Ex-situ evaluation of genetic diversity in indigenous Nerium accessions
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https://doi.org/10.58993/ijh/2024.81.1.10Keywords:
Nerium oleander L., Phenotypic Coefficient of Variation, Heritability, Cluster analysis.Issue
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In the current investigation, 22 Nerium accessions gathered from different places in Tamil Nadu were evaluated. Regarding the assessment of accessions, a higher plant height of 209.25 cm was recorded in NI-13, and the greatest number of shoots per plant (7.40), plant spread in East-West direction (118.15 cm) and plant spread in North-South direction (123.85 cm) occurred in NI-16. The highest average leaf length (28.60 cm) was seen in Accession NI-1, whereas Accession NI-6 had the largest average leaf width (3.25 cm). Among the accessions, NI-13 recorded earliness in bud initiation (66.60). Accession NI-1 had the most flowers per spike (18.15), whereas accession NI-16 had the longest blooms (4.70) and highest individual flower weight (0.96 g) was recorded in the accession NI-3. Flower yield was highest in the accession NI-15 (4.10 kg) and the retentivity of the flowering rate were noted to be elevated in accession NI-1 (3.25 days). The PCA analysis revealed that four principal components showed 75.44% of total variation. From this, we identified that plant height, No. of shoots, plant spread (East-West) and plant spread (North-South), internode length, No. of spikes yield/plant/year, flower weight, and leaf width in different principal components are highly contributing traits for total variation. The clustering pattern was very effective, with a cophenetic correlation coefficient 0.705. The cluster analysis was displayed in four major clusters based on their specific geographical locations. The above-found accessions and traits could be utilized in the nerium varietal improvement programmes.Abstract
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