Preprint Article Version 1 This version is not peer-reviewed

Induced Resistance to Striga hermonthica in Sorghum by Gamma Irradiation

Version 1 : Received: 29 July 2020 / Approved: 31 July 2020 / Online: 31 July 2020 (03:25:12 CEST)

How to cite: Nikiema, M.P.; Yonli, D.; Rabefiraisana, H.J.; Ali, A.; Ouédraogo, N.; Traoré, H.; Yanogo, H.Y.A.; Dao, K.; Sawadogo, M.; Jankuloski, L.; Ivan, I.; Abdelbagi, M.A.G. Induced Resistance to Striga hermonthica in Sorghum by Gamma Irradiation. Preprints 2020, 2020070727 (doi: 10.20944/preprints202007.0727.v1). Nikiema, M.P.; Yonli, D.; Rabefiraisana, H.J.; Ali, A.; Ouédraogo, N.; Traoré, H.; Yanogo, H.Y.A.; Dao, K.; Sawadogo, M.; Jankuloski, L.; Ivan, I.; Abdelbagi, M.A.G. Induced Resistance to Striga hermonthica in Sorghum by Gamma Irradiation. Preprints 2020, 2020070727 (doi: 10.20944/preprints202007.0727.v1).

Abstract

Striga species affect the potential productivity of cereals in sub-saharian Africa due to the lack of durable Striga-resistance in host crops. This study aimed at inducing new source of resistance in sorghum using gamma irradiation. Dry seeds of three Sorghum varieties; Grinkan, ICV1049 and Sariaso14 were gamma-irradiated with 200 Gy, 300 Gy, 400 Gy and 500 Gy. Screening strategies involved a 2-year field and greenhouse experiments, where mutant Sorghum families, their parents and resistant control were artificially infected with Striga hermonthica seeds. Field screenings revealedinduced genetic variability among them, forty families significantly reduced the number of emerged Striga plants or showed good Sorghum grain yield performance despite the infection by S. hermonthica ecotype from Burkina Faso. The induced putative resistant mutants were identified across the the four applied irradiation doses. Greenhouse experiment confirmed Striga resistance in seven mutant Sorghum families leading to no emergence of Burkina’s S. hermonthica ecotype along with high resistance index (RI) and low Striga damage score. Among them, two mutants SA38M5 and IC47M5 withstood S. hermonthica ecotype from Sudan and S. asiatica ecotype from Madagascar. The induced mutants will be evaluated for release to farmers for commercial production. Further studies are ongoing on confirmed mutants to highlight their Striga resistance mechanisms and explore the potential of pyramiding different mechanism to produce durable resistance to S. hermonthica in sorghum.

Subject Areas

Sorghum; induced mutation; Striga resistance

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