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Accueil du site → Master → Etats Unis → 1997 → Seasonal xylem-conducting ability in the desert shrub Chilopsis linearis

University of Nevada, Las Vegas (1997)

Seasonal xylem-conducting ability in the desert shrub Chilopsis linearis

Dudek, Judith Michele

Titre : Seasonal xylem-conducting ability in the desert shrub Chilopsis linearis

Auteur : Dudek, Judith Michele

Université de soutenance : University of Nevada, Las Vegas,

Grade : Master of Science (MS) 1997

Résumé
Chilopsis linearis, a facultative phreatophyte, is a shrub that is common along washes in arid environments like the Mojave Desert. In addition to adaptive drought tolerant and drought avoidance mechanisms, internal anatomical and developmental characteristics such as vessel diameter, number of vessels produced and the season of the year they are produced affect the conducting ability of xylem to transport water to the leaves. Xylem conductance measurements indicated that no more than half of the vessels in C. linearis are conducting in either a dry year (1994) or a wet year (1995). This was likely due to the obstruction of some xylem conduits by emboli (air bubbles) as a result of possible stress. The loss of functioning vessels by embolism is balanced by the production of new vessels throughout the growing season, thus maintaining the conducting ability of the plant stem.

Mots Clés : Phreatophytes — Nevada — Mojave Desert. Phreatophytes — California — Mojave Desert. Xylem — Transpiration.

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Page publiée le 3 janvier 2015, mise à jour le 19 décembre 2018