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Cytology and Breeding Behavior of Brachiaria Ruziziensis Germain Et Evrard 1
Author(s) -
Ferguson J. E.,
Crowder L. V.
Publication year - 1974
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/cropsci1974.0011183x001400060036x
Subject(s) - biology , inbreeding depression , seedling , brachiaria , meiosis , pollen , human fertilization , pollination , ploidy , open pollination , inbreeding , germination , gametophyte , botany , agronomy , forage , genetics , population , demography , sociology , gene
The diploid chromosome number of 2n=l8 was recorded in plants from 16 accessions of Brachiaria ruziziensis Germain et Evrard. Meiosis appeared regular and pollen stainability averaged 87%. The female gametophyte was derived from a megaspore and when mature had eight nuclei. Cross‐fertilization occurred at a very high frequency under conditions of natural open‐pollination. Seed set averaged 21 and 0.4% for open‐ and self‐pollination, respectively, suggesting the operation of a self‐incompatibility mechanism. One generation of self‐fertilization reduced seedling germination and survival. Significant inbreeding depression for total dry matter production was found in 4 of 6 S, families.