Study of Genetic Variability and Molecular Characterisation in Gulmohar [Delonix regia (Hook.) Raf.]
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Date
2013
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MPUAT, Udaipur
Abstract
A field experiment was conducted on 40 trees of gulmohar in completely randomized design with four age groups in and around the Jhalawar and Jhalarpatan cities during 2010-2011 to study their performance and genetic variability expressed among them under Jhalawar (Rajasthan) conditions.
The performance result of the trees depicted that AG4 showed the maximum tree height (10.25 m), maximum diameter at breast height (34.5 cm), maximum crown diameter (11.99 m), maximum number of flowers per panicle (35.41), maximum panicles per tree (103.7), largest flower size (11.90 cm), and longest duration of flowering (110.3 days). Genetic variability among the trees was estimated in terms of GCV, PCV, heritability and genetic gain for 16 characters. The value of PCV was higher than the GCV for all characters. The number of panicles per tree recorded high order estimates for GCV, PCV, heritability and genetic gain. Analysis of variance exhibited significant differences for tree height, diameter at breast height, crown diameter, number of flowers per panicle, number of panicles per tree, flower size and duration of flowering.
From the results based on molecular studies it could be concluded that 40 gulmohar trees were classified in 5 clusters through RAPD, ISSR and SSR markers and result showed that tree T22 which had the beautiful canopy was similar to T21 and falling in C cluster. Genotype T10 which had maximum crown diameter and ornamentally beautiful falling in cluster B and similar to the genotype T9. Genotype T34 was found to be most promising for aesthetic point of view due to its especially beautiful scarlet red coloured flowers with spreading canopy falling in cluster D. The trees occupied the same clusters indicating their genetic relatedness and origin from same or related sources. This indicated that molecular markers are least affected by environmental fluctuations and can be more precisely used in assessing genetic diversity and identification of genotypes.
Description
Study of Genetic Variability and Molecular Characterisation in Gulmohar [Delonix regia (Hook.) Raf.]
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Citation
Sharma and Moond, 2012