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University of Arizona (1984)

AGRONOMIC AND PHYSIOLOGICAL RESPONSES OF COWPEAS (VIGNA UNGUICULATA L. WALP) EXPOSED TO WATER STRESS.

Tewolde, Haile

Titre : AGRONOMIC AND PHYSIOLOGICAL RESPONSES OF COWPEAS (VIGNA UNGUICULATA L. WALP) EXPOSED TO WATER STRESS.

Auteur : Tewolde, Haile

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1984

Résumé
Field evaluations of cowpeas were made in order to investigate the effects of water stress on growth, reproductive organs, and certain physiological characters. In 1982, ’California Blackeye #5’ (CBE 5), ’Speckle Purple Hull’ (SPH), and AZ-54 cowpeas and in 1983 CBE 5 were evaluated under different stress treatments. Cultivars in 1982 did not show significant differences in veg etative growth and abscission of reproductive organs under all stress treatments. Prolonged stress in 1983 significantly reduced growth, num ber of pods, and seed yield of CBE 5. In 1982, cultivars exhibited some significant differences in stomatal resistance, transpiration, and leaf temperatures. Diffusive resistance and leaf temperatures decreased and transpiration tended to increase under all treatments over the growing season. In 1983, pro longed stress significantly affected these physiological parameters as well as leaf water potential.

Mots clés : Cowpea — Drought tolerance. ; Cowpea — Water requirements.

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Page publiée le 26 avril 2016, mise à jour le 17 février 2018