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园艺学报 ›› 2025, Vol. 52 ›› Issue (12): 3303-3321.doi: 10.16420/j.issn.0513-353x.2024-0998

• 栽培·生理生化 • 上一篇    下一篇

施氮对苹果接穗叶片光合和内生菌特性的影响

张换换1, 李旭娇1, 姚东东1, 张光鑫1, 葸金山1, 梁银池1, 赵丰云1, 郁松林1, 王小非2,*(), 于坤1,*()   

  1. 1 石河子大学农学院,新疆生产建设兵团特色果蔬栽培生理与种质资源利用兵团重点实验室,新疆石河子832000
    2 山东农业大学园艺科学与工程学院,作物生物学国家重点试验室,山东果蔬优质高效生产协同创新中心,山东泰安271018
  • 收稿日期:2025-04-02 修回日期:2025-10-13 出版日期:2025-12-25 发布日期:2025-12-20
  • 通讯作者:
    *(E-mail:
  • 基金资助:
    新疆苹果产业技术体系建设专项项目(XJLGCYJSTX04-2024); 新疆生产建设兵团重点科技攻关项目(2024AB038)

Effects of Nitrogen Application on Leaf Photosynthetic and Endophyte Characteristics of Apple Scions

ZHANG Huanhuan1, LI Xujiao1, YAO Dongdong1, ZHANG Guangxin1, XI Jinshan1, LIANG Yinchi1, ZHAO Fengyun1, YU Songlin1, WANG Xiaofei2,*(), YU Kun1,*()   

  1. 1 Key Laboratory of Special Fruits and Vegetables Cultivation Physiology and Germplasm Resources Utilization of Xinjiang Production and Construction Corps,Agricultural College,Shihezi University,Shihezi,Xinjiang 832000,China
    2 Shandong Collaborative Innovation Center for Fruit and Vegetable Production with High Quality and Efficiency,State Key Laboratory of Crop Biology,College of Horticulture Science and Engineering,Shandong Agricultural University,Tai’an,Shandong 271018,China
  • Received:2025-04-02 Revised:2025-10-13 Published:2025-12-25 Online:2025-12-20

摘要:

以新疆野苹果[Malus sieversii(Ledeb.)Roem.]为砧木,分别嫁接新疆野苹果、‘寒富’(Malus × domestica Borkh.‘Hanfu’)和‘富士’(M. × domestica Borkh.‘Fuji’),设不施氮与施氮(0.2 g · kg-1土)处理,采用稳定同位素示踪和高通量测序技术,测定接穗的叶片组织结构、光合特性、碳氮含量和内生菌群落结构的变化特征,探究氮素调控对苹果接穗叶片生理及内生微生物协同适应性的影响机制。结果表明,不施氮条件下‘富士’的叶片厚度、叶绿素含量和碳氮比均显著高于‘寒富’和新疆野苹果;施氮后‘寒富’的叶片净光合速率和气孔导度分别显著提高24.84%和73.86%,且其光合效率显著优于其他两种接穗。叶片内生菌群落分析表明,‘寒富’表现出最高的细菌和真菌群落多样性和丰富度,施氮处理进一步提升了其内生细菌群落的多样性指数(Chao1和Shannon指数分别增加7.30%和61.96%)和网络复杂性(节点数为598,链接数为75 728)。此外,施氮处理显著促进了‘寒富’叶片中功能有益菌属的富集,其中芽孢杆菌属(Bacillus)、新鞘氨醇单胞菌属(Novosphingobium)和鞘氨醇单胞菌属(Sphingomonas)的相对丰度分别较不施氮处理显著提高了226.21%、59.35%和149.42%。综上,氮素施用可显著改善苹果接穗叶片的光合特性并优化内生菌群落结构,其中‘寒富’接穗在氮素充足条件下表现出更优的光合性能和更稳定的内生菌群落。

关键词: 苹果, 新疆野苹果, 接穗, 施氮, 光合特性, 稳定同位素, 内生菌

Abstract:

To explore the mechanisms underlying nitrogen-mediated regulation of scion leaf adaptation,three apple scion varieties—Malus sieversii(Ledeb.)Roem.,‘Hanfu’(M. × domestica Borkh.), and‘Fuji’(M. × domestica Borkh)were grafted onto M. sieversii rootstocks and subjected them to nitrogen-deficient and nitrogen-supplemented(0.2 g · kg-1)conditions. Stable isotope tracing and high-throughput sequencing were employed to analyze variations in leaf tissue structure,photosynthetic characteristics,carbon and nitrogen content,and endophytic microbial communities among the different scion varieties. Under nitrogen-deficient conditions,‘Fuji’scion leaves exhibited significantly greater leaf thickness,chlorophyll content,and carbon-to-nitrogen ratio compared to‘Hanfu’and M. sieversii. Following nitrogen application,‘Hanfu’scion leaves showed a substantial increase in net photosynthetic rate and stomatal conductance by 24.84% and 73.86%,respectively,exhibiting superior photosynthetic efficiency over the other scions. Analysis of endophytic microbial communities revealed that‘Hanfu’scion leaves possessed the highest diversity and richness of bacterial and fungal communities,with nitrogen supplementation further enhancing the diversity indices(Chao1 and Shannon indices increased by 7.30% and 61.96%,respectively)and microbial network complexity(598 nodes and 75 728 edges). Additionally,nitrogen application significantly promoted the enrichment of beneficial functional bacteria in‘Hanfu’scion leaves,with BacillusNovosphingobium,and Sphingomonas increasing in relative abundance by 226.21%,59.35%,and 149.42%,respectively,compared to the nitrogen-deficient condition. In conclusion,nitrogen application significantly improved the photosynthetic performance and optimized the endophytic microbial community structure of apple scion leaves. Among the tested scions,‘Hanfu’exhibited the most pronounced advantages under nitrogen-sufficient conditions,characterized by superior photosynthetic efficiency and a more stable endophytic microbiome. The findings highlight that nitrogen not only enhances the photosynthetic traits of apple scions but also regulates endophytic microbial composition,thereby enhancing environmental adaptability and growth potential.

Key words: apple, Malus sieversii, scions, nitrogen application, photosynthetic characteristics, stable isotopes, endophyte