干旱复水对沙地樟子松水力和碳同化特征的影响  

Effects of drought and rehydration on the hydraulic and carbon assimilation characteristics of Pinus sylvestris var.mongolica

作　　者：于雅凡 万龙燕 邓继峰[1,2] 苏芳莉 YU Yafan;WAN Longyan;DENG Jifeng;SU Fangli(College of Forestry,Shenyang Agricultural University,Shenyang 110866,China;Key Laboratory of Forest Tree Genetics and Breeding of Liaoning Province,Shenyang 110866,China)

机构地区：[1]沈阳农业大学林学院,沈阳110866 [2]辽宁省林木遗传育种与培育重点实验室,沈阳110866

出　　处：《植物生理学报》2025年第3期309-324,共16页Plant Physiology Journal

基　　金：国家自然科学基金(31800609)。

摘　　要：为了探究沙地樟子松在水分胁迫下的抗旱机理和复水后的恢复程度,阐明在干旱复水下樟子松叶、茎和根的水力性状之间以及与碳同化特征之间的调节和权衡关系,以树龄3年的盆栽樟子松幼苗为试验对象进行试验。结果表明:持续干旱抑制樟子松生长,根冠比升高,干旱45 d后复水恢复程度最低。干旱胁迫下樟子松为非等水水分调节对策,叶、茎、根水势出现脱耦现象。干旱胁迫下樟子松幼苗P_(n)、T_(r)、G_(s)、C_(i)、F_(v)/F_(m)、ΦPSⅡ、q_(P)均呈下降趋势,NPQ呈上升趋势;叶绿素含量先上升后下降,除干旱45 d后复水组外其他处理组均呈现较强的恢复能力。干旱胁迫下樟子松抗氧化酶(POD、SOD、CAT)活性先升高再下降,相对电导率上升,干旱45 d后复水部分指标暂未恢复至正常水平。干旱会导致非结构性碳水化合物(NSC)在不同器官中的分配差异,在干旱前期可溶性糖主要用于渗透调节和生理活动,在干旱加剧时植株将更多的淀粉分解为可溶性糖,在干旱后期各器官中可溶性糖、淀粉主要呈下降趋势,植株通过消耗储存的NSC以维持生存。干旱45 d后复水的恢复效果不明显,且茎、根部淀粉的消耗主要用于水力系统的复原与重构。In this study,3-year-old potted Pinus sylvestris var.mongolica seedlings were conducted as experimental subjects to explore the drought resistance mechanism under water stress and the degree of recovery after rehydration.The regulatory and balancing relationships between the hydraulic properties of leaves,stems,and roots of P.sylvestris var.mongolica,as well as their carbon assimilation characteristics under drought rehydration were also elucidated.The results indicated that continuous drought inhibited the growth of P.sylvestris var.mongolica,the root/shoot ratio increased significantly.The recovery degree was the lowest after 45 days of drought.Under drought stress,P.sylvestris var.mongolica take a non-equal water regulation strategy,resulting in decoupling of water potential in leaves,stems,and roots.Under drought stress,the P_(n),T_(r),G_(s),C_(i),F_(v)/F_(m),ΦPSII,and q_(P)of P.sylvestris var.mongolica seedlings showed a decreasing trend,while NPQ showed an increasing trend.The chlorophyll content first increased and then decreased,with all treatment groups showing strong recovery ability except for the rehydration group after 45 days of drought.Under drought stress,the activities of antioxidant enzymes(POD,SOD,CAT)in P.sylvestris var.mongolica first increased and then decreased,and the relative conductivity increased.After 45 days of drought and rehydration,some of the indicators in the rehydration group have not yet returned to normal levels.Drought can lead to differences in the distribution of non-structural carbohydrates(NSC)in different organs.In the early stages of drought,soluble sugars are mainly used for osmotic regulation and physiological activities.As drought intensifies,plants break down more starch into soluble sugars.In the later stages of drought,soluble sugars and starch in various organs mainly show a decreasing trend.Plants maintain their survival by consuming stored NSC.The recovery effect of rehydration after 45 days of drought is not significant,and the consumption of starch in stems

关 键 词：干旱 复水 水力性状 生理生化响应 樟子松 

分 类 号：S718.43[农业科学—林学]