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Screening and identification of resistance to bacterial soft rot in Brassica rapa

Authors
  • Ren, Jianping1, 2
  • Petzoldt, Rixana1
  • Dickson, Michael H.1
  • 1 PanAmerican Seed Co., 15861 Green Road, Elburn, IL, 60119, U.S.A. , Elburn
  • 2 Cornell University, Dept. of Plant Breeding, Ithaca, NY, 14853-1901, U.S.A. , Ithaca
Type
Published Article
Journal
Euphytica
Publisher
Kluwer Academic Publishers
Publication Date
Apr 01, 2001
Volume
118
Issue
3
Pages
271–280
Identifiers
DOI: 10.1023/A:1017522501229
Source
Springer Nature
Keywords
License
Yellow

Abstract

Mist-chamber, field, and detached leaf inoculation procedures identified plants resistant to bacterial soft rot [Erwinia carotovora subsp. carotovora, (Ecc)] in Brassica rapa and related species. The mist-chamber seedling inoculation provided the best correlation of mean disease severity ratings with the field plant inoculation (r = 0.67**) and was used to identify resistant materials. The optimum mist-chamber incubation conditions to distinguish the resistance of accessions were 23 °C and 100% RH and were used for primary screening. A total of 752 accessions of B. rapa and related Cruciferae were screened. In general, accessions of B. oleracea were more resistant than accessions of B. rapa. Within B. rapa, subspecies pekinensis and chinensis were more susceptible than other subspecies. No completely resistant material was found. In species of B. rapa, only 7% of accessