Screening O-type lines of sugar beet in terms of resistance to rhizoctonia root rot

Document Type : Scientific - Research

Authors

Assistant professor of Sugar Beet Research Department, Hamedan Agricultural and Natural Resources Research and Education Center (AREEO), Hamedan, Iran.

Abstract

In order to distinguish O-type lines of sugar beet  resistant to rhizoctonia root rot, 51 Otype lines along with resistant and susceptible controls were evaluated in the microplots at Ekbatan Station in Hamedan in 2021. To inoculate the seedlings to rhizoctonia, isolate Rh133 from rhizoctonia solani-AG2-2 fungus were propagated on corn seeds and placed next to root of 63-day-old plants. At the end of the season, roots were harvested and scored based on a scale of 1 to 9; thereafter, the disease index as well as harvest index were estimated. Results showed that Otypes 9 (FCOT 990084) and 19 (FCOT 990094) had the lowest disease index of 3.55 and 3.76, respectively, , and consequently the highest harvest index of 49.82 and 49.32%, respectively. Based on the results of cluster analysis, 48 sugar beet genotypes were divided into five groups under microplate condition. There was a significant difference among groups in terms of plant number, root number, disease index, and harvest index. Otypes 4 (FCOT 990079), 9 (FCOT 990084), 19 (FCOT 990094), 30 (FCOT 990105), and 47 (FCOT 990122) together with resistant control, cultivar 52 were placed in cluster 5 which had the highest harvest index and the lowest disease index. Grouping of Otype genotypes based on SIIG index showed that genotypes 19 (FCOT 990094), 9 (FCOT 990084), 30 (FCOT 990105), 4(FCOT 990079), and 47 (FCOT 990122) with values of 0.854, 0.824, 0.741, 0.708, and 0.701 were the closest genotypes to the ideal genotypes in terms of resistance to rhizoctonia.

Keywords

References

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Journal of Sugar Beet
Volume 37, Issue 2
September 2022
Pages 153-165

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