似程度为75.03%,大的差异片段主要在2号、5号染色体。孕穗期低温下,LD18空壳率显著低于L9,LD18剑叶叶色值和叶绿体超微结构变化不明显,L9叶色值显著降低, 叶绿体和类囊体出现膨大、变形,并产生了大量嗜锇粒,LD18光合相关酶活性高于L9。转录组及RT-qPCR结果表明,LD18差异表达基因数多于L9;GO和KEGG分析显示,LD18和L9相比最富集的基因通路包括光合作用和叶绿素代谢; RT-qPCR分析结果表明光合相关基因RBCX1在LD18中上调表达3倍,而在L9中下调表达。【结论】孕穗期低温下,LD18比L9具有更强的耐冷性,LD18能够调动更多基因应对低温胁迫,保持叶绿体结构完整,不降低叶绿素含量及光合速率,光合相关酶活性更高。

关键词:

"> 冷害, 孕穗期, 生理性状, 光合作用, 转录组