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林业科学 ›› 2025, Vol. 61 ›› Issue (5): 120-130.doi: 10.11707/j.1001-7488.LYKX20230561

• 研究论文 • 上一篇    下一篇

枣疯病对枣树茎叶水力性状和碳代谢的影响

宋雯1,刘永强1,姚雪宁2,师振萍1,杭宇杰1,郭红彦1,*(),王林1,*()   

  1. 1. 山西农业大学林学院 太谷 030801
    2. 滴灌通科技(深圳)有限公司 深圳 518000
  • 收稿日期:2023-11-22 出版日期:2025-05-20 发布日期:2025-05-24
  • 通讯作者: 郭红彦,王林 E-mail:Ghybjh2004@163.com;lwanger@163.com
  • 基金资助:
    山西省基础研究计划项目(202403021221081;202403021221079)

Effects of Witches’ Broom Disease on Hydraulic Properties and Carbon Metabolism of Jujube Branches and Leaves

Wen Song1,Yongqiang Liu1,Xuening Yao2,zhenping Shi1,Yujie Hang1,hongyan Guo1,*(),Lin Wang1,*()   

  1. 1. College of Forestry, Shanxi Agricultural University Taigu 030801
    2. Micro Connect Technology Shenzhen Co., Ltd Shenzhen 518000)
  • Received:2023-11-22 Online:2025-05-20 Published:2025-05-24
  • Contact: hongyan Guo,Lin Wang E-mail:Ghybjh2004@163.com;lwanger@163.com

摘要:

目的: 研究枣疯病对枣树水力结构和碳代谢的影响,揭示枣疯病的病理机制及其对枣树生理的影响,同时为制定有针对性的管理措施提供理论依据。方法: 以壶瓶枣树为研究对象,测定健康枣树、轻度枣疯病树、重度枣疯病树的叶片和枝条的最大水力学导度(Kmax)、水力脆弱性(P50)和茎叶导水组织的形态解剖特征,并比较3种类型枣树冬春季(11月—次年4月)和生长季(6月)的水势、枝条导水损失率(PLC)、气体交换参数、非结构性碳水化合物(NSC)含量。结果: 随着症状的加重,枣树的枝条和叶片Kmax均明显降低,P50均明显升高,轻度枣疯病树和重度枣疯病树的枝条Kmax较健康枣树分别降低40.75%和80.61%,其叶片Kmax较健康枣树分别降低12.25%和29.44%;轻度枣疯病树和重度枣疯病树的枝条P50较健康枣树分别上升0.18 MPa和0.63 MPa,其叶片P50较健康枣树分别上升0.15 MPa和0.31 MPa。随着病情的加重,枝条导管壁厚度和抗塌陷指数均呈显著降低,重度枣疯病树的枝条木材密度和导管直径均显著低于健康枣树。在冬春季和生长季,随着病情的加重,枝条PLC显著增加,枝条韧皮部含水量、韧皮部细胞活力、枝条韧皮部和木质部NSC含量均显著降低;生长季叶片的光合速率、气孔导度和蒸腾速率均显著降低,轻度枣疯病树和重度枣疯病树的叶净光合速率较健康枣树分别下降25.68%、52.98%。结论: 枣疯病树的枝条和叶片水力学导度降低主要与导管直径减小有关,水力安全性降低主要与导管壁厚度、导管抗塌陷指数和木材密度降低有关,这可能由碳供应不足引起;水分输导能力和安全性降低影响冬春季和生长季的树体水分状况,限制光合作用,造成碳限制,进一步限制枣树的生长和对逆境的适应能力。碳限制和水力限制的共同作用是导致发病枣树生长变差、出现枯死的重要原因。

关键词: 枣疯病, 水力性状, 解剖结构, 非结构性碳水化合物

Abstract:

Objective: This study aims to investigate the effect of witches’ broom disease on the hydraulic architechture and carbon metabolism of jujube trees to reveal the pathophysiological mechanism of witches’ broom disease, so as to provide a theoretical basis for the formulation of targeted management measures. Method: The healthy, mild diseased and severe diseased Ziziphus jujuba cv. ‘Huping’ trees were used as the research object. The maximum hydraulic conductivity (Kmax), hydraulic vulnerability to embolism (P50), and morphological and anatomical characteristics of the jujube branches and leaves were measured. The water potential, branch percentage loss of conductivity (PLC), gas exchange parameters and nonstructural carbohydrates (NSC) contents of the three types of jujube trees in winter-spring period (November to April of the following year) and growing season (June) were also compared. Result: With the aggravation of the disease, the Kmax of the jujube branches and leaves significantly decreased, and the P50 of the branches and leaves significantly increased. The branch Kmax of mild and severe diseased jujube trees was reduced by 40.75% and 80.61%, and the leaf Kmax of mild and severe diseased jujube trees was reduced by 12.25% and 29.44%, respectively, compared to that of healthy jujube trees. The branch P50 of mild and severe diseased jujube trees increased by 0.18 MPa and 0.63 MPa, and the leaf P50 of mild and severe diseased jujube trees increased by 0.15 MPa and 0.31 MPa, respectively, compared to that of healthy jujube trees. With the aggravation of the disease, the thickness of vessel wall and collapse resistance index of the branches decreased significantly, and the wood density and vessel diameter of the branches of the severe diseased trees were significantly lower than those of the healthy ones. During winter-spring period and growing season, with the aggravation of the disease, branch PLC increased significantly, and phloem water content, phloem cell viability, and NSC content in phloem and xylem of branches decreased significantly. The photosynthetic rate, stomatal conductance and transpiration rate of leaves decreased significantly in the growing season, with photosynthetic rate of leaves of mild and severe diseased jujube trees being reduced by 12.25% and 29.44% compared to that of healthy jujube trees, respectively. Conclusion: The decrease in maximum hydraulic conductivity of leaves and branches is mainly related to the decrease of vessel diameter, and the decrease in hydraulic safety is mainly related to the decrease of vessel wall thickness, vessel collapse resistance and wood density, which may be caused by insufficient carbon supply. The decrease in water transport capacity and safety affects the water status of trees in the winter-spring period and growing seasons, limiting photosynthesis and resulting in carbon limitation, which further constrains the growth and the adaptability of jujube trees to adversity. Hydraulic limitation and carbon limitation are an important reason for the poor growth and dieback of diseased jujube trees.

Key words: witches’ broom disease, hydraulic traits, anatomic structure, nonstructural carbohydrates

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