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Cavitation resistance of peduncle, petiole and stem is correlated with bordered pit dimensions in Magnolia grandiflora

journal contribution
posted on 2023-05-24, 04:24 authored by Zhang, FP, Zhang, JL, Timothy BrodribbTimothy Brodribb, Hu, H
Variation in resistance of xylem to embolism among flowers, leaves, and stems strongly influences the survival and reproduction of plants. However, little is known about the vulnerability to xylem embolism under drought stress and their relationships to the anatomical traits of pits among reproductive and vegetative organs. In this study, we investigated the variation in xylem vulnerability to embolism in peduncles, petioles, and stems in a woody plant, Magnolia grandiflora. We analyzed the relationships between water potentials that induced 50% embolism (P50) in peduncles, petioles, and stems and the conduit pit traits hypothesized to influence cavitation resistance. We found that peduncles were more vulnerable to cavitation than petioles and stems, supporting the hypothesis of hydraulic vulnerability segmentation that leaves and stems are prioritized over flowers during drought stress. Moreover, P50 was significantly correlated with variation in the dimensions of inter-vessel pit apertures among peduncles, petioles and stems. These findings highlight that measuring xylem vulnerability to embolism in reproductive organs is essential for understanding the effect of drought on plant reproductive success and mortality under drought stress.

History

Publication title

Plant Diversity

Volume

43

Issue

4

Pagination

324-330

ISSN

2468-2659

Department/School

School of Natural Sciences

Publisher

Zhongguo Kexueyuan Kunming Zhiwu Yanjiusuo

Place of publication

China

Repository Status

  • Restricted

Socio-economic Objectives

Assessment and management of terrestrial ecosystems; Understanding the impact of natural hazards caused by climate change