首页|不同微生境两种滨藜属灌丛木质部的结构与功能

不同微生境两种滨藜属灌丛木质部的结构与功能

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两种以前广泛分布的滨藜属(Atriplex)物种如今在南加州圣华金河谷沙漠的一系列微栖息地中以碎片化的种群出现.我们推测,由于土壤盐度和干旱程度的不同,大滨藜(A.lentiformis)和多果滨藜(A.polycarpa)在叶片和茎的结构和功能性状上存在种间和种内差异.我们比较了3个大滨藜种群和4个多果滨藜种群的水势、木质部结构功能和叶片性状.两个物种的木质部性状差异显著,其中大滨藜的木质部密度较低,导管平均直径和最大直径较宽,导水率较高.这两个物种的叶片性状也具有显著差异,其中大滨藜与多果滨藜相比,具有更大的叶片和更高的比叶面积.叶片性状在大滨藜不同种群间存在显著差异.相反,茎木质部结构特征(平均管壁厚度、平均管径和最大管长)在多果滨藜不同种群间存在差异.这些差异在很大程度上与大滨藜的土壤盐度有关,而与多果滨藜的季节性水势关系不大.总体而言,两种滨藜属灌木均表现出较高的种内和种间性状变异.这可能是理解这些本地物种进化的关键考虑因素,对它们的保护和恢复具有重要意义.
Xylem structure and function of two saltbush shrub species(Atriplex)from differing microhabitats
Two formerly broadly distributed woody Atriplex species now occur as fragmented populations across a range of microhabitats in the San Joaquin Valley Desert,southern California.We hypothesized that A.lentiformis and A.polycarpa exhibit inter-and intra-specific differences in their leaf and stem structural and functional traits corresponding with differences in soil salinity and aridity.Water potential,xylem structure and function and leaf traits were compared between three populations of A.lentiformis and four populations of A.polycarpa.The two species significantly differed in their xylem traits,with A.lentiformis displaying lower xylem density,wider mean and maximum vessel diameters and higher hydraulic conductivity(Ks).They also differed in their leaf traits,such that A.lentiformis had larger leaves with higher specific leaf area(SLA)than A.polycarpa.Significant intra-specific differences occurred among leaf traits(leaf area,SLA)in A.lentiformis populations.In contrast,populations varied in their stem xylem structural traits(mean vessel wall thickness,mean vessel diameter,maximum vessel length)among A.polycarpa populations.Many of these differences were associated with soil salinity in A.lentiformis,and with minimum seasonal water potential in A.polycarpa.Overall,both saltbush species showed high intra-and inter-specific trait variation.This could be a critical consideration in understanding the evolution of these native species and has important implications for their conservation and restoration.

ariditydroughtleaf areaspecific hydraulic conductivitySan Joaquin Valley Desertwater potentialxylem anatomy

Mustapha Ennajeh、Mitchell Coleman、Jaycie C.Fickle、Viridiana Castro、Robert Brandon Pratt、Anna L.Jacobsen

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Department of Biology,California State University,Bakersfield,CA 93311,USA

Laboratory of Biodiversity and Valorization of Bioresources in Arid Zones,Faculty of Sciences of Gabes,University of Gabes,6072 Gabes,Tunisia

Tejon Ranch Conservancy,Frazier Park,CA 93225,USA

干旱 叶面积 比水导电率 圣华金河谷沙漠 水势 木质部解剖

National Science Foundation of United States of AmericaNational Science Foundation of United States of AmericaNational Science Foundation of United States of AmericaNational Science Foundation of United States of AmericaFulbright Fellowship for ME

CREST HRD-1547784 supporting R.B.P.A.L.J.J.C.F.V.CFulbright Visiting Scholar Program 2018

2023

10.1093/jpe/rtad022

植物生态学报(英文版)

植物生态学报(英文版)

CSCD
ISSN：1752-9921
年,卷(期)：2023.(6)
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