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Chromosome Numbers, Microsporogenesis, and Mode of Reproduction of Seven Paspalum Species 1
Author(s) -
Burson Byron L.,
Bennett Hugh W.
Publication year - 1971
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1971.0011183x001100020038x
Subject(s) - apomixis , biology , paspalum , meiosis , botany , chromosome , ploidy , sexual reproduction , megaspore , genetics , ovule , pollen , gene
Summary Paspalum pumilum Nees had a chromosome number of 2n = 20. The chromosome number in P. arechavaletae Hack., P. cromyorhizon Trin. ex Doell., P. exaltatum F. & C. Presl, P. guenoarum Arech., and P. lividum Trin. ex Schlecht. was 2n = 40; and in P. mandiocanum Trin. it was 2n = 60. Meiosis was regular in P. pumilum, P. arechavaletae, P. exaltatum , and P. mandiocanum with primarily bivalent pairing. P. cromyorhizon and P. guenoarum had frequent quadrivalents, and meiosis in P. lividum was the most irregular with lagging chromosomes and micronuclei. A study of megasporogenesis and embryo sac development in each species showed that P. pumilum and P. arechavaletae were sexual and the other five species reproduced by apomixis. The type of apomixis was apospory and, with the exception of P. mandiocanum , species were pseudogamous.