TY - JOUR
T1 - Physiological studies on salinity and nitrogen interaction in alfalfa. ii. photosynthesis and transpiration
AU - Khan, M. G.
AU - Silberbush, M.
AU - Lips, S. H.
N1 - Funding Information:
ACKNOWLEDGMENTS MGK is grateful to MASHAV (Division of International Cooperation),The Ministry of Foreign Afairs of Israel, for providing financial assistance in form of post doctoral fellowship during the present investigation. The assistance rendered by Mr. Xong for the measurements by IRGA is also thankfully acknowledged.
PY - 1994/3/1
Y1 - 1994/3/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=0028011583&partnerID=8YFLogxK
U2 - 10.1080/01904169409364757
DO - 10.1080/01904169409364757
M3 - Article
AN - SCOPUS:0028011583
SN - 0190-4167
VL - 17
SP - 669
EP - 682
JO - Journal of Plant Nutrition
JF - Journal of Plant Nutrition
IS - 4
ER -