PHYSIOLOGICAL-STUDIES ON SALINITY AND NITROGEN INTERACTION IN ALFALFA .2. PHOTOSYNTHESIS AND TRANSPIRATION

被引:23
作者
KHAN, MG [1 ]
SILBERBUSH, M [1 ]
LIPS, SH [1 ]
机构
[1] BEN GURION UNIV NEGEV,JACOB BLAUSTEIN INST DESERT RES,DESERT AGROBIOL RES CTR,IL-84993 SEDE BOQER,ISRAEL
关键词
D O I
10.1080/01904169409364757
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
The interaction between salinity and nitrogen (N) forms and concentration was studied with alfalfa (Medicago sativa L.) grown in pots with fine sand under greenhouse conditions. Salinity (0-100 mM NaCl) caused a substantial reduction in carbon assimilation rate, stomatal conductance, water use efficiency, and leaf area, while transpiration rate was least affected. Salinity effects were considerably moderated by additional N supply, varied with form, concentration, and stage of plant growth. The photosynthesis was reduced more in ammonium- than in nitrate-fed plants, while the transpiration rate was relatively lower in nitrate-fed plants grown either with or without NaCl. The plants also responded differently to salinity and N levels at two harvests. This indicated a change in plant behaviour with age. The promotive effect of N on photosynthesis and other parameters in saline as well as in non-saline conditions may be attributed to the enhanced synthesis and availability of carbon assimilatory enzymes and cofactors required for optimal photosynthesis.
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页码:669 / 682
页数:14
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