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Accueil du site → Doctorat → États-Unis → 1974 → DIALLEL ANALYSIS OF WATER-USE EFFICIENCY IN GIANT BERMUDAGRASS CYNODON DACTYLON (L.) (PERS.) VAR. ARIDUS (HARLAN ET DE WET)

University of Arizona (1974)

DIALLEL ANALYSIS OF WATER-USE EFFICIENCY IN GIANT BERMUDAGRASS CYNODON DACTYLON (L.) (PERS.) VAR. ARIDUS (HARLAN ET DE WET)

Lira, Mario de Andrade

Titre : DIALLEL ANALYSIS OF WATER-USE EFFICIENCY IN GIANT BERMUDAGRASS CYNODON DACTYLON (L.) (PERS.) VAR. ARIDUS (HARLAN ET DE WET)

Auteur : Lira, Mario de Andrade

Université de soutenance : University of Arizona

Grade : Doctor of Philosophy (PhD) 1974

Résumé
All possible reciprocal crosses were made among six selected giant bermudagrass, Cynodon dactylon (L.) Pers. var. aridus Harlan et de Wet, clones. Progenies and parents were evaluated for forage yield, transpiration, and wateruse efficiency under two moisture regimes and two fertility levels in growth-chamber studies. Nitrogen promoted a large increase in yield. This increase in yield was accompanied by an increase in transpiration and an improved water-use efficiency (w.u.e.). Yield and transpiration were larger under excessive soil moisture supply than under normal soil moisture supply but w.u.e. was approximately the same under the two moisture levels. Differences among yield means were not significant but transpiration and w.u.e. showed significant differences among crosses. These characters were significantly correlated. Heritabilities determined by regression of midparent and offspring and by regression of female parent and offspring showed fair agreement. Heritability for w.u.e. was much higher than that for yield and transpiration. Reciprocal effects were significant for yield and transpiration with no other parameters significant for these two characteristics. Water-use efficiency, on the other hand, showed significant specific combining ability with no other parameters significant for this character.

Mots clés : Bermuda grass — Water requirements.

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