Comparative genetic diversity and nutritional quality variation among some important Southern African sorghum accessions [Sorghum bicolor (L.) Moench]

Ng’uni, D. and et al, . (2012) Comparative genetic diversity and nutritional quality variation among some important Southern African sorghum accessions [Sorghum bicolor (L.) Moench]. Australian Journal of Crop Science, 6 (1). pp. 56-64.

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Determination of genetic diversity and nutritional value is useful for varietal improvement. Fourteen sorghum accessions, six from Malawi (MW), four each from Tanzania (TZ) and Zambia (ZMB) considered most common and widely grown varieties in those countries were assessed for genetic diversity based on ten SSR loci and grain-Fe, Zn, total protein and starch contents. Sorghum accessions exhibited significant variation for protein, total starch content and grain-Zn (p<0.001) and grain-Fe (p<0.05). Grain-Fe content ranged from 2.8 to 6.3 mg/100g and grain-Zn content ranged 2.3 - 5.5 mg/100g. Grain protein content ranged from 9.7 to 16.3%. TZ4031 from Tanzania was superior in grain-Zn content while MW734 from Malawi was high in grain-Fe and protein contents. Zambian accessions were significantly higher in total starch content. Similarly, Tanzanian accessions were significantly superior in grain-Zn content. Protein content was significantly positive correlated with grain-Zn (r = 0.42). Significant and highly positive correlation (r = 0.49) was revealed between grain-Fe and Zn content. Nei’s gene diversity revealed higher genetic variation within Malawian accessions than in other accessions used in the study. The lowest within accessions genetic diversity was exhibited by Tanzanian accessions. Cluster and principal coordinate analyses revealed similarity between Malawian and Tanzanian accessions. The results suggest presence of genetic diversity for grain-Fe, Zn, protein and starch contents for food purposes and as resource for varietal improvement. MW734, TZ4031 and TZ3966 were identified as a potential resource material for grain-Fe and Zn variety enrichment programme. However, further research is recommended for evaluation of the compositional stability of potential sorghum accessions across various environmental conditions.

Item Type: Article
Uncontrolled Keywords: rghum, accessions, micronutrients, Fe, Zn, protein, total starch.
Author Affiliation: 1Swedish University of Agricultural Sciences, Department of Plant Breeding and Biotechnology, P.O. Box 101, SE-230 53 Alnarp, Sweden 2Zambia Agriculture Research Institute, National Plant Genetic Resources Centre, Private Bag 7, Chilanga, Zambia 3Swedish Biodiversity Centre, P.O. Box 91, Pomonavägen 2, SE-230 53 Alnarp, Sweden
Subjects: Plant Production
Statistics and Experimentation > Experimentation
Crop Improvement
Divisions: Sorghum
Depositing User: Mr. SanatKumar Behera
Date Deposited: 11 Mar 2012 14:10
Last Modified: 11 Mar 2012 14:10
Official URL:

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