JEB logo

Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

About Journal
    Home
    Obituary: Dr. R. C. Dalela
    Editorial Board
    Reviewer Panel
    Publication Policies
    Guidelines for Editors
    Guidelines for Reviewers
    Abstracting and Indexing
    Subscription and Payments
    Contact Journal
    About Triveni Enterprises
 
Read Journal
    Current Issue
    Journal Archives
 
For Authors
    Guidelines for Authors
    Terms and Conditions
    Fees and Payments
    Track Paper Status
 

Google Search the Journal web-site:


    Abstract - Issue Jul 2010, 31 (4)                                     Back


Abstract _19

Gas exchange in Paulownia species growing under different

soil moisture conditions in the field

 

J.M. Llano-Sotelo1, L. Alcaraz-Melendez*2 and A.E. Castellanos Villegas3

1,2 Centro de Investigaciones Biologicas del Noroeste (CIBNOR) Apdo. Postal 128 La Paz, B.C.S. 23000, M?xico

3 Departamento de? Investigaciones Cient?ficas y Tecnol?gicas de la Universidad de Sonora (DICTUS),

Apdo. Postal 1819, Hermosillo, Sonora, M?xico

(Received: September 26, 2008; Revised received: December 10, 2008; Accepted: January 01, 2009)

 

Abstract: In order to evaluate their responses to drought, we determined the photosynthetic activity, water potential, stomatal conductance, transpiration, water use efficiency, photosynthetic photon flux density and leaf temperature of Paulownia imperialis, P. fortunei and P. elongata in three different soil moisture conditions in the field. Our results showed that P. imperialis had greater photosynthesis (8.86 ?mol CO2 m-2 s-1) and instantaneous water use efficiency (0.79 ?mol CO2mmol H2O-1) than either P. elongata (8.20 ?mol CO2 m-2 s-1 and 0.71 ?mol CO2 mmol H2O-1) or P. fortunei (3.26 ?mol CO2m-2 s-1and 0.07 ?mol CO2mmol H2O-1). The rapid growth of Paulownia did not appear to be correlated with photosynthetic rates. Paulownia fortunei showed more transpiration (48.78 mmol H2O m-2? s-1) and stomatal conductance (840 mmol m-2? s-1) than P. imperialis (20 mmol H2O m-2 s-1 and 540 mmol m-2 s-1) and P. elongata (20 mmol? H2O m-2 ?s-1 and 410 mmol m-2? s-1), which allowed these two Paulownia species to increase their tolerance to low soil moisture, and maintain higher water use efficiency under these conditions. According to our physiological gas exchange field tests, Paulownia imperialis does appear to be capable of successful growth in semiarid zones.

Key words: Paulownia, Drought, Photosynthesis, Gas exchange, Stomatal conductance

??????? PDF of full length paper is available online

 

Copyright ? 2010 Triveni Enterprises. All rights reserved. No part of the Journal can be reproduced in any form without prior permission. Responsibility regarding the authenticity of the data, and the acceptability of the conclusions enforced or derived, rest completely with the author(s).