Search

Sixty different varieties of brinjal (Solanum melongena L.) were evaluated for character association. The findings showed that the genotypic correlation was higher than the phenotypic correlation coefficient for most traits. Strong positive correlation was observed between the number of fruits per plant, branches per plant, and fruit yield per plant. Positive correlation was observed between moisture content and fruit characteristics, such as fruit volume and average fruit weight. The path coefficient analysis revealed that high positive direct effect on fruit yield was exerted by fruits per plant, followed by moisture content. [ABSTRACT FROM AUTHOR]

A study was carried out to assess character association and genetic diversity among green gram genotypes. The results of correlation coefficient analysis revealed a significantly positive correlation for the traits viz., plant height, number of primary branches, number of clusters per plant, pod length, and number of seeds per pod with single plant yield. The path analysis revealed that the number of pods per plant, number of seeds per pod, and hundred seed weight had the highest positive direct contribution to single plant yield. Pod length showed a low indirect contribution to the total variance and all other traits showed a negative contribution to total variance. [ABSTRACT FROM AUTHOR]

Sunflower production can be increased by exploring genetic variability present in the population. The nature of relationship between yield and its associated traits should be clearly understood to achieve parallel improvement of yield by indirect selection of beneficial traits. In the present study, 50 sunflower accessions along with five checks were evaluated for nine biometrical traits viz. days to 50% flowering, days to maturity, plant height, head diameter, hundred seed weight, volume weight, hull content, oil content and single plant yield to assess the variability and character association. The analysis of variance revealed the presence of significant variation among the genotypes for all the traits under consideration. Phenotypic coefficient of variation and genotypic coefficient of variation values were high for hundred seed weight and single plant yield. High heritability along with high genetic advance was observed for the traits viz. days to 50% flowering, plant height, head diameter, volume weight, oil content, hundred seed weight and single plant yield. Correlation studies revealed the presence of a positive and significant correlation between single plant yield and the traits head diameter and hundred seed weight. Similarly, oil content exhibited a positive and significant correlation with head diameter and volume weight. Path analysis also indicated the presence of high and moderate positive direct effect of head diameter and hundred seed weight on single plant yield. Based on the above, head diameter and hundred seed weight could be used as selection indices for yield improvement in sunflower. [ABSTRACT FROM AUTHOR]

A study was carried out to understand the genetic variability and trait association in a set of 30 naturally coloured cotton hybrids along with their parents (five colour cotton and six white cotton parents). The Analysis of Variance revealed the significance of the mean square for most of the traits studied. The phenotypic coefficient of variation was more than that of the genotypic coefficient of variation for all the traits. High PCV and GCV were recorded for the traits number of monopodia and single plant yield. The heritability and genetic advance as percentage of mean (GAM) were high for the traits plant height, number of monopodia, number of bolls per plant, single boll weight, bundle strength, fibre fineness and single plant yield. The Number of sympodia, number of bolls per plant and boll weight were observed to have significant genotypic and phenotypic correlation with single plant yield, while upper half mean length was observed to have significant genotypic and phenotypic correlation with bundle strength and fibreelongation. Path analysis revealed that seed index and ginning out turn recorded very high direct effect with single plant yield. [ABSTRACT FROM AUTHOR]

A study was carried out to assess the genetic variability and association among yield attributing traits in 60 different safflower genotypes over six environments. The pooled analysis of variance (ANOVA) revealed that all attributes had a considerable degree of variation. The pooled analysis of variability parameters revealed that the phenotypic coefficients of variation (PCV) was higher than the genotypic coefficients of variation (GCV)for all of the characteristics evaluated, indicating that experimental variance contributed to total variation. Petal yield/plant and seed yield/plant had the highest PCV and GCV followed by number of capitula/plant, number of seeds/capitula, height of insertion of first branch, hundred seed weight, number of primary branches/plant, length of longest primary branches, number of secondary branches and height up to main capitula. Number of capitula/plant, seed yield/plant, petal yield/plant, height of insertion of first branch, number of seeds per capitula, hundred seed weight, number of primary branches/plant, length of the longest primary branches, number of secondary branches, height upto main capitula, capitulum diameter and plant height all had high heritability and genetic advance as percent of mean. Seedyield/plant showed positive, significant and directcorrelation with number of capitula/plant, number of seeds/capitulum, height up to the main capitulum, plant height, number of primary branches/plant, capitulum diameter, and hundred seed weight. Number of capitula/planthad the maximum direct effect on grain yield/plant followed by number of seeds/capitulum, hundred seed weight and petal yield/plant. Hence selection of these traits would improve seed and petal yield in safflower breeding program. [ABSTRACT FROM AUTHOR]

