J Integr Plant Biol. ›› 2007, Vol. 49 ›› Issue (10): 1470-1477.DOI: 10.1111/j.1672-9072.2007.00561.x

Special Issue: Abiotic Stresses

• Research Articles • Previous Articles     Next Articles

Photosynthesis and Water Use Efficiency of Platycladus Orientalis and Robinia Pseudoacacia Saplings under Steady Soil Water Stress during Different Stages of Their Annual Growth Period

Ming-Chun Wang, Jin-Xin Wang, Qing-Hua Shi and Jin-Song Zhang   

  • Published:2007-10-10

Abstract: A simulated drought experiment was conducted in a rain-free shed to test the physiological response of Platycladus orientalis and Robinia pseudoacacia saplings to steady soil water stress during different stages. The five soil water treatments were: 100%, 87.84%, 70%, 52.16% and 40% of field capacity. The results showed that the net photosynthetic rate of R. pseudoacacia decreased as soil water potential decreased in the range between −0.041 MPa and –0.292 MPa. The threshold value at which the net photosynthetic rate changed significantly was −0.12 MPa. The relationship between net photosynthetic rate of P. orientalis and soil water potential could be described as a quadratic parabola in the range between −0.041 MPa and −0.648 MPa. Analysis of variance showed significant differences in the net photosynthetic rate of P. orientalis between soil water potentials of −0.061 MPa −0.648 MPa. Average water use efficiency (WUE) increased as soil water potential decreased, but the influence mechanism of soil water stress on leaf WUE and photosynthetic rate for the two species were different evidently.

Key words: growth stages, photosynthesis, Platycladus orientalis, Robinia pseudoacacia, sapling, steady water stress, water use efficiency.

Editorial Office, Journal of Integrative Plant Biology, Institute of Botany, CAS
No. 20 Nanxincun, Xiangshan, Beijing 100093, China
Tel: +86 10 6283 6133 Fax: +86 10 8259 2636 E-mail: jipb@ibcas.ac.cn
Copyright © 2021 by the Institute of Botany, the Chinese Academy of Sciences
Online ISSN: 1744-7909 Print ISSN: 1672-9072 CN: 11-5067/Q
备案号:京ICP备16067583号-22