Kimberly sugar beet germplasm evaluated for rhizomania and storage rot resistance in Idaho, 2019

Eujayl, Imad A. and Strausbaugh, C.A. (2020) Kimberly sugar beet germplasm evaluated for rhizomania and storage rot resistance in Idaho, 2019. Plant Disease Management Reports. 14. 25 August 2020.

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Abstract

Rhizomania caused by Beet necrotic yellow vein virus (BNYVV) and storage losses are serious sugar beet production problems. To identify sugar beet germplasm lines with resistance to BNYVV and storage rots, eight Beta vulgaris lines and five check cultivars were screened. The lines were grown in a sugar beet field infested with BNYVV during the 2019 growing season in a randomized complete block design with 6 replications. At harvest on 16 October 2019, roots were dug and evaluated for rhizomania symptoms and then placed in an indoor commercial sugar beet storage building. After 129 days in storage, samples were evaluated for the percentage of root surface area covered by fungal growth or rot. Rhizomania symptom development in the field was uniform and other disease problems were not evident in the plot area. The BNYVV susceptible sugar and red beet checks both had 100% foliar symptoms and a high root disease severity rating. The resistant check with two resistance genes, Rz1 + Rz2 (check 3), had no foliar symptoms and low root rating. The resistant checks with only one resistance gene had foliar symptoms ranging from 14 to 24%, but their root ratings were still within an acceptable range. Foliar symptoms indicate single gene resistance for BNYVV is becoming marginal. Based on foliar ratings, entry 6 (KEMS8) seemed healthy, but root ratings from this entry were significantly worse than the resistant checks. Entry 6 will be investigated further to make sure the root rating was an indication of susceptibility and not just poor root shape. These observations suggest that both foliar and root ratings should be utilized when considering resistance to BNYVV, since relying on just one type of rating may be misleading. Three entries (1, 2, and 6) had resistance to fungal rots in storage, but only entry 6 performed well for both storage and the foliar RZ rating. These three entries will serve as genetic sources for identifying additional resistance to BNYVV and storage rots.

Item Type:	Article
NWISRL Publication Number:	1679
Subjects:	Irrigated crops > Sugarbeet > Resistance Irrigated crops > Sugarbeet > Rhizomania Irrigated crops > Sugarbeet > Root rots Irrigated crops > Sugarbeet > Storage Irrigated crops > Sugarbeet
Depositing User:	Users 6 not found.
Date Deposited:	15 Jan 2021 18:35
Last Modified:	15 Jan 2021 18:35
Item ID:	1727
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/1727