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Search Results: 1 - 10 of 195513 matches for " Ch.Sreelakshmi and D.Shivani "
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Genetic divergence and stability analysis in Pigeonpea (Cajanus cajan L.)
Ch.Sreelakshmi, D.Shivani and C.V.Sameer Kumar
Electronic Journal of Plant Breeding , 2010,
Abstract: Thirty Pigeonpea genotypes studied for genetic divergence using Mahalanobis D2 statistic indicated wider genetic diversity.Considerable variability was observed for days to 50% flowering, days to maturity, plant height, number of pods per plantand seed yield due to non-linear pooled deviation. The variability was low for number of primary branches per plant and testweight. Among the 7 characters studied, seed yield contributed the most (89.49%) towards the divergence of genotypesfollowed by number of pods per plant, days to 50% flowering and plant height. The genotypes were grouped into 8 clusters,maximum inter cluster distance being observed between the clusters III and VII (725.69). Hence, crossing of parents fromthese clusters would be desirable for combining earliness, short plant height, more primary branches per plant with more podnumber coupled with high seed yield. The genotypes ICPL 98008, ICPHAL 4979-2 and ICP 77303 were identified asdesirable and stable for days to maturity. Stability parameters along with per se performance across three kharif seasonsrevealed that ICPL 20036 and ICPL 20058 were stable genotypes for seed yield and were found to be suitable for low inputcultivation while, ICPL 13198 was found suitable for input rich cultivation.
Genetic analysis for yield and its components in hybrid pigeonpea
Ch.Sreelakshmi, C.V.Sameer Kumar and D.Shivani
Electronic Journal of Plant Breeding , 2011,
Abstract: Mahalanobis D2 statistics was applied to assess the divergence among the 36 hybrids and three checks of pigeonpea. The hybrids were grouped into nine clusters, where cluster I was the largest containing twenty one hybrids followed by cluster II with seven hybrids. The inter cluster distance was maximum between cluster III and VIII followed by III and VI and seed yield contributed the most (22.2) towards genetic divergence. High heritability coupled with high genetic advance as per cent of mean was noticed for seed yield, number of primary branches per plant and secondary branches per plant suggesting additive gene action controlling these traits. Seed yield showed positive correlation with all the characters studied except 100-seed weight. Genotypic path analysis revealed that the maximum direct effect on seed yield was exhibited by number of primary branches per plant, days to 50% flowering and number of pods per plant.
Gene effects, heterosis and inbreeding depression in Pigeonpea, Cajanus cajan L.
C.V.Sameer Kumar, Ch.Sreelakshmi and D.Shivani
Electronic Journal of Plant Breeding , 2012,
Abstract: The P1, P2, F1, F2, B1 and B2 of four pigeonpea, Cajanus cajan L. crosses were studied for eight metric traits. Individualscaling tests and joint scaling test indicated that an additive-dominance model was adequate in viz., PRG 100 x ICPL 87119,LRG 300 x ICP 8863 for number of primary branches per plant and LRG 300 x ICP 87119 for number of primary branches perplant and number of pods per plant. The results of the rest of the cases suggested the presence of additive, dominance andepistatic gene effects especially for the traits viz., seed yield and test weight.. Duplicate type of epistasis was prevalent in most ofthe cases. A substantial amount of heterobeltiosis over better parent (HBP) was revealed in all the four crosses for seed yield perplant and for most of its attributes. Inbreeding depression was also observed significant for days to 50% flowering, days tomaturity and number of clusters per plant in the cross PRG 100 x ICPL 87119 indicating the presence of dominance gene action.Suitable breeding strategies were suggested for the improvement of seed yield in pigeonpea.
Multiple criteria selection of crosses for improvement of yield in Safflower, Carthamus tinctorius L.
D.Shivani, Ch.Sreelakshmi and C.V. Sameer Kumar
Electronic Journal of Plant Breeding , 2010,
Abstract: The F1 along with parents of a 4 x 6 line x tester crosses in safflower were studied and seven parameters, i.e., D27 based on 7characters and D24 based on yield and its 3 direct componenets and mid parent value (MP-Y), F1 mean (F1-Y), relativeheterosis (RH-Y), biparental average GCA (MPGCA-Y) and SCA effect (SCA-Y) for yield were estimated. Twenty fourselected crosses were studied for segregation for yield in F2. Thirteen combinations were as criteria for selection of crosses.The predictivity of a selection criteria was assessed by correlation and regression of F2DS7 on the DS of selection criteria.The usefulness of individual parental and F1 parameters as selection criteria was also assessed. Among the single parametercriteria, D24 based on yield and its direct components gave the highest R2 of 39.71%, followed by MP-Y (39.46%) and F1-Y(35.60%). Eight of the thirteen multiple criteria proved to be better predictor of F2DS7 than the best single parameter criterionMP-Y. The multiple criterion DS (2,4,6) based on D24 and F1 mean and biparental average GCA for yield was found to be thebest criterion fro selection of crosses for yield improvement in safflower.
Combining ability studies and heterosis for yield and its component traits in safflower [Carthamus tinctorius L.)]
