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Author: search.filters.author.Shajitha, P

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    HERITABILITY, CORRELATION AND PATH COEFFICIENT ANALYSIS FOR MORPHO-PHYSIOLOGICAL TRAITS IN WHEAT
    (2015-01) Shajitha, P; Gajalakshmi, Kandasamy; Sivasamy, M; Nisha, P
    Heritability, inter-relationship and path coefficient studies were performed in ten bread wheat genotypes in the background of (Lok-1, MACS2496, NI5439, NIAW 34, PBW 226, PBW 343, PBN 51, PBW 502, WH542 and WH147) carrying yield potential gene Lr19/Sr25 along with rust resistance. Very high broad sense heritability was estimated for all the morphological characters studied. Grains per spike exhibited highest heritability value of 99.4% while tillers per plant showed minimum value of 90%. Genotypically plant height, spike length, spikelets per spike, grains per spike and 1000-grain weight were positively and significantly correlated with tillers per plant while highly significantly associated phenotypically. Flag leaf area was positively but non-significantly associated with grain yield; whereas, fertile tillers per plant was negatively and nonsignificantly correlated with grain yield. Plant height, flag leaf area, spike length and grains per spike had positive direct effects on grain yield. While fertile tillers per plant, spikelets per spike and 1000-grain weight exhibited negative direct effects on grain yield. The traits having positive direct effects on grain yield are considered to be suitable selection criteria for evolving high yielding genotypes.
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    GENETIC DIVERGENCE OF BREAD WHEAT GENOTYPES BASED ON CLUSTER AND PRINCIPAL COMPONENT ANALYSIS FOR BREEDING STRATEGIES
    (Biochemical and Cellular Archives, 2015) Shajitha, P; Sivasamy, M; Gajalakshmi, K; Baghyalakshmi, K; Vikas, V K
    The genetic divergence study was conducted to estimate the nature and magnitude of diversity in Lr19+ and Lr19-lines of bread wheat. The divergence analysis including Tocher's, canonical (vector) and Principal component analysis(PCA) for yield and its nine contributing characters were studied. The twenty two wheat genotypes were grouped into four clusters by both Tocher's method of divergence study. The result of PCA revealed that all the 4 principal components (PC1, PC2, PC3 and PC 4) contributed 93.35% of the total variability. The first PC assigned 60% and the second PC assigned 16% and of total variation between traits. The first PC was more related to days to heading, plant height, tillers per lant, spikelets per spike, grain yield per spike and peduncle length. Therefore, selection based on first component is helpful for a good hybridization breeding program. The information obtained from this study can be used to plan crosses and maximized the use of genetic diversity and expression of heterosis from alien translocation.
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    CROSS-INCOMPATIBILITY : PREVENTING FERTILIZATION IN EINKORN WHEAT (TRITICUM MONOCOCCUM)
    (Connect Journals, 2015-01-11) Baghyalakshmi, K; Kumar, M; Subashini, G; Shajitha, P; Prabakaran, A J
    Genetic variation in crop species and their wild relatives holds the key for successful breeding of improved cultivars. Gene pool of wild species is usually more difficult to manipulate than the one found within the cultivated species. However, the ease of manipulation and success in using genes from wild species will vary with the crosses attempted, species used and can be affected by both genotypes and ploidy level of the species used. T. monococcum, ‘A’ genome contributor to the present day bread wheat with basic number x =7 was crossed with cultivated species of T. dicoccum (NP200, 2n=28), T. durum (MACS2846, 2n=28) and T .aestivum (Agra Local, 2n=42) to develop progenies with the characters of both the parents. The wild species was used as female parents and cultivated plants as male parents. Crossing T. monococcum as female with T. dicoccum, T. durum and T. aestivum did not result in seed set. The analysis done on these crosses to investigate the cause for failure revealed that it could be due to post-fertilization problems.