CYTOLOGICAL AND MORPHOLOGICAL STUDIES OF SOME SPECIES AND SPECIES HYBRIDS IN THE GENUS SORGHUM

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Abstract
The dominant-recessive relationships of various qualitative characters have been studied in 11 interspecific hybrids in the genus Sorghum. Pachytene chromosome pairing was normal and high pollen fertility and good seed setting was observed in all the parental species except the male sterile "Kafir". Studies on the pairing properties of the differentially stained regions showed that synapsis starts from the proximal to the distal end and separation of the split chromosomes was found to be of reverse order. The interspecific hybrids were classified into 4 categories based on pachytene pairing and pollen sterility. 1Normal pairing accompanied by high pollen fertility. 2. Normal pairing accompanied by partial pollen sterility. [image]3. Irregularities in pachytene pairing followed by partial pollen sterility and 4. Irregularities in pachytene pairing accompanied by normal pollen fertility. Explanations are advanced to explain meiotic irregularities observed in certain hybrids. Based on cytomorphological data, the interrelationships among the species are discussed.