Showing papers by "Central Tuber Crops Research Institute published in 1967"
TL;DR: It is proposed that the present day cultivated forms of Eu-Sorghums are allopolyploids of crosses between two such forms and two basic archetypes in the 20-chromosomed taxa have been suggested.
Abstract: The detailed morphology of the pachytene chromosomes and microsporogenesis have been studied in the six Eu-Sorghums. The pachytene chromosomes are depicted on the basis of total length, relative length, arm ratio, amount and distribution of heterochromatin and number and position of chromomeres. The characteristics of each of the ten pachytene bivalents in the haploid complement are described in detail bringing out similarities and differences amongst them. Based on the idiograms of the pachytene chromosomes, the possible role of chromosomes in speciation and the relationship amongst these Eu-Sorghums are discussed. Two basic archetypes in the 20-chromosomed taxa have been suggested-one with five long chromosomes and the other with five short chromosomes. It is proposed that the present day cultivated forms of Eu-Sorghums are allopolyploids of crosses between two such forms.
7 citations
01 Jan 1967
TL;DR: The mode of inheritance of one seedling character and nine mature plant characters has been worked out in detail in the different interspecific crosses in the genus Sorghum, with clear evidence for breakdown of dominance in different genetic backgrounds and data for the presence of ‘modifier gene complexes’.
Abstract: The mode of inheritance of one seedling character and nine mature plant characters has been worked out in detail in the different interspecific crosses in the genusSorghum. The majority of the factor pairs exhibited simple inheritance. However, clear evidence for breakdown of dominance in different genetic backgrounds and data for the presence of ‘modifier gene complexes’ has also been obtained. The implication of these results to the genetic evolution of the variousSorghums species, is critically discussed. Further, the bearing of loci found duplicate with respect to various qualitative characters, has also been considered in relation to the polyploid origin ofArundinacea Sorghums. The genetics of the two new variants have been studied and the taxonomic importance of such anomalies is brought out.
1 citations
01 Jan 1967
TL;DR: It is suggested that these Halepensia Sorghum varieties are more or less closely related and they may be geographical races of one and the same species.
Abstract: Salient morphological characters of seven interspecific hybrids were studied and compared with their respective parental species. The dominance relationship of several qualitative characters were also determined.