Thirty-seven genotypes of coriander including six check varieties were analyzed for variability, correlation, path coefficients, and genetic divergence. Genotypes were grown in RBD with three replications and observations were recorded for 13 different quantitative traits. Secondary branches per plant and total oil content confirmed high values of GCV and PCV. Seeds per umbel, test weight, and total oil content exhibited high heritability along with high GA (% of mean). Both genotypically and phenotypically, seed yield per plant exhibited a positive and significant association with umbels per plant, umbellates per umbel, test weight, and harvest index. On seed yield per plant, umbels per plant reported the highest positive direct effect. Genetic diversity analysis grouped the 37 coriander genotypes into 6 different clusters with the maximum inter-cluster distance seen between clusters III and VI. Among the thirteen traits, test weight contributed largely to the total genetic divergence. [ABSTRACT FROM AUTHOR]

Fifty two genotypes of Indian bean were examined for the genetic variability parameters and trait correlation for 11 yield contributing traits in F5 progenies. Analysis revealed that these genotypes had a considerable level of diversity. The magnitude of GCV and PCV was high for seed yield per plant, which indicated the potential for selection based genetic enhancement. The GCV and PCV values were moderate for pod weight, pods width and pod length. High heritability along with high genetic advance as per cent mean was recorded for pod width, pod length, pod weight and seed yield per plant. The seed yield per plant had a significant positive correlation with pod weight, plant height, pod length, pod width and seeds per pod. The overall genotypic path analysis revealed that racemes per plant exhibited the highest positive direct effects on seed yield per plant followed by direct effects of pod length, pods per raceme, pod width and pod weight. Therefore, simple selection is advised for pod length, pod width and pod weight to boost the yield of the Indian bean. Based on mean values, the progenies W-19-26, W-19-22 and W-19-25 of GNIB-21 × GP-167 among all crosses had shown significantly higher seed yield over the check varieties GNIB-21 and GNIB-22 and hence identified as elite genotypes. [ABSTRACT FROM AUTHOR]

An experiment was conducted with 39 rice genotypes to screen for salt tolerance and evaluate potential variation among the genotypes under sodic conditions. All the 39 rice genotypes along with two check varieties (TRY2 & TRY5) were screened in vitro for salt tolerance by imposing 100 mM NaHCO3 at the seedling stage under hydroponics and a salt injury score was given based on morphological symptoms. Observations on 12 biometrical traits were recorded under field sodic conditions and subjected to variability analysis. The ANOVA revealed that there was a significant difference for the 11 traits among the genotypes except for flag leaf breadth. Among the genotypes, the highest single plant yield was recorded by RG 50 (36.83 g). A correlation study revealed that, single plant yield exhibited significant and positive genotypic and phenotypic relation with panicle harvest index, the number of grains per panicle and panicle length. Path analysis showed that the traits viz., panicle harvest index, plant height and panicle length had a very high and positive direct effect on single plant yield. The traits viz., flag leaf breadth, SPAD meter reading and number of productive tillers per plant had a high and positive direct effect on single plant yield. In vitro studies revealed that the genotype RG113 was found to be highly tolerant to salt stress and it also showed a significantly higher yield (35.42 g) under field sodicity. The genotypes RG22, RG150, RG162 and RG188 which showed tolerance under in vitro screening and the moderately tolerant genotypes RG26, RG50, RG95, RG107, RG123 and RG176 were exhibiting significant yield under field sodicity conditions. Therefore, in order to breed for high yielding salt-tolerant rice varieties, the identified genotypes could be exploited as donor genotypes. [ABSTRACT FROM AUTHOR]

The present study was carried out in a set of germplasm accessions for yield related traits in Chia. Results of the correlation coefficient revealed a highly significant and positive effect of the number of primary branches, harvest index and oil content on seed yield per plant on both genotypic and phenotypic levels, while plant height had a positive significant correlation with seed yield only at the genotypic level. Through analysis of path coefficients, the positive and significant direct effect of harvest index on genotypic as well as phenotypic levels was inferred, whilst days to 50% flowering and plant height illustrated positive direct effects on seed yield per plant only at the genotypic level. Moderate direct and positive effects of days to maturity at the genotypic level along with the number of primary branches at the phenotypic level were observed on seed yield per plant. The study revealed that harvesting index, days to 50% flowering and fruiting branches could be used as selection criteria traits, which will be very useful in future breeding programmes to enhance yield in Chia. [ABSTRACT FROM AUTHOR]

Fifteen cluster bean genotypes including the parent MDU 1 and fourteen determinate M5 generation cluster bean mutants were evaluated to determine the correlation and path analysis among yield and yield attributing characters. The genotypic correlation coefficient was observed to be higher in magnitude than the phenotypic correlation coefficient for most of the characters studied. The correlation analysis indicated the positive association of pod yield per plant with plant height, number of clusters per plant, total number of pods per plant, pod length, pod girth, pod weight, days to last harvest and number of seeds per plant. The path coefficient analysis indicated that the number of clusters per plant exhibited a very high positive direct effect on pod yield per plant at the genotypic level. ACMC-020-10 was identified as the best determinate mutant of MDU 1. [ABSTRACT FROM AUTHOR]

Sorghum is a universal crop grown for its diversified end uses. A total of 250 plants of F2 generation were evaluated for nine quantitative characters of cross made between Paiyur 2 and Kottathur local 5. The minimum difference was observed between the phenotypic coefficient of variation and genotypic coefficient of variation for all the traits which reveals that the effect of environment was minimum on the expression of the character. High PCV was observed for plant height (20.36%), test weight (23.59%), and single plant yield (44.52%). Low PCV was observed for days to fifty percent flowering (9.80%), days to maturity (6.54%) and number of leaves (7.14%). High heritability accompanied with genetic advance was observed for plant height (h²=99.03%; GAPM=41.55%), leaf length (h²=97.87%; GAPM=23.70%), stem diameter (h²=94.49%; GAPM=27.36%), test weight (h²=99.03%; GAPM=48.13%), and single plant yield (h²=99.57%; GAPM=91.33%) and it indicates that the characters are under the additive gene action and suitable for the selection process. Plant height (0.6115) recorded positive significant correlation with single plant yield and hence selection towards the plant height directly improves the yield. Plant height (0.6132) and test weight (0.297) showed positive direct effect on single plant yield which indicates that the selection towards these characters will improve the yield. [ABSTRACT FROM AUTHOR]

An experiment on correlation and path analysis involving thirty F1 and six parents of brinjal (Solanum melongena L.) was carried during rabi, 2018 at Horticultural College and Research Institute, Tamil Nadu Agricultural University, Coimbatore. The genotypic correlation coefficient was higher in magnitude than the corresponding phenotypic correlation coefficient for most of the characters. The fruit yield per plant had exhibited a highly significant and positive correlation with fruit length (0.837) and the number of fruits per plant (0.716). The genetic improvement of fruit yield thus can be obtained by selection for these yield components. Path coefficient analysis revealed that the characters viz., the number of fruits per plant (0.962), days to first harvest (0.922) and fruit girth (0.616) had a high positive direct effect on fruit yield per plant. Thus, the fruit yield per plant can be improved by making the selection of these traits in the yield improvement programme. [ABSTRACT FROM AUTHOR]

The present study was consisted of 100 urdbean genotypes grown at two locations i.e. at Punjab Agricultural University, Ludhiana and its Regional Research Station, Gurdaspur during Summer, 2019. In principal component analysis, first four PCs possessed Eigen value more than 1 and revealed 73.29% and 66.43 % variability at Ludhiana and Gurdaspur respectively. PCA analysis suggested the importance of biological yield per plant, plant height, days to 50% flowering, harvest index, yield per plant and pods per plant to speed up the urdbean improvement. The correlation studies suggested significantly positive association of clusters per plant, pods per plant, biological yield per plant and harvest index with grain yield per plant at both locations. Path analysis indicated that harvest index, biological yield per plant, nodes per plant, branches per plant showed the higher and positive direct effect on seed yield at both locations. Direct selection of genotypes with positively correlated characters can be considered useful for increasing seed yield. [ABSTRACT FROM AUTHOR]

Twenty five genotypes of cauliflower along with one check Madhuri were evaluated for yield and some yield contributing morpho physiological components in cauliflower. Further, the investigation was done to find out interrelationships among different characters and their direct and indirect contribution towards yield. Estimates of phenotypic and genotypic correlation coefficient revealed that marketable yield per plant was significantly and positively correlated with curd size index, gross weight per plant, curd solidity, curd compactness, curd diameter, stalk length, number of leaves per plant and harvest index. The high positive direct effect on marketable yield per plant was exhibited by curd size index, gross weight per plant, days to marketable curd maturity from date of transplanting, curd solidity, stalk length and per cent marketable curds. Therefore, these traits should be considered as the selection criterion to improve the marketable yield per plant. [ABSTRACT FROM AUTHOR]

The present investigation was conducted to magnitude the genetic variability, heritability and genetic advance in snake gourd for identifying desirable parents. Fifty genotypes were evaluated for eleven characters through RBD during the year 2011–12. The phenotypic coefficient of variance (PCV) was slightly higher than their corresponding genotypic coefficient of variance (GCV) for all characters. Highest GCV and PCV values were observed for characters like fruit length, fruit weight and number of fruits per plant. Moderate phenotypic coefficient of variation and genotypic coefficient of variation for yield, fruit girth and number of seeds per fruit indicated the presence of high genetic variability for these traits in the material. High heritability along with high genetic advance observed for fruit length, yield, fruit girth and number of fruits per plant. Fruit yield had significant positive genotypic and phenotypic correlation with number of fruits per plant, fruit girth and vine length. Path coefficient analysis showed that fruit weight had maximum direct effect followed by number of fruits per plant. For selecting high yielding genotypes emphasis should be given on number of fruits per plant, fruit length, fruit weight, fruit girth and vine length. [ABSTRACT FROM AUTHOR]

Twenty-six genotypes of adzuki bean were evaluated at the experimental farm of the Department of Crop Improvement, CSK HPKV, Palampur, in RBD with three replications during kharif, 2007. Data were recorded on the nine yield traits and ten growth parameters. Significant positive correlation and high genotypic correlation of aerial biomass at maturity, yield/day, yield/day with respect to reproductive phase, biomass/day to plant growth, pods/plant, AGR and LAD with seed yield/plant were observed. It was found through path analysis that yield/day and AGR had high direct effect on seed yield at genotypic and phenotypic levels. Plant height, pod length, pods/plant, seeds/pod, harvest index, aerial biomass at maturity, yield/day, yield/day with respect to reproductive phase, biomass/day to plant growth, leaf area and 100-seed weight had also contributed indirectly and positively through yield/day towards seed yield/plant. AGR besides having direct effect also showed indirect effect through pods/plant whereas LAD showed only indirect effect in combination through AGR. Therefore, selection, if practiced for AGR, would prove to be more effective for bringing about improvement in seed yield in adzuki bean. Based on the present studies, two adzuki bean genotypes viz., HPAB -27 and HPAB-30 were found highest yielding and having better combination of the yield and its component traits among all the genotypes. [ABSTRACT FROM AUTHOR]

Aquilaria malaccensis Lam. is one of the important species to produce resin-impregnated heartwood that is fragrant and highly valuable and traded internationally. A field experiment was laid out in RBD by using plants raised from 22 provenances collection of Aquilaria malacanssis from 3 states of North-Eastern hill regions of India. The genotypes viz., MDLY, NHJA and KHOW-1 recorded significantly higher values than the rest of the genotypes. Genotypic coefficients of variability were less than phenotypic coefficient of variability. Maximum variability was observed for volume index (18.98) followed by number of branches (16.78). Collar diameter (2.465) was recorded as minimum GCV value. Volume index (21.35) was registered maximum PCV followed by number of branches (17.85). High heritability was observed for plant height (0.966) followed by number of branches (0.883) and volume index (0.790). Minimum genetic advance was estimated for collar diameter (2.284%) and maximum for volume index (34.75%). Plant height was significant and positively correlated with volume and collar diameter at phenotypic and genotypic level. Collar diameter showed positive and highly significant correlation with volume index. The path analysis indicated that plant height and collar diameter has maximum direct effect on volume index. This study reveals that selection of better plants with higher variability and other juvenile growth traits of Aquilaria malaccansis provenances is suitable to grow in South Indian condition. And also these characters shoud be used as selection criterion for further improvement of yield in Aquilaria malaccansis. [ABSTRACT FROM AUTHOR]