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The vulnerability to freezing-induced xylem cavitation of Larrea tridentata (Zygophyllaceae) in the Chihuahuan desert.

Abstract：

:The temperature dependence of freezing-induced xylem cavitation was studied in a Chihuahuan desert population of Larrea tridentata (Zygophyllaceae). Field measurements of wood temperature and xylem embolism were combined with anatomical studies and laboratory measurements of embolism in stem and root samples frozen under controlled conditions. Our laboratory experiments corroborated the previously observed relationship between minimum freezing temperature and embolism. The area of the low-temperature exotherms produced during the freezing treatments was correlated with the resulting embolism, suggesting that the freezing of water inside parenchyma cells is associated with the occurrence of xylem embolism. In the laboratory experiments, embolism in stems increased only at temperatures below -14°C. Although this meant that the studied population was more resistant to freezing-induced xylem embolism than a previously studied population from the Sonoran desert, the impact of freezing was nevertheless greater because of much lower environmental temperatures. This result suggests that dieback associated with periodic extreme freezes may contribute to limiting the present distribution of L. tridentata in central New Mexico. Although laboratory experiments showed that root xylem embolism increased after freezing to less negative minimum temperatures than stems (significant effects at T = -7°C), root embolism in the field was lower than shoot embolism in accordance with measured soil temperatures throughout the study.

journal_name

Am J Bot

journal_title

American journal of botany

authors

Martínez-Vilalta J,Pockman WT

doi

10.3732/ajb.89.12.1916

subject

Has Abstract

pub_date

2002-12-01 00:00:00

pages

1916-24

issue

12

eissn

0002-9122

issn

1537-2197

pii

89/12/1916

journal_volume

89

pub_type

杂志文章

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