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Accueil du site → Master → Etats Unis → 1973 → Physiological and morphological characteristics related to yield and water use in alfalfa (Medicago sativa L. cult ’Mesa-Sirsa’)

University of Arizona (1973)

Physiological and morphological characteristics related to yield and water use in alfalfa (Medicago sativa L. cult ’Mesa-Sirsa’)

Wilhelm, Wallace Wayne

Titre : Physiological and morphological characteristics related to yield and water use in alfalfa (Medicago sativa L. cult ’Mesa-Sirsa’)

Auteur : Wilhelm, Wallace Wayne

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1973

Résumé
Plants of 11 clones of ’Mesa-Sirsa" alfalfa (Medicago sativa L.) were evaluated for rates of COg exchange » CO^ compensation points8 morphological characteristics, forage yield, and functions of 00^ exchange rates when grown under field conditions = The purpose of this study was to determine if differences in several characteristics existed among the genotypes$ if. interrelationships were present among the characteristics, and if these characteristics were significantly related to yield. The clones were also evaluated for water- use efficiency in a growth chamber experiment, The rates of GO^ exchange per unit leaflet area were not significantly different among clones ? however, clones were significantly different when COg exchange was expressed on a whole plant basis. Total dry forage production was significantly related to total apparent photosynthesis, total dark respiration, and total post-illumination COg burst, Total leaflet weight and total leaflet area were also significantly correlated with dry matter production, Regression analysis of all variables on yield showed that characteristics, total leaflet weight, leaflet to stem- petiole ratio, and leaflet percentage, accounted for more than 98% of the variability in yield, Significant differences were found among the 11 clones with respect to water-use efficiency and total water use6 The clones with the greatest dry matter production were also the clones that used water most efficiently« 

Mots clés : Alfalfa — Water requirements. ; Alfalfa — Morphology. ; Alfalfa — Physiology

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