Tree height and not climate influences intraspecific variations in wood parenchyma fractions of angiosperm species in a mountain forest of eastern China

IF 2.4 2区生物学 Q2 PLANT SCIENCES

American Journal of Botany Pub Date : 2025-04-28 DOI:10.1002/ajb2.70035

Dan Wu, Xinni Zhou, Jinqi Wang, Hugh Morris, Xijin Zhang, Kun Song

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引用次数: 0

Abstract

Premise

Parenchyma is an important cell type in the secondary xylem of angiosperm trees, with considerable variability in its abundance. However, the functional significance of these variations and their roles in plant ecological strategies is poorly understood at the inter- and intraspecific levels.

Methods

For this study, fractions of axial parenchyma cells (AP) and ray parenchyma cells (RP) in xylem tissue were quantified for 156 individuals of 45 tree species along an elevational gradient from 600 to 1600 m a.s.l. in eastern China. Environmental factors and height of sampled trees at each sampling site were also measured. Linear mixed models were employed to assess the relative extent of both intraspecific and interspecific variations in parenchyma cells in xylem tissue fractions and to identify intraspecific variations along environmental gradients (e.g., temperature and humidity) and tree heights.

Results

Interspecific variations explained the large diversity in AP fractions. Conversely, intraspecific variations accounted for ~50% of the overall variations in RP fractions. Further, intraspecific variations in the RP and the total AP and RP fractions exhibited negative correlations with tree heights but showed no significant relationship with climate.

Conclusions

Intraspecific variations in parenchyma cells in xylem tissue fractions are not necessarily an adaptation or acclimation to changes in the environment but are coordinated with tree heights.

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中国东部山地森林被子植物种内木材薄壁组织组分的变化受树高而非气候的影响。

前提：薄壁细胞是被子植物次生木质部的重要细胞类型，其丰度具有相当大的差异性。然而，在种间和种内水平上，这些变异的功能意义及其在植物生态策略中的作用尚不清楚。方法：对中国东部海拔600 ~ 1600 m的45种树种156株木质部轴向薄壁细胞（AP）和射线薄壁细胞（RP）的含量进行了定量分析。测量了各样点的环境因子和样树高度。采用线性混合模型来评估木质部组织中薄壁细胞种内和种间变异的相对程度，并确定沿环境梯度（如温度和湿度）和树高的种内变异。结果：种间差异解释了AP组分的巨大差异。相反，种内变异占RP分数总变异的约50%。此外，RP和总AP和RP分数的种内变化与树高呈负相关，而与气候无显著相关。结论：木质部薄壁细胞的种内变异不一定是对环境变化的适应或驯化，而是与树高协调一致的。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

American Journal of Botany 生物-植物科学

CiteScore

4.90

自引率

6.70%

发文量

171

审稿时长

3 months

期刊介绍： The American Journal of Botany (AJB), the flagship journal of the Botanical Society of America (BSA), publishes peer-reviewed, innovative, significant research of interest to a wide audience of plant scientists in all areas of plant biology (structure, function, development, diversity, genetics, evolution, systematics), all levels of organization (molecular to ecosystem), and all plant groups and allied organisms (cyanobacteria, algae, fungi, and lichens). AJB requires authors to frame their research questions and discuss their results in terms of major questions of plant biology. In general, papers that are too narrowly focused, purely descriptive, natural history, broad surveys, or that contain only preliminary data will not be considered.