Evaluation of recombinant inbred lines (RILs) of bread wheat for thermo response at seedling stage

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dc.contributor.advisorYadava, Ramesh Kumar
dc.contributor.authorSharma, Vikas
dc.date.accessioned2016-11-19T09:33:38Z
dc.date.available2016-11-19T09:33:38Z
dc.date.issued2008
dc.description.abstractThe present study has been conducted to Evaluation of recombinant inbred lines (RILs) of bread wheat for thermo response at seedling stage. The seed weight (g), seed density (mg ml-3), shoot length (cm), root length (cm), seedling length, fresh weight (mg), dry weight (mg), vigour (I), vigour (II) and germination % in 100-RILs of Harrier x S308 wheat population were observed at three temperature conditions (15º, 20º and 25ºC) with two replications. The estimates of mean, components of genetic parameters (GCV, PCV,h2, genetic advance etc.) and correlation coefficients along with divergence analysis has been worked out after the establishment of substantial amount of variability in the present material. The estimates of h2 (BS) were high for almost for all traits. Genetic advance expressed as % of mean revealed the maximum scope of improvement is for shoot length at 15ºC. Correlation coefficient was indicated to be highest for dry weight and fresh weight at all the three temperatures, and was followed by seedling length with shoot length and that with vigour I at 15ºC; fresh weight with vigour II at 20º and 25ºC and that of dry weight with vigour I at 20ºC and with vigour II at 25ºC. Euclidean Clustering revealed that these RILs could be grouped in 9 clusters at 15ºC, where as in 8 clusters at 20ºC and 25ºC. Only one combination of RILs HS-135 & -136 had the tendency of grouping under same cluster across all the temperatures. Cluster II had maximum xii number of genotypes (24) at 15ºC whereas cluster III at 20ºC, and 25ºC had 20 and 19 genotypes respectively. The cluster VIII had the minimum number of RILs (two) at 15ºC where as four at both 20ºC and 25ºC in each case. At 15ºC RILs in cluster I were better for SL, RL, Se L, VI in cluster III were better for FW, GP, and that of cluster VIII were better for SW, SD, DW, VII as revealed by cluster means, RILs grouped in cluster I at 20ºC were better for RL, Se L, FW, DW, VI, VII; and that of cluster II were better for SW, SL, whereas in case of cluster III were better for SD, GP on the basis of cluster means. Likewise, RILs in cluster I were better for SW, SD; of cluster II being better for FW, DW, VII, GP, and that of cluster III as better for SL, RL, Se L, VI , as indicated by cluster means at 25oC. Consistently higher mean values at all the three temperatures has been recorded in HS 104 for fresh weight, HS 3 for vigour I & HS 51 for germination %, whereas the RIL HS 98 had consistently lower means in case of fresh weight, dry weight and vigour II, HS 99 for shoot length & HS 86 for dry weight at all the three temperatures. RILs specific for improving the traits, shoot length, root length, seedling length, fresh weight and the various seedling vigour parameters of wheat under diverse temperature conditions have been identified.en_US
dc.identifier.urihttp://krishikosh.egranth.ac.in/handle/1/86431
dc.language.isoenen_US
dc.publisherCCSHAUen_US
dc.subGenetics
dc.subjectSowing, Segregation, Developmental stages, Diseases, Crossing over, Genes, Seed treatment, Biological phenomena, Plant habit, Cropsen_US
dc.these.typeM.Sc
dc.titleEvaluation of recombinant inbred lines (RILs) of bread wheat for thermo response at seedling stageen_US
dc.typeThesisen_US
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