Effects of buffer capacity on growth, photosynthesis, and solute accumulation of a glycophyte (wheat) and a halophyte (Chloris virgata)

被引：49

作者：

Yang, C. -W. ^{[1
]}

Zhang, M. -L. ^{[1
]}

Liu, J. ^{[1
]}

Shi, D. -C. ^{[1
]}

Wang, D. -L. ^{[1
]}

机构：

[1] NE Normal Univ, Key Lab Vegetat Ecol, Minist Educ, Changchun 130024, Jilin Province, Peoples R China

来源：

PHOTOSYNTHETICA | 2009年 / 47卷 / 01期

基金：

中国国家自然科学基金;

关键词：

alkali-stress; carotenoids; Chloris virgata; chlorophyll; K+; Na+; organic acids; proline; salt stress; stomatal conductance; transpiration rate; wheat; SALT TOLERANCE; STRESS; SALINITY; PLANTS;

D O I：

10.1007/s11099-009-0010-y

中图分类号：

Q94 [植物学];

学科分类号：

071001 ;

摘要：

Two species with different resistances to alkaline pH, the glycophylic Triticum aestivum (wheat) and the halophilic Chloris virgata, were chosen as test organisms. The salt-alkaline (SA) mixed stress conditions with different buffer capacities (BC) but with the same salt molarities and pH were established by mixing neutral (NaCl, Na2SO4), and alkaline salts (NaHCO3 and Na2CO3) in various proportions. Growth, photosynthetic characteristics, and solute accumulation of the seedlings were monitored to test the validity of BC as a decisive index of alkali-stress (AS) intensity in SA mixed stress. At the same salinities and pHs, the relative growth rate, the content of photosynthetic pigments, and net photosynthetic rates of wheat and C. virgata decreased, while Na+ content and Na+/K+ ratios in shoots increased with increasing BC. Hence BC was a true measure of AS intensity at mixed SA stress and the alkali-resistance mechanism of plants was easy to interpret. BC of soil solution is an important parameter for estimating the alkalization degree of salt-alkalized soil.

引用

页码：55 / 60

页数：6

共 19 条

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