Status, genetic diversity and gaps in sorghum germplasm from South Asia conserved at ICRISAT genebank
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Hari D. Upadhyaya, K. N. Reddy, Mani Vetriventhan, Murali Krishna Gumma, Mohammed Ahmed, M. Thimma Reddy, Shailesh Kumar Singh. (29/6/2016). Status, genetic diversity and gaps in sorghum germplasm from South Asia conserved at ICRISAT genebank. Plant Genetic Resources, /, pp. 1-12.
Abstract
The genebank at ICRISAT, India that serves as a world repository for sorghum germplasm conserves
39,234 accessions from 93 countries, including 6249 from seven South Asian countries: Afghanistan
(6), Bangladesh (9), India (6101), the Maldives (10), Nepal (8), Pakistan (90) and Sri Lanka (25). A
total of 5340 georeferenced accessions were used to identify gaps, and 5322 accessions that were
characterized at ICRISAT were used to assess the diversity in the collection. Accessions of basic races
varied widely than those of intermediate races for flowering in the postrainy season, plant height in
both rainy and postrainy seasons, panicle exsertion, panicle length and width, seed size and 100
seed weight. Landraces from India were late flowering, tall and produced stout panicles and larger
seeds. Landraces from Pakistan flowered early in both seasons and produced stout panicles and
those from Sri Lanka were late flowering and tall in both seasons, produced more basal tillers and
stout panicles. A total of 110 districts in 20 provinces of India, 13 districts in three provinces of
Pakistan, three districts in Bangladesh and five districts in four provinces of Sri Lanka were identified
as geographical gaps. Sorghum bicolor subsp. verticilliflorum, S. halepense and S. propinquum
were identified as taxonomic gaps in the collection. Therefore, it is suggested to explore the districts
identified as gaps to enrich the variability in the world collection of sorghum at ICRISAT
