Cytological Studies in <i>Cucumis</i> and <i>Citrullus</i>

Cytogenetics of semi-arid plants. III. A natural interspecific hybrid of Cucurbitaceae (Citrullus colocynthis Schrad*C. vulgaris Schrad).

“…Number of seeds produced per fruit were less than 50% as compared to the two parents. Cytology: Meiosis in C. vulgaris and C. colocynthis was normal showing regular eleven bivalents at diakinesis and metaphase I in confirmity to earlier reports of Whitaker (1933), Khoshoo (1955), Trivedi and Roy (1970) and Singh (1972). Both ring and rod bivalents were observed and later stages of meiosis were found normal culminating in as high as 93-95% pollen fertility.…”

Somatic chromosome differentiation in Cucumis melo L. and C. metuliferus E.Mey. ex Naudin

“…The chromosome measurement data such as chromosome sizes and total chromosome lengths were mainly seen in the earlier studies (Trivedi and Roy 1970;Singh and Roy 1974;Ramachandran and Seshadri 1986), although many intensive works with same chromosome ethanol-acetic acid.…”

“…Trivedi and Roy (1970) presented the somatic chromosome characters with chromosome lengths in the range of 1.2-2.5 µm, and total chromosome lengths of 39.3 µm in cultivar 'Phut'. Singh and Roy (1974) figured out the karyotypes of six melon's cultivars, and showed the chromosome lengths in the range of 1.2-2.6 µm, and the total chromosome lengths in the range of 40-42 µm.…”

Physical mapping of 45S rRN A gene loci in the cucumber (Cucumis sativusL.) using fluorescencein situhybridization

“…Not only small size and poor stainabil-ity with usual staining procedures (TRIVEDI and ROY 1970) but also difficulty with chromosome identification, since the haploid complements show seven submedian chromosomes (TRIVEDI and ROY 1970) or six median-to submedian chromosomes and one subterminal chromo some (RAMACHANDRAN and SESHADRI 1986), make cucumber a very difficult subject for cyto-logical study. There are only a few reports of chromosome identification of cucumber using Cbanding method (RAMACHANDRAN and SESHADRI 1986;HOSHI et al 1998).…”

“…The phenomena suggested that these sites might include nucleolar organizer regions (NORs). Previous papers on cucumber chromosome studies described that ten chromo somes (AYYANGAR 1967) or six chromosomes (TRIVEDI and ROY 1970;RAMACHANDRAN and SESHADRI 1986) had secondary constrictions in diploid plants, suggesting all or some of them were NORs.…”