Cytological investigation of 10-chromosome species ofBrassica and theirF 1 hybrids

Crosses Within the Campestris Group of the Genus Brassica

“…In regard to the cytology of the hybrids PEARSON (1928) states, »although no detailed cytological investigation has been made of these crosses, the preliminary study indicates that pairing is normal and that no irregularities occur at the reduction division», MORINAGA (1928) states that the reduction division is normal in the hybrids studied by him and the same holds true of the hybrid between pekinensis and» [aponica» RICHHARIA (1937) found regular meiosis, while in the combination pekinensis Xmpa »occasionally two free univalents were observed and occasionally separation was into 9 and 11 instead of 10 and 10». In the hybrid between trilocularis (=sarson) and rapa SIKKA (1940) observed complete pairing in diakinesis and first metaphase while non-disjunction occurred in some instances at first anaphase.…”

UG1 Turnip Germplasm Possessing Resistance to Turnip Mosaic Virus

“…Although turnip and Chinese cabbage (2n = 20) both possess the A crucifer genome (U, 1935), differences in chromosome morphology between these two subspecies have been noted. Richharia (1937) explored the morphological differences among the 20 chromosome species of Brassica and reported that turnip had 3E and 2F chromosomes, whereas Chinese cabbage had 2E and 3F chromosomes; the other chromosomes were similar. When these subspecies were hybridized, nonrandom pairing of chromosomes occasionally occurred.…”

Secondary Association in <i>Eleusine coracana</i> (Finger Millet)

“…But the latter's wider application in varieties of plants (Darlington 1928, Lawrence 1931, Gustafsson 1934, Nandi 1936, Richaria 1937, and the relatively reliable conclusions that can be drawn therefrom should suggest it to be a better alternative if not equal. …”