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Accueil du site → Master → Etats Unis → 1985 → PHYSIOLOGY OF SALT TOLERANCE IN GUAR, CYAMOPSIS TETRAGONOLOBA (L.) TAUB.

University of Arizona (1985)

PHYSIOLOGY OF SALT TOLERANCE IN GUAR, CYAMOPSIS TETRAGONOLOBA (L.) TAUB.

Andrade, Maria Isabel.

Titre : PHYSIOLOGY OF SALT TOLERANCE IN GUAR, CYAMOPSIS TETRAGONOLOBA (L.) TAUB.

Auteur : Andrade, Maria Isabel

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1985

Résumé
Guar (Cyamopsis tetragonoloba (L.) Taub seeds, seedlings and plants were subjected to a series of treatments in an attempt to charac terize salt tolerance. A range of solutions (NaCl, KC1, NaCl + KC1 and PEG 6,000) of concentrations 0-1.5 mPa were used. Seed of three cul tivars were tested for germination, salt uptake, respiration and selec ted for germination-salt tolerance under various salt and PEG regimes. Two varieties of seedlings were subjected to a range of solutions and analyzed for water potential, photosynthesis, respiration, salt uptake, and selected for seedling salt tolerance. A comparison was made between seedling and germination-salt tolerance. Older plants were tested for photosynthesis, respiration, transpiration, water potential, leaf tem perature and stomatal density. Results showed that PEG hindered germination more than salt. Chloride and K+ inhibit germination more than Na+. The cultivar which accumulated the most ions showed the highest respiration and also the highest stomatal density. These factors may thus be related to salt tolerance. Mixing of Na and K salts resulted in increased uptake of both. Salt tolerance in the seed germination stage is not related to salt tolerance in the seedling stage. Salt also increased transpira tion photosynthesis and respiration. With the exception of one cultivar the selected seed showed a significant increase in germination under treated and control solutions.

Mots clés : Plants — Effect of salts on. ; Guar. ; Salt-tolerant crops.

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