D.Shivani, Ch.Sreelakshmi and C.V. Sameer Kumar
Electronic Journal of Plant Breeding , 2011,
Abstract: Evaluation of parents and F1s derived from crossing four well adapted lines and six testers in a line x tester fashion revealed that variance due to sca had higher magnitude than gca variance for all the traits studied indicating that these traits are under the influence of non additive gene action. The line Sagarmuthyalu and tester ASD-07-09 revealed significant gca effects for seed yield per plant. The tester ASD-07-10 recorded significantly negative gca effect for days to 50% flowering. The cross Manjira x GMU 1946, Manjira x SSF 698 and Sagarmuthyalu x ASD-07-09 recorded significantly high sca for seed yield per plant. The cross combinations Manjira x GMU 1946, Sagarmuthyalu x ASD-07-09 and Manjira x SSF 698 exhibited significant and positive heterobeltiosis and standard heterosis for seed yield per plant. These crosses also had significant and positive heterosis for number of capitula per plant, number of seeds per capitulum and test weight and would be more desirable to exploit heterosis in safflower.
Genetic Divergence Studies in Safflower, Carthamus tinctorius L.
D. Shivani, Ch.Sreelakshmi and C.V.Sameer Kumar
Electronic Journal of Plant Breeding , 2010,
Abstract: The present study was carried out to study the genetic divergence among 75 germplasm lines of safflower. Analysis ofvariance revealed significant variation among the genotypes for all the characters studied. Among the genotypes, GMU 3327,GMU 3279, GMU 3325 and GMU 3313 were found to be promising on the basis of per se performance for seed yield. Seedyield exhibited maximum contribution towards genetic divergence followed by number of capitula per plant, number of seedsper capitulum, oil content, days to 50% flowering and days to maturity. The genotypes were grouped into 8 clusters out ofwhich cluster II is having maximum of 23 genotypes followed by cluster I with 20 genotypes. Maximum inter cluster distancewas observed between clusters VII and VIII followed by clusters VI and VIII, clusters IV and VIII and clusters I and VIII .
Genetic analysis of F2 and transgressive segregants for seed yield in safflower (Carthamus tinctorius L.)
D.Shivani, Ch. Sreelakshmi and C.V. Sameer Kumar
Electronic Journal of Plant Breeding , 2011,
Abstract: The wide range of F2 variability for seed yield, number of capitula per plant and number of seeds per capitulum in 24 crosses ofline x tester set indicated potential of the crosses to throw large number of variable segregants. Maximum number of positivetransgressive segregants was found in TSF-1 x SFS 9920, TSF-1 x SSF 658, TSF-2 x ASD-07-10, Sagarmutyalu x SFS 9920andManjira x SSF 698 crosses. F1 per se performance, relative heterosis, D2 and GCA effects of parents were found to be goodindicators for predicting the phenotypic variance and genetic advance for seed yield in F2. Average GCA effects of parents hadmoderate degree of influence on the mean of 10% top yielding plants in F2.
Canonical variate analysis in safflower (Carthamus tinctorius L.)
D.Shivani*, Ch. Sreelakshmi and C.V. Sameer Kumar
Electronic Journal of Plant Breeding , 2011,
Abstract: Seventy five genotypes of safflower representing the broad spectrum of variation were assessed for genetic divergence for eightcharacters using Mahalanobis D2 statistic and principal component analysis. The seed yield contributed maximum towards thetotal genetic divergence followed by test weight and number of seeds per capitulam. On the basis of clustering method, twelveclusters were obtained for D2 statistic. The best clusters with regard to seed yield and oil content were cluster XII and cluster II,respectively. Principal component analysis identified three principal components which explained 83.02% variability. GenotypesGMU 3470, GMU 3484, GMU 3499, A-1, JSF-1 and GMU 3475 (based on PCI axis) were divergent.
Heterosis and inbreeding depression for yield and yield components in safflower (Carthamus tinctorius L.)
D.Shivani, Ch. Sreelakshmi and C.V. Sameer Kumar
Electronic Journal of Plant Breeding , 2010,
Abstract: The results of the experiment on the magnitude of heterosis and inbreeding depression in 38 genotypes (15 F1s, their 15 F2s and 8 parents) foryield and its attributes revealed highly significant variations for all the genotypes and for all the characters studied. Two hybrids for earlinessand four hybrids for short stature exhibited significant negative standard heterosis, while four hybrids for number of capitula per plant, sevenhybrids for number of seeds per capitulum, five hybrids for test weight and three hybrids for seed yield exhibited significant positive standardheterosis. There was positive inbreeding depression in F2 generation for all the characters in majority of the hybrids. There was non significantheterosis and inbreeding depression for oil content in F1 and F2 generations respectively.
Genetic analysis of yield and its component traits in drought tolerant genotypes of pigeonpea (Cajanus cajan L. Millspaugh)
Ch. Sreelakshmi, C.V. Sameer Kumar and D. Shivani
Electronic Journal of Plant Breeding , 2010,
Abstract: In the present investigation, sufficient variability was observed in the drought tolerant pigeonpea genotypes for the traits under study. Most of theyield contributing characters showed significant positive correlation whereas, number of primary branches per plant showed significant negativecorrelation with seed yield. Days to maturity had maximum direct effect on seed yield followed by number of pods per plant and plant height andnumber of secondary branches which had negative direct effect on seed yield. Number of secondary branches per plant, number of pods per plantand days to maturity were identified as important yield components and hence, selection should be focused on these traits to improve yield indrought tolerant genotypes of pigeonpea.
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