Leuconostoc spp. associated with root rot in sugar beet and their interaction with rhizoctonia solani

Strausbaugh, C.A. (2016) Leuconostoc spp. associated with root rot in sugar beet and their interaction with rhizoctonia solani. Phytopathology. 106:432-441. 29 April 2016.

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Abstract

Rhizoctonia root and crown is an important disease problem in sugar beet caused by Rhizoctonia solani and also shown to be associated with Leuconostoc. Since, the initial Leuconostoc studies were conducted with only a few isolates and the relationship of Leuconostoc with R. solani is poorly understood, a more thorough investigation was conducted. A total of 203 Leuconostoc isolates were collected from recently harvested sugar beet roots in southern Idaho and southeastern Oregon during 2010 and 2012: 88 and 85% L. mesenteroides, 6 and 15% L. pseudomesenteroides, 2 and 0% L. kimchi, and 4 and 0% unrecognized Leuconostoc sp., respectively. Based on 16S rRNA sequencing, haplotype 11 (L. mesenteroides isolates) comprised 68 to 70% of the isolates both years. In pathogenicity field studies with commercial sugar beet cultivar B-7, all Leuconostoc isolates had more rot (P <0.0001; alpha = 0.05) when combined with R. solani than when inoculated alone both years. Also, 46 of the 52 combination treatments over the two years, had significantly more rot (P <0.0001; alpha = 0.05) than the fungal check. Therefore, the data support that a synergistic interaction leads to more rot when both Leconostoc and R. solani are present in sugar beet roots.

Item Type:	Article
NWISRL Publication Number:	1577
Subjects:	Irrigated crops > Sugarbeet > Rhizomania Irrigated crops > Sugarbeet > Root rots Irrigated crops > Sugarbeet
Depositing User:	Dan Stieneke
Date Deposited:	03 May 2016 15:42
Last Modified:	03 May 2016 15:42
Item ID:	1620
URI:	https://eprints.nwisrl.ars.usda.gov/id/eprint/1620