Genetic Diversity for Selection of Diverse Genotypes for Hybrid Breeding in Tomato (Solanum lycopersicum L.)

Author: K. Sushma*, P. Saidaiah, Harikishan Sudini, A. Geetha and K. Ravinder Reddy

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Abstract

An experiment was carried in tomato by using D2 analysis, the 23 genotypes were grouped into ten clusters. Based on the intra cluster distance, the intra cluster III had the maximum D2 value (102.28). Highest inter cluster generalized distance (597.76) was between cluster X and VIII indicating wider genetic diversity between these groups. The character number of fruits per plant contributed maximum (28.06 %) towards diversity by taking 71 times first ranking followed by ascorbic acid (16.60%) by 42 times. The remaining traits viz., days to first flowering, days to 50 % flowering, days to first harvest, days to last harvest and average fruit weight did not contribute to the total divergence. The genotypes performance and its characters with maximum contribution towards divergence should also be given due consideration, which appears as desirable in further crop improvement. Assessment of divergence in the germplasm is essential to know the spectrum of diversity so that improvement in fr

Keywords

Cluster analysis, Inter cluster, Intra cluster, D2 statistics, Genetic diversity, Tomato, Genotypes.

Conclusion

While maximum intra cluster distance was recorded in cluster IV and this might be due to limited gene exchange or selection practices among the genotypes for diverse characters. The maximum inter cluster distance was observed between cluster X and VIII are farthest, indicating wider genetic diversity. Hence, they should be selected for making cross combinations to deliver heterotic crosses to exploit yield.

References

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How to cite this article

K. Sushma, P. Saidaiah, Harikishan Sudini, A. Geetha and K. Ravinder Reddy (2022). Genetic Diversity for Selection of Diverse Genotypes for Hybrid Breeding in Tomato (Solanum lycopersicum L.). Biological Forum – An International Journal, 14(1): 440-444