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Xylem cavitation isolates leaky flowers during water stress in pyrethrum

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Bourbia, I, Carins-Murphy, MR ORCID: 0000-0003-4370-9485, Gracie, AJ ORCID: 0000-0001-5139-9822 and Brodribb, TJ ORCID: 0000-0002-4964-6107 2020 , 'Xylem cavitation isolates leaky flowers during water stress in pyrethrum' , New Phytologist, vol. 227, no. 1 , pp. 146-155 , doi: 10.1111/nph.16516.

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Abstract

Flowers underpin plant evolution, genetic legacy and global food supply. They are exposed to similar evaporative conditions as leaves, yet floral physiology is a product of different selective forces. We used Tanacetum cinerariifolium , a perennial daisy, to examine the response of flowers to whole‐plant water stress, determining if flowers constitute a liability during drought, and how this species has adapted to minimize risk associated with reproduction.We determined the relative transpiration cost of flowers and leaves and confirmed that flowers in this species are xylem‐hydrated. The relative water stress tolerance of leaves and flowers then was compared using xylem vulnerability measurements linked with observed tissue damage during an acute drought treatment.Flowers were a major source of water loss during drought but the xylem supplying them was much more vulnerable to cavitation than leaves. This xylem vulnerability segmentation was confirmed by observations that most flowers died whereas leaves were minimally affected during drought.Early cavitation and hydraulic isolation of flowers during drought benefits the plant by slowing the dehydration of perennial vegetative organs and delaying systemic xylem damage. Our results highlight the need to understand flower xylem vulnerability as a means of predicting plant reproductive failure under future drought.

Item Type: Article
Authors/Creators:Bourbia, I and Carins-Murphy, MR and Gracie, AJ and Brodribb, TJ
Keywords: flower hydraulic traits, hydraulic conductance, minimum conductance, vulnerability segmentation, xylem embolism
Journal or Publication Title: New Phytologist
Publisher: Blackwell Publishing Ltd
ISSN: 0028-646X
DOI / ID Number: 10.1111/nph.16516
Copyright Information:

Copyright 2020 The Authors. New Phytologist Copyright 2020 New Phytologist Trust

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