Solute accumulation and distribution during shoot and leaf development in two sorghum genotypes under salt stress

被引:265
作者
de Lacerda, CF [1 ]
Cambraia, J
Oliva, MA
Ruiz, HA
Prisco, JT
机构
[1] Univ Fed Ceara, Dept Bioquim & Biol Mol, BR-60451970 Fortaleza, Ceara, Brazil
[2] Univ Fed Vicosa, Dept Biol Geral Biol Vegetal & Solos, BR-3657100 Vicosa, MG, Brazil
关键词
genotypes; Cl-; Na+; non-structural carbohydrates; proline; salinity; Sorghum bicolor;
D O I
10.1016/S0098-8472(02)00064-3
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Seedlings of two forage sorghum genotypes (Sorghum bicolor (L.) Moench) differing in salt tolerance were subjected to 0 and 100 mM NaCl and shoot development, leaf elongation, and organic and inorganic solutes contents in leaves were measured. Salt stress reduced both shoot development and leaf elongation and enhanced leaf senescence and injury. It also led to accumulation of toxic ions (Na+ and Cl-), organic solutes (carbohydrates, amino acids and proline), and reduction of K+ content in leaf blades. Toxic ion accumulation was higher in the basal zone of the leaf blade and occurred during the period of intense leaf growth while organic solutes accumulation, mainly proline, was higher in the apical zone and occurred when the leaves practically had reached their final size. All these changes were more conspicuous in the sensitive than in the tolerant genotype. The latter also retained more toxic ions in leaf sheath tissue than the former. It is suggested that the reduction in shoot development and leaf elongation were related to toxic ion accumulation and depletion of K+ ions in the leaf blades. The accumulation of organic solutes in leaves did not appear to be related to salt tolerance. Proline accumulation appears to be a reaction to salt stress damage and not a plant response associated with salt tolerance. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:107 / 120
页数:14
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