Abstract
Randomly amplified polymorphic DNA (RAPD) markers, karyotypes and 4C DNA content were analyzed in five legume mangroves belonging to the sub-family Papilinoideae (Dalbergia spinosa, Derris heterophylla and D. indica) and Caesalpinioideae (Caesalpinia crista, Cynometra ramiflora) of the family Fabaceae to establish the genetic variability and phylogenetic affinities. Somatic chromosome numbers were reported for the first time in D. spinosa (2 n =20 ), C. ramiflora (2n=26) and D. heterophylla (2n=24) with reconfirmation of the somatic chromosome number in D. indica (2n=22) and C. crista (2n=24). Significant intergeneric and interspecific variation of 4C DNA content was observed and that varied from 8.970 pg in C. ramiflora to 28.730 pg in D. indica. From the RAPD analysis, the dendogram showed clustering of Caesalpinia crista and Cynomitra ramiflora into one group (81.80). In the second groups Derris indica and Derris heterophylla were more similar (83.10) than Dalbergia spinosa (85.80). Species-specific DNA markers (900 bp) obtained in D. spinosa from OPN15; 700 & 2000 bp in C. ramiflora from OPN4 and 400 and 800 bp in D. heterophylla and 500 bp DNA fragment in C. cristaobtained from OPN-11 were found characteristic RAPD markers of these species. C. cristafound more closer affinity to C. ramiflora of the sub-family Caesalpinioideae [genetic distance (1–F)=0.847]. Derris indica showed closer genetic relation with D. heterophylla [genetic distance (1–F)=0.856] than D. spinosa[genetic distance (1–F)=0.876] where Derrisand Dalbergia belongs to the sub-family Papilionoideae. By employing these markers the present study has helped to resolve the relationship between the taxonomically diverse leguminous mangroves and study their ability to coexist with mangroves that would shed light on the evolution of mangroves from terrestrial species.
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Jena, S., Sahoo, P., Mohanty, S. et al. Identification of RAPD markers, in situ DNA content and structural chromosomal diversity in some legumes of the mangrove flora of Orissa. Genetica 122, 217–226 (2004). https://doi.org/10.1007/s10709-004-2040-5
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DOI: https://doi.org/10.1007/s10709-004-2040-5