Abstract
In the present investigation 32 genotypes of rose (Rosa x hybrida) were evaluated to assess the nature and magnitude of genetic diversity. The genetic divergence of the genotypes was studied by using Mahalanobis D2 analysis. According to D2 values, the entire germplasm comprising of 32 genotypes was classified into seven distinct clusters. The larger clusters i.e. cluster I, II and V composed of seven genotypes while cluster III, IV, VI and VII have five, two, three and one genotypes respectively. The cluster means revealed the best cluster for various growth and flowering traits depending upon the aim of breeding, hence the potential lines can be selected from different clusters as parents in a hybridization programme. The divergence at inter and intra cluster level revealed the highest inter cluster distance between V and VII (D=7.863) whereas the lowest was found between II and VI (D=2.885). Cluster VII had the minimum intra cluster distance (D=0.250) while cluster III had the maximum intra cluster distance (D=2.889). The diversity observed within and between the clusters can be utilized in breeding of rose varieties/hybrids for desirable traits. Thus, genetic divergence can also be used as an indirect parameter in selecting parents to produce heterotic high yielding progenies.
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Claims 12
Claim · model-written summary
Thirty-two rose genotypes were classified into seven clusters.
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e0“the entire germplasm comprising of 32 genotypes was classified into seven distinct clusters”
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Claim · model-written summary
Clusters I, II and V each contained seven genotypes.
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e0“cluster I, II and V composed of seven genotypes”
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Cluster III contained five genotypes.
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e0“cluster III, IV, VI and VII have five, two, three and one genotypes respectively”
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Cluster IV contained two genotypes.
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e0“cluster III, IV, VI and VII have five, two, three and one genotypes respectively”
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Cluster VI contained three genotypes.
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e0“cluster III, IV, VI and VII have five, two, three and one genotypes respectively”
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Cluster VII contained one genotype.
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e0“cluster III, IV, VI and VII have five, two, three and one genotypes respectively”
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Claim · model-written summary
Cluster means identified different best clusters for growth and flowering traits, depending on breeding aim.
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e0“The cluster means revealed the best cluster for various growth and flowering traits depending upon the aim of breeding”
t0“rose”
Claim · model-written summary
The greatest inter-cluster distance was between V and VII, D=7.863.
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e0“the highest inter cluster distance between V and VII (D=7.863)”
t0“rose”
Claim · model-written summary
The lowest inter-cluster distance was between II and VI, D=2.885.
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e0“the lowest was found between II and VI (D=2.885)”
t0“rose”
e1“the highest inter cluster distance between V and VII (D=7.863)”
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Cluster VII had the minimum intra-cluster distance, D=0.250.
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e0“Cluster VII had the minimum intra cluster distance (D=0.250)”
t0“rose”
Claim · model-written summary
Cluster III had the maximum intra-cluster distance, D=2.889.
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e0“cluster III had the maximum intra cluster distance (D=2.889)”
t0“rose”
Claim · model-written summary
The authors proposed using diversity within and among clusters for rose breeding and parent selection.
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e0“The diversity observed within and between the clusters can be utilized in breeding of rose varieties/hybrids for desirable traits”