HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Figures Only Full Text Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Google Scholar Articles by Xu, Z. Z. Articles by Shimizu, H. PubMed Articles by Xu, Z. Z. Articles by Shimizu, H. Agricola Articles by Xu, Z. Z. Articles by Shimizu, H. Related Collections Crop Physiology & Metabolism Other Forage Crops Crop Ecology

CROP PHYSIOLOGY & METABOLISM

Effects of Soil Drought with Nocturnal Warming on Leaf Stomatal Traits and Mesophyll Cell Ultrastructure of a Perennial Grass

^a State Key Lab. of Vegetation and Environmental Change, Institute of Botany, Chinese Academy of Sciences, 20 Nanxincun, Xiangshan, Beijing 100093, China, and Institute of Atmospheric Environment, China Meteorological Administration, Shenyang 110016, China
^b Asian Environment Research Group, National Institute for Environmental Studies (NIES), 16-2 Onogawa, Tsukuba, Ibaraki, 305-8506, Japan

^* Corresponding authors (xuzz{at}ibcas.ac.cn; gszhou{at}ibcas.ac.cn).

While water deficit and rising temperatures are progressive global problems, their combined effect on plants has received less attention. Stomatal traits, mesophyll cell ultrastructure, net photosynthetic rate, lipid peroxidation, and ion leakage were examined in leaves of Leymus chinensis (Trin.) Tzvel. plants using native Castanozem soil. Stomatal traits and mesophyll cell ultrastructure were studied using light microscopy and transmission electron microscope. Under severe water stress, malondialdehyde and ion leakage increased, especially at high night temperatures of 30/25°C (day/night). Mild water stress increased stomatal density, especially with normal night temperatures of 30/20°C (day/night). Moderate and severe water stress did not affect stomatal density. Under water stress, mesophyll cell ultrastructures were disturbed, and the membrane systems of chloroplasts and mitochondria were broken, particularly at high night temperatures. Leaf net photosynthetic rate and stomatal conductance were negatively correlated with ion leakage and malondialdehyde. The results suggested that high night temperature may aggravate the adverse effects of soil water deficit on leaf stomatal traits and mesophyll cell ultrastructure and also enhance lipid peroxidation.

Abbreviations: DW, dry weight • FW, fresh weight • MDA, malondialdehyde • ROS, reactive oxygen species • RT, relative turgidity • TCA, trichloroacetic acid • TW, turgid fresh weight