Journal ArticleDOI
Cyto-genetical investigations in some common cucurbits, with special reference to fragmentation of chromosomes as a physical basis of speciation.
P N Bhaduri,P C Bose +1 more
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TLDR
Are sex chromosomes in higher pl,~nt~ nucleologenic?Abstract:
Introduction . M~t~rial and methods 0 bservations: Cucumis a~giz,u~ . Cucumis Memo Trichoaanth~ diolca Luffa aegyp~i~c,a . Luffa a~u~an~u~a . 6'o~iuia indica Beuincasa cerifera M~,mrdica cllarantia Cucurbita ~r~aarima Polysomaty Discussion (i) Numerica! correlation between m a~m um number ofnucleoli, sat~llltes and secondary constrictions (ii) Maximum number of nucleo]i ,lnd nucleolar constrictions of chromosomes witah reference to polyplcidy and aneuploidy . . . {iii) Variation of chromosome number in Cucm.bitaceac and R~. cytogsnetic interpretation (iv} Are sex chromosomes in higher pl,~nt~ nucleologenic? . Summary P, efsrsnces P A G ~read more
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A reevaluation of karyotype in cucumber (Cucumis sativus L.)
TL;DR: A karyotype analysis was conducted on the mitotic chromosomes of cucumber using improved chromosome preparation and C-banding techniques, leading to a precise identification of each pair of chromosomes.
Journal ArticleDOI
Physical mapping of 45S rRNA genes in Cucumis species by fluorescence in situ hybridization
TL;DR: The chromosomal locations of the genes coding for the 18S-5.8S-26S rRNA was investigated in Cucumis species using fluorescence in situ hybridization and the different number and pattern of rDNA sites is consistent with the hypothesis that considerable phylogenetic distance exists among these species.
Journal ArticleDOI
Sex determination in dioecious species of plants
A. A. Sharma,D. Chattopadhyay +1 more
TL;DR: Evidences suggest that the change from bisexuality to unisexuality and homomorphicity to heteromorphicity in chromosomes had been a short step in evolution possibly occurring in the recent past.
Journal ArticleDOI
Karyotyping in Melon (Cucumis melo L.) by Cross-Species Fosmid Fluorescence in situ Hybridization
TL;DR: This study provides a basis for cytological characterization of the melon genome and comparative genomics of Cucurbitaceae and compared the distribution of 21 FISH-mapped fosmids between melon and cucumber chromosomes, which allows a better understanding of the evolutionary process shaping these 2 species.
References
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Journal ArticleDOI
The relation of a particular chromosomal element to the development of the nucleoli in Zea mays
TL;DR: The nucleolus is organized in the telophase through the activity of a distinct deep-staining body having a definite position in one chromosome (the satellited chromosome) of the monoploid complement through a reciprocal translocation which broke this body into two parts.
Journal ArticleDOI
Die Ursache der gesetzmässigen Zahl, Lage, Form und Grösse pflanzlicher Nukleolen
TL;DR: The physiological meaning of the nucleoli still remains one of the most obscure questions of the cytology as discussed by the authors, even after more than 100 years of the discovery of the Nukleolus.
Journal ArticleDOI
Chromosome Studies in Some Dioecious Plants, with Special Reference to the Allosomes
TL;DR: The chromosomes of the male plants of 17 genera, 22 species and 2 varieties of dioecious phanerogams have been investigated and the following 13 forms show each an unequal pair of chromosomes in addition to autosome pairs at the meiotic division in microsporocytes.
Journal ArticleDOI
The origin of iso-chromosomes
TL;DR: The misdivision and the origin of the iso-chromosome are each likely to be important as affecting the genetic structure of the chromosome and the mechanical properties of the centromere.
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