• G R Rao

      Articles written in Proceedings – Plant Sciences

    • Some observations on interspecific hybrids ofSolanum melongena L.

      G R Rao Anil Kumar

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      Cytomorphological characters ofSolanum indicum L. andS. melongena L., and of their hybrids (F1) were studied. The hybrids were fertile with mostly normal meiosis. It is concluded from cytology of the hybrids that small structural differences exist between the chromosomes of the parents. The potential ability of the parents to produce new recombinations inF2 is discussed. The conflicting observations of different workers on these species crosses are likely due to occurrence of variability in genetic architecture ofS. indicum andS. melongena. The plants ofF2 progeny were tested againstFusarium oxysporum,Phomopsis vexans andLeucinodes orbonalis. The plants found to be resistant were used in the study and from the subsequent studies a large population ofF4 generation was raised with desirable agricultural features.

    • Investigations on cytogenetics and development of improved pest-resistant egg-plant germplasm

      G R Rao

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      Cytomorphology ofSolanum melongena L. var. Nurki Baigan,S. incanum L. and theirF1 hybrids was studied. The fertility of the hybrids was as high as 48·60. A study of meiosis of the hybrids revealed a close genetic relationship between the two species. The plants ofF3 progeny were tested againstPhomopsis vexans andLeucinodes orbonalis. Two plants of high yield with resistance to both the organisms were selected. TheF4 progeny of each selection was morphologically homogeneous and resistant, under field conditions, toP. vexans andL. orbonalis. The fruits matured to edible stage about 16 days earlier than the fruits of ‘Nurki Baigan’.

    • Cytology ofSolanum nigrum L.,S. retroflexum Dunn. and their hybrids

      G R Rao Anil Kumar

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      Cytomorphological characters ofSolanum retroflexum and tetraploidS. nigrum, and theirF1 hybrids were studied. The hybrids were fertile with highly regular meiosis. It is concluded that the species are differentiated primarily by genetic factors. The origin of the two species from the same or identical ancestors is discussed.

    • Gibberellin-like substances in seed and leachates of black gram (Phaseolus mungo L.)

      A V Kumar S V Prasad K N Rao G R Rao

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      Gibberellin-like substances of black gram at different periods after soaking were extracted from seed and leachates into neutral, acidic and bound fractions. Five different factors in the acidic, four factors in the neutral and eight factors in bound fractions have been located based on their biological activity in the seed and their leachates. The effect of leaching of gibberellin-like substances at different intervals is correlated with the growth of performance of the seedlings at the end of each soaking period.

    • Taxonomic status of theSolanum nigrum complex found in India

      A Ganapathi G R Rao

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      An attempt has been made, with the help of modern taxonomic treatments, to determine the correct taxonomic status of theSolanum nigrum L. complex in India. On the basis of comparative morphological and cytological studies, it is concluded that the diploids, tetraploids and hexaploids are in fact,Solanum americanum Mill. var.patulum; Solanum villosum Mill. subsp.miniatum (Bernh. ex willd.) Edmonds, andSolanum nigrum L. subsp.nigrum, respectively.

    • Cytology of hybrids betweenSolanum nigrum L. andSolanum furcatum Dun.

      A Ganapathi G R Rao

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      Cytomorphological features of theSolanum nigrum L. andSolanum furcatum Dun., and their F1 hybrids were studied. The hybrids showed highly irregular meiosis and were sterile without fruit-set. It is concluded that the morphological diversity and intersterility of the species are due to structural differences between their chromosomes.

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