Xylem embolism induced by freeze-thaw and drought are influenced by different anatomical traits in subtropical montane evergreen angiosperm trees.

IF 5.4 2区 生物学 Q1 PLANT SCIENCES
Feng Zhang, Yi-Wen Liu, Jie Qin, Steven Jansen, Shi-Dan Zhu, Kun-Fang Cao
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引用次数: 0

Abstract

Subtropical evergreen broadleaved forests distributed in montane zones of southern China experience seasonal droughts and winter frost. Previously, studies have recognized that xylem anatomy is a determinant of its vulnerability to embolism caused by drought and freezing events. We hypothesized that there is a coordination of xylem resistance to freeze-thaw and drought-induced embolism for the subtropical montane evergreen broadleaved tree species because they are influenced by common xylem structural traits (e.g., vessel diameter). We examined the branch xylem anatomy, resistance to drought-induced embolism (P50), and the percent loss of branch hydraulic conductivity after a severe winter frost (PLCwinter) for 15 evergreen broadleaved tree species in a montane forest in South China. Our results showed that P50 of the studied species ranged from -2.81 to -5.13 MPa, which was not associated with most xylem anatomical properties except for the axial parenchyma-to-vessel connectivity. These tree species differed substantially in PLCwinter, ranging from 0% to 76.41%. PLCwinter was positively related to vessel diameter and negatively related to vessel density, vessel group index, and vessel-to-vessel connectivity, but no coordination with P50. This study suggests that hydraulic adaptation to frost is important to determine the distributional limit of subtropical montane evergreen woody angiosperms.

冻融和干旱引起的木质部栓塞受亚热带山地常绿被子植物不同解剖特征的影响。
分布在中国南方山地地区的亚热带常绿阔叶林会经历季节性干旱和冬季霜冻。以前的研究已经认识到木质部的解剖结构决定了它对干旱和冰冻事件引起的栓塞的脆弱性。我们假设,亚热带山地常绿阔叶树种木质部对冻融和干旱引起的栓塞的抗性是相互协调的,因为它们受到共同的木质部结构特征(如血管直径)的影响。我们研究了华南山地森林中 15 个常绿阔叶树种的枝条木质部解剖结构、抗旱栓塞能力(P50)以及严冬霜冻(PLCwinter)后枝条导水性损失的百分比。结果表明,所研究树种的P50介于-2.81至-5.13 MPa之间,除了轴向实质与血管的连通性外,与大多数木质部解剖特性无关。这些树种在 PLCwinter 方面差异很大,从 0% 到 76.41% 不等。PLCwinter 与血管直径呈正相关,与血管密度、血管组指数和血管间连接呈负相关,但与 P50 无关。这项研究表明,水力对霜冻的适应性对于确定亚热带山地常绿木本被子植物的分布界限非常重要。
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来源期刊
Physiologia plantarum
Physiologia plantarum 生物-植物科学
CiteScore
11.00
自引率
3.10%
发文量
224
审稿时长
3.9 months
期刊介绍: Physiologia Plantarum is an international journal committed to publishing the best full-length original research papers that advance our understanding of primary mechanisms of plant development, growth and productivity as well as plant interactions with the biotic and abiotic environment. All organisational levels of experimental plant biology – from molecular and cell biology, biochemistry and biophysics to ecophysiology and global change biology – fall within the scope of the journal. The content is distributed between 5 main subject areas supervised by Subject Editors specialised in the respective domain: (1) biochemistry and metabolism, (2) ecophysiology, stress and adaptation, (3) uptake, transport and assimilation, (4) development, growth and differentiation, (5) photobiology and photosynthesis.
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