Twenty-four accessions of twelve species minor legumes collected from the germplasm unit of the International Institute of Tropical Agriculture Ibadan, Nigeria were evaluated for their genetic diversities and phylogenetic relatedness. The accessions were planted into plots of 5 ridges of 5 meters long, spaced 1 meter apart and replicated three times at the Federal University Oye-Ekiti Teaching and Research Farm. The diversity and the relative phylogeny of the accessions were assessed through their floral morphological differences and the mean values between two accessions were evaluated by descriptive statistics. Principal component analysis was employed to identify the most discriminatory floral morphological traits and the similarities among the 24 accessions were assessed by cluster analysis (CA). Descriptive statistics through Duncan multiple range test adopted revealed genetic diversity and phylogenetic relatedness among the accessions. The first two principal component axes explained 64.66% of the total floral morphological variation. Standard petal length, calyx lobe length and stipule length contributed most of the variations in the legume accession. CA grouped the 24 accessions into six clusters. The study revealed intra-specific similarities and inter-specific floral morphological differences among the studied accessions.
This study evaluated genetic variability and heritability in vegetative and floral characters among two minor legumes (Sphenotylis stenocarpa Ex. A. Rich. Harms and [Cajanus cajan (L.) Millsp.] of five accessions each. Six (6) floral and ten (10) vegetative characters were pooled for analysis on one hundred (100) plants of the two minor legumes. Appropriate statistical analyses were employed for comparative evaluation. Significant differences (P = 0.05) were observed in all the traits except rachis length. Principal Component Analysis (PCA) revealed significant contributions of traits in lengths of calyx lobe, stipule, rachis and petiole; also in numbers of flowers per peduncle and of main branches to the expressed variability. The cluster analysis segregated the accessions into two major cluster groups. The broad sense heritability of traits was high (>95 %). The study is important in selection of valuable traits for conservation, management of genetic resources and hybridization programs of the two species.
The study was carried out to investigate the responses of drought stress on wheat tissues. Five wheat cultivars Alta 84 (AL), Atila (AT), Cettia (CE), Norman Bourgluk 2008 (NB) and Seri M82 (SE) were cultivated. Four weeks after planting, healthy plants were subjected to four treatments viz-well-watered (D1), watered daily, drought stress (D2), one weekly watering, drought stress (D3), two weekly watering and drought stress (D4), and three weekly watering. The experiment was a factorial experiment conducted in a completely randomized design (CRD) with three replicates; Transverse section (TS) of the leaves collected were sectioned using microtome, stained and observed under compound microscope. Mesophyll cells, vascular bundles, bundle sheaths and xylem tissues were measured using ocular micrometer. Epidermal peels were prepared to determine the number of stomata and trichomes. When drought stress was imposed (D2, D3 and D4), wheat cultivar Cettia developed larger mesophyll cells, xylem tissues, vascular bundles and bundle sheaths than other cultivars. Thus, larger vascular bundles would facilitate faster movement of water and mineral salts up to the shoot from the root. Cultivar Atila developed higher number of trichomes during drought stress D2 than other cultivars which help to reduce the rate of transpiration of water out of the epidermal leaves. Wheat cultivars Cettia and Atila could be drought tolerant cultivars. Generally, wheat cultivars developed stable stomata number and stomata closure mechanism to cope with drought stress. There was an increase in number of trichomes at D2, D3 and D4 which revealed the ecologically adaptation of wheat plants to drought stress.
African indigenous vegetables need to be improved for yield and nutrient enhancement. This can initially be done through germplasm characterization to know the pattern of genetic diversity for germplasm collection, conservation, and plant breeding programme. This research work was carried out to elucidate the diversity present in forty genotypes of okra in Nigeria as regards their qualitative and quantitative traits together with their mineral elements using cluster analysis and principal component analysis so as to help breeders in crop improvement programmes to select appropriate parents to produce new and better varieties. The experiment was carried out at the Teaching and Research Farm of the Department of Crop, Soil and Pest Management, Federal University of Technology, Akure, during the rainy season in 2019. Principal component analysis and cluster analysis were employed to study the diversity present in the okra genotypes. There was great diversity among the forty genotypes of okra studied with respect to qualitative traits. There were highly significant differences P < 0.01 for all the quantitative characters, which indicated the presence of a great amount of diversity in all the characters studied. Single-linkage cluster analysis shows that, at 100% level of similarity, all the genotypes were distinct from one another. Results of the principal component analysis showed that 76.30% of the total variability among the okra genotypes evaluated in this study was accounted for the first five principal components. This study suggests that there is great diversity among the genotypes studied, which could be used by breeders for okra improvement.
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