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BIOSYSTEMATIC STUDIES IN THE BOUTELOUA CURTIPENDULA COMPLEX. V. MEGASPOROGENESIS AND EMBRYO SAC DEVELOPMENT
Author(s) -
Mohamed Aly H.,
Gould Frank W.
Publication year - 1966
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1966.tb07316.x
Subject(s) - megaspore , biology , embryo , botany , ovule , microspore , microbiology and biotechnology , pollen , stamen
Megasporogenesis and embryo sac development in the sexually reproducing taxa Bouteloua warnockii (2 n = 22), B. media (2 n = 20), B. uniflora Vasey var. uniflora (2 n = 20), B. uniflora var. coahuilensis Gould and Kapadia (2 n = 20), and B. curtipendula var. curlipendula (2 n = 40) all were found to be of the Adoxa type, in which all 4 megaspores persist and divide once to form an 8‐nucleate embryo sac. On the other hand, evidence indicated that plants of B. curtipendula var. caespitosa with high ancuploid chromosome numbers reproduce by pseudogamous fertilization of an aposporous embryo sac. In this taxon the megaspore mother cell did not go beyond the first anaphase of meiosis and the functional embryo sac developed from a nucellar cell. Although the 8‐nucleate embryo sac was typical, a 3‐nucleate embryo sac was observed to develop in some cases.