Thumbnail Image

Theses

Browse

1962 - 19643
Reset filters
Subject: Plant Breeding × Author: KAU × End date: 1970 × Start date: 1962 × Type: Thesis × Thesis Type: M.Sc ×
Reset filters

Search Results

Now showing 1 - 3 of 3
  • Thumbnail Image
    ThesisItemOpen Access
    Breeding behaviour of interspecific hybrids in the genus Arachis L.
    (Regional Post Graduate Training Centre, Agricultural College and Research Institute, Coimbatore, 1962) Gopinathan Nair, P; KAU; Ponnaiya, B W X
    The investigation aims at a comparative study of two kinds of F2 populations. The first one was derived from hybrids between two tetraploid parents, namely A-hypognea and A.sp (A.354) whose genomes are homologous. The second typeof tetraploids were derived from back cross hybrids between A-hypognea and allotriploid (resulting from the cross A-hypognea X A.sp. (A.329)). A comparative morphological and cytological analysis of these F2 populations have been made. Special techniques such as Hybrid index method and Polygraphic analysis were adopted and the variability expressed in the two F2populations have been eveluated. The possible causes for the occurrence of a skewed recombination in the straight F2 population have been suggested.
  • Thumbnail Image
    ThesisItemOpen Access
    Investigations on the effects of X-rays on Cowpea (Vigna sinensis L. SAVI.)
    (Division of Agricultural Botany, Agricultural Botany, Agricultural College & Research Institute, Vellayani, 1964) Ravindran Nayar, P N; KAU; Kumara Pillai, P
    This thesis embodies the results of an investigation carried out to study the effect of X-rays on the common cowpea (vigna senensis). A pure variety of cowpea (African) was selected , dry and pre soaked seeds of which were treated with X-raysat the following doses: 1000, 3000, 5000, 7000, 9000, 11,000, 13,000 and 15,000 r. units. Germination, survival of plants, chlorophyll and other morphological abnormalities, growth of plants, pollen sterility, flower production, fruit set, average seeds per pod and 1000 seed weight were studied. The frequency of abnormal anaphases were studied from root tip squashes. Regression analysis was carried out for almost all obsevations to establish the relationship between doses and the different characters observed.
  • Thumbnail Image
    ThesisItemOpen Access
    Studies in some varieties and inter-racial hybrids of Oryza sativa Linn.
    (Faculty of Cytogenetics and Plant Breeding, Agricultural College and Research Institute, Coimbatore, 1964) Karunakaran, K; KAU; Ponnaiya, B W X
    The evolution in the concept of geographical rices in Oryza sativa L. The nature and extent of sterility in inter-varietal hybrids and the different explanations for the same, heterosis and its utilization of rice breeding, and pachytene analysis as amethod of karyotypic studies in the genus Oryza with special reference to the intervarietal karyotypic diversity in O.sativa have been briefly reviewed.