Genetic Diversity and Phylogenetic Relationships of Three Viruses Infecting Yam (Dioscorea Spp.) in Guinea Savanna Zone of Nigeria

Abstract The present study aimed to assess population structure and phylogenetic relationships of nine subspecies of Brassica rapa L. represented with thirty-five accessions cover a wide range of species distribution area using isozyme analysis in order to select more diverse accessions as supplementary resources that can be utilized for improvement of B. napus. Enzyme analysis resulted in detecting 14 putative polymorphic loci with 27 alleles. Mean allele frequency 0.04 (rare alleles) was observed in Cat4A and Cat4B in sub species Oleifera accession CR 2204/79 and in subspecies trilocularis accessions CR 2215/88 and CR 2244/88. The highest genetic diversity measures were observed in subspecies dichotoma, accession CR 1585/96 (the highest average of observed (H0) and expected heterozygosity (He), and number of alleles per locus (Ae)). These observations make this accession valuable genetic resource to be included in breeding programs for the improvement of oilseed B. napus. The average fixation index (F) is significantly higher than zero for the analysis accessions indicating a significant deficiency of heteozygosity. The divergence among subspecies indicated very great genetic differentiation (FST = 0.8972) which means that about 90% of genetic diversity is distributed among subspecies, while 10% of the diversity is distributed within subspecies. This coincides with low value of gene flow (Nm = 0.0287). B. rapa ssp. oleifera (turnip rape) and B. rapa ssp. trilocularis (sarson) were grouped under one cluster which coincides with the morphological classification.

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Time of planting and weed suppression abilities of some legumes intercropped with maize in the Guinea savanna zone of Ghana

Agriculture and Biology Journal of North America ◽

10.5251/abjna.2013.4.4.358.363 ◽

2013 ◽

Vol 4 (4) ◽

pp. 358-363

Author(s):

I. Lawson ◽

A. Issahaku,

Keyword(s):

Weed Suppression ◽

Guinea Savanna ◽

Savanna Zone

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DNA BARCODING USING COI GENE SEQUENCES OF WILD BETTA FIGHTING FISH FROM INDONESIA: PHYLOGENY, STATUS AND DIVERSITY

Indonesian Fisheries Research Journal ◽

10.15578/ifrj.26.2.2020.97-105 ◽

2020 ◽

Vol 26 (2) ◽

pp. 97

Author(s):

Melta R. Fahmi ◽

Eni Kusrini ◽

Erma P. Hayuningtiyas ◽

Shofihar Sinansari ◽

Rudhy Gustiano

Keyword(s):

Genetic Diversity ◽

Genetic Distance ◽

Dna Sequences ◽

Phylogenetic Relationships ◽

Gene Sequence ◽

Ornamental Fish ◽

Coi Gene ◽

Tree Construction ◽

In The Wild ◽

Blast Program

The wild betta fish is a potential ornamental fish export commodity normally caught by traders or hobbyists in the wild. However, the population of wild betta in nature has declined and become a threat for their sustainability. This research was conducted to analyze the genetic diversity, phylogenetic relationships, and molecular identification through DNA COI gene sequence of Indonesian wild betta fish. A total of 92 wild betta fish specimens were collected in this study. Amplification of COI genes was carried out using Fish F1, Fish R1, Fish F2, and Fish R2 primers. The genetic diversity and phylogenetic relationships were analyzed using MEGA version 5 software program. Species identification of the specimen was conducted using BLAST program with 98-100% similarity value of the DNA sequences to indicate the same species. Phylogenetic tree construction showed seven monophyletic clades and showed that Betta smaragdina was the ancestral species of genus Betta in Indonesian waters. Genetic distance among species ranged from 0.02 to 0.30, whereas intra-species genetic distance ranged from 0 to 6.54.

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