Intergeneric hybrids of Saccharum

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Intergeneric hybrids of Saccharum: IV. Saccharum-Narenga

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Triplo-polyploidy in Saccharum spontaneum L

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Adaptive isochromosomes in Nicandra

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Polyploidy and vitamin C in Emblica officinalis gaertn

Emblica officinalis collected from various parts of India was found to have chromosome number 2n=98=14x and is therefore a much higher polyploid than the one reported on by Perry which is a tetraploid 2n=28. Cultivated forms of Emblica officinalis have variable numbers ranging from 2n=98 to 2n=104 and these have larger fruits. A comparative analysis of Vitamin C content of wild and cultivated varieties is given. Ascorbic acid content is found to be directly proportional to the size of the fruit and fruit size is correlated with the presence of a few extra chromosomes in the already high polyploid

Cytomorphological studies in autotetraploid Asparagus officinalis L

A comparative study of morphological and cytological characters of a diploid and artificially induced tetraploids Asparagus officinalis has been made. Vegetatively tetraploids are more vigorous than the diploids but cytologically they exhibit an unstable nature. A breakdown of tetraploidy has been noticed which was due to large number of irregularities in meiosis like quadrivalents, trivalents and univalents at metaphase and laggards and bridges at anaphase. In few cases multipolar spindle and nuclear breakdown was seen. Several PMC's showed reduced chromosome numbers probably due to chromosome elimination during the premeiotic division

Polyploidy in Solanum Melongena Linn

1. The ehromosomes of diploid (2x=24) and triploid (3x=36) Solanum Melongena were studied in somatic and meiotic divisions. The triploid arose from the funetioning of a diploid pollen grain. 2. Long median and short chromosomes are distinguished at meiotic metaphase and differ at meiosis in two ways:- (a) The shorter ehromosomes have fewer chiasmata and consequently univalents of this type are commoner in the triploid (as in Hyacinthus). (b) The shorter chromosomes have earlier and more complete terminalisation than the Tonger ones (as in Fritillaria). 3. The triploid when selfed gave two tetraploid and 11 tetraploid or nearly tetraploid seedlings. These evidently resulted from gametes to which all the extra set of chromosomes had passed at meiosis. This is compatible when the random segregation observed at meiosis for the triploid is less than 1% fertile