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Accueil du site → Master → Etats Unis → 1978 → Photorespiration, apparent photosynthesis, specific leaf weight, and leaf anatomy of selected alfalfa (Medicago sativa L.) clones

University of Arizona (1978)

Photorespiration, apparent photosynthesis, specific leaf weight, and leaf anatomy of selected alfalfa (Medicago sativa L.) clones

Osment, Jeannie Valene

Titre : Photorespiration, apparent photosynthesis, specific leaf weight, and leaf anatomy of selected alfalfa (Medicago sativa L.) clones

Auteur : Osment, Jeannie Valene

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1978

Résumé
One hundred and fifty alfalfa (Medicago sativa L .) clones were space-planted in the field and 20 plants were evaluated for apparent photosynthesis, post-illumination burst and dark respiration (AP, PIB, and DR) throughout the growing season. Forage yield, specific leaf weight, and leaf morphology ;were observed and their relationship to COg exchange determined. The five highest and five lowest yielding alfalfa clones were studied for relationships between yield and leaf width and palisade thickness and the data were analyzed statistically and evaluated. Apparent photosynthetic rates of the upper 30 cm of a detached-2 -1 stem ranged from 2.26 to 57.59 mg CO^ dm hr at a light intensity of 2 jOOOy Einsteins.— 9 — 1 PIB ranged from 5.45 to 34.93 mg CO2 dm hr at the same light intensity. Photorespiration rates ranged from 0 to 27.34 rng CO’^ -2 -1 dm hr . AP, PIB, and PR were not consistently associated with specific leaf weight or dry matter yield per plant. Anatomical measurements of leaf width and palisade thickness were unrelated to AP, PIB, PR, SLW and dry matter yield per plant. Clones from the 5 maternal parent plants showed great genetic variabil ity in yield, SLW, photorespiration and morphological characteristics,

Mots clés : Alfalfa — Physiology. ; Alfalfa — Anatomy.

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Page publiée le 25 janvier 2016, mise à jour le 18 décembre 2017