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sur le développement des zones arides et semi-arides

Titre : Cytology and cytogenetics of Eragrostis curvula (Schrad.) Nees.

Auteur : Stalker, H. T. (Harold Thomas)

Université de soutenance : University of Arizona

Grade : Master of Science (MS) 1973

Résumé
This study was conducted at the research laboratory of the Agricultural Research Service located at the Tucson Plant Materials Center and at the Department of Agronomy and Plant Gen©tics9 The University of Arizona9 Tucson0 The objectives were to determine the mode of reproductiong chromosome numbers chromosome behavior8 and to evaluate plant characteristics of diploidg autotetraploid§ eultivar 8 Catalina8 j, and first "generation plants of weeping lovegrass9 reproduced by sexual mode of reproduction with a monosporic Polygonum^type mature embryo sac » Catalina plants repro« ” duced by diplospory® A tetrad of megaspores was the basis used for distinguishing sexual from apomictic types0 quadrivalents in diakinesis8 while autotetraploid plants had univalents8 bivalents$ and quadrivalents6 Both plants had laggards at anaphase I„ Most diploid microspores had bivalents, but univalents were also observed during diakinesiso Pollen size was not a distinguishing characteristic of apomixis or ploidy levels• Most first-generation plants had an expected chromo some number of 40$ but aneuploidy was also observede The plants had, variable plant characteristics of height§ seed weight8 number of seed produceds vigor9 frost tolerances and sterility.

Mots clés : Weeping lovegrass — Cytogenetics. ; Plant cytogenetics.

Présentation

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