Assessing vulnerability to embolism and hydraulic safety margins in reed-like Restionaceae

IF 4.2 3区 生物学 Q1 PLANT SCIENCES Plant Biology Pub Date : 2024-04-08 DOI:10.1111/plb.13644
A. G. West, K. Atkins, J. J. van Blerk, R. P. Skelton
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评估芦苇科植物易受栓塞影响的程度和水力安全系数
非洲禾本科植物(Poales)是南非开普花卉区的主要禾本科植物层,分布于各种湿度条件下,但目前人们对这一群体的基本水力学知之甚少。我们在从半旱生(Cannomois virgata)到旱地(Cannomois parviflora 和 C. congesta)的三个物种中测试了两种测量茎秆易受栓塞影响程度的方法:光学方法和气动方法。茎秆木质部易损性的估计值与张力损失点(ΨTLP)和最小田间水势(ΨMD)的测量值相结合,以评估水力安全系数。光学方法和气动方法对 P50 的估计值相似,但对 P12 和 P88 的估计值不同。这三个物种都很容易发生栓塞,P50分别为-1.9 MPa(C. virgata)、-2.3 MPa(C. congesta)和-2.4 MPa(C. parviflora)。P50、ΨTLP 和 ΨMD 的估计值与栖息地的湿度胁迫一致,半旱生植物 C. virgata 的估计值最高。物种间 P50、ΨMD 和 ΨTLP 的一致差异导致物种间ΨMD 和 P50 之间的水力安全裕度一致为 0.96 ± 0.1 兆帕,所有三个物种的栓塞发生时间都在ΨTLP 之后 0.43 ± 0.04 兆帕。我们的研究表明,restio对干旱环境的适应不仅仅涉及高抗性木质部的进化,还表明水分关系的其他方面是理解该类植物性状与环境关系的关键。
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来源期刊
Plant Biology
Plant Biology 生物-植物科学
CiteScore
8.20
自引率
2.60%
发文量
109
审稿时长
3 months
期刊介绍: Plant Biology is an international journal of broad scope bringing together the different subdisciplines, such as physiology, molecular biology, cell biology, development, genetics, systematics, ecology, evolution, ecophysiology, plant-microbe interactions, and mycology. Plant Biology publishes original problem-oriented full-length research papers, short research papers, and review articles. Discussion of hot topics and provocative opinion articles are published under the heading Acute Views. From a multidisciplinary perspective, Plant Biology will provide a platform for publication, information and debate, encompassing all areas which fall within the scope of plant science.
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