A total of 24 candidate plus trees（CPTs） of Pongamia pinnata（L.） Pierre.were selected to elucidate their variation and diversity based on thirteen quantitative traits（4 pod traits,6 seed traits of parent trees an...A total of 24 candidate plus trees（CPTs） of Pongamia pinnata（L.） Pierre.were selected to elucidate their variation and diversity based on thirteen quantitative traits（4 pod traits,6 seed traits of parent trees and 3 progeny traits） at Forest Research Centre,Institute of Forest Productivity-Mandar,Ranchi district during 2005-2007.The results show that,CPT-19 had maximum for seven traits viz,pod length（65.6 mm）,100-pod weight（542.4 g）,seed 2D（two dimension） area（351.2 mm2）,seed length（27.9 mm）,seed breadth（17.4 mm）,100-seed weight（217.9 g） and plant height（164.3 cm）.The traits,100-pod weight and 100-seed weight had a high heritability（98.4%,96.9%） accompanied with high genetic advance（46.0%,34.9%）.There is a positive significant correlation between 100-pod weight and 100-seed weight traits at both genotypic and phenotypic levels with plant height,collar diameter and volume index at 30 MAS（months after sowing）.Volume index expressed a moderate heritability（47.4%） accompanied with high genetic advance（48.4%）,indicating that the character is governed by additive gene effects.In divergence study,24 accessions were grouped into 6 clusters on the basis of non-hierarchical euclidian cluster analysis.The genotypes in cluster IV（CPT-5,CPT-6,CPT-7,CPT-12,CPT-16,CPT18,CPT-22） and cluster III（CPT-4,CPT-8,CPT-9,CPT-20,CPT-21） were most heterogeneous and can be best used within group hybridization.The wide diversity exists between the cluster V and II,followed by cluster II and I and crosses between CPTs of these clusters may result in substantial segregates.It is revealed that the existence of substantial variation and diversity can be utilized for genetic resource conservation and further tree improvement programmers of the species.展开更多
Madhuca latifolia Macb.commonly known as Indian butter tree,is an open-pollinated plant.Improvement in seed and oil yields depends on the progress in the desired characters in the base material and the genetic variabi...Madhuca latifolia Macb.commonly known as Indian butter tree,is an open-pollinated plant.Improvement in seed and oil yields depends on the progress in the desired characters in the base material and the genetic variability available in the collected germplasm.We evaluated 23 genotypes of M.latifolia to understand genetic variability,character association and divergence in seed traits and oil content for use in breeding programs.Variation was recorded in seed length（27.3–38.6 mm）,seed breadth（15.6–19.1 mm）,two dimensional（2D） surface area（328.3–495.4 mm2）,100 seed weight（216.8–285.3 g）,acid value（13.4–25.8 mg KOH/g）,iodine number（62.4–78.6） and oil content（37.8–51.0 %）.High estimates of genotypic coefficient of variation,broad senseheritability and genetic gain were observed for seed oil content.Variability studies for seed traits revealed that genotype CPT-16 had the highest 100-seed weight（281.5 g） and oil content（51 %）.Highly significant genotypic and phenotypic correlations were observed.The100-seed weight was positively and significantly correlated with oil content at both phenotypic（r = 0.57） and genotypic（r = 0.60） levels.Cluster analysis of the scores of the first three principle components（80.83 %） resulted in four clusters,consisting of 4,7,3 and 9 genotypes in the first,second,third and fourth clusters,respectively.Cluster 3was distinguished from others based on significantly higher means for most seed traits except seed breadth,acid value,iodine number and oil content.Cluster 1 appeared more divergent as it had significantly higher means for acid value and iodine number.A comparative assessment of means of the four clusters for 100-seed weight and oil content suggested that cluster 3 would be useful for higher 100-seed weight and oil content.Hence these genotypes,CPT-3,CPT-6 and CPT-15 in cluster 3 can be used for direct selection and utilization in breeding programs.展开更多
文摘A total of 24 candidate plus trees（CPTs） of Pongamia pinnata（L.） Pierre.were selected to elucidate their variation and diversity based on thirteen quantitative traits（4 pod traits,6 seed traits of parent trees and 3 progeny traits） at Forest Research Centre,Institute of Forest Productivity-Mandar,Ranchi district during 2005-2007.The results show that,CPT-19 had maximum for seven traits viz,pod length（65.6 mm）,100-pod weight（542.4 g）,seed 2D（two dimension） area（351.2 mm2）,seed length（27.9 mm）,seed breadth（17.4 mm）,100-seed weight（217.9 g） and plant height（164.3 cm）.The traits,100-pod weight and 100-seed weight had a high heritability（98.4%,96.9%） accompanied with high genetic advance（46.0%,34.9%）.There is a positive significant correlation between 100-pod weight and 100-seed weight traits at both genotypic and phenotypic levels with plant height,collar diameter and volume index at 30 MAS（months after sowing）.Volume index expressed a moderate heritability（47.4%） accompanied with high genetic advance（48.4%）,indicating that the character is governed by additive gene effects.In divergence study,24 accessions were grouped into 6 clusters on the basis of non-hierarchical euclidian cluster analysis.The genotypes in cluster IV（CPT-5,CPT-6,CPT-7,CPT-12,CPT-16,CPT18,CPT-22） and cluster III（CPT-4,CPT-8,CPT-9,CPT-20,CPT-21） were most heterogeneous and can be best used within group hybridization.The wide diversity exists between the cluster V and II,followed by cluster II and I and crosses between CPTs of these clusters may result in substantial segregates.It is revealed that the existence of substantial variation and diversity can be utilized for genetic resource conservation and further tree improvement programmers of the species.
基金supported by National Bank for Agriculture and Rural Development(NABARD),Mumbai,in the form of Research and Development grants
文摘Madhuca latifolia Macb.commonly known as Indian butter tree,is an open-pollinated plant.Improvement in seed and oil yields depends on the progress in the desired characters in the base material and the genetic variability available in the collected germplasm.We evaluated 23 genotypes of M.latifolia to understand genetic variability,character association and divergence in seed traits and oil content for use in breeding programs.Variation was recorded in seed length（27.3–38.6 mm）,seed breadth（15.6–19.1 mm）,two dimensional（2D） surface area（328.3–495.4 mm2）,100 seed weight（216.8–285.3 g）,acid value（13.4–25.8 mg KOH/g）,iodine number（62.4–78.6） and oil content（37.8–51.0 %）.High estimates of genotypic coefficient of variation,broad senseheritability and genetic gain were observed for seed oil content.Variability studies for seed traits revealed that genotype CPT-16 had the highest 100-seed weight（281.5 g） and oil content（51 %）.Highly significant genotypic and phenotypic correlations were observed.The100-seed weight was positively and significantly correlated with oil content at both phenotypic（r = 0.57） and genotypic（r = 0.60） levels.Cluster analysis of the scores of the first three principle components（80.83 %） resulted in four clusters,consisting of 4,7,3 and 9 genotypes in the first,second,third and fourth clusters,respectively.Cluster 3was distinguished from others based on significantly higher means for most seed traits except seed breadth,acid value,iodine number and oil content.Cluster 1 appeared more divergent as it had significantly higher means for acid value and iodine number.A comparative assessment of means of the four clusters for 100-seed weight and oil content suggested that cluster 3 would be useful for higher 100-seed weight and oil content.Hence these genotypes,CPT-3,CPT-6 and CPT-15 in cluster 3 can be used for direct selection and utilization in breeding programs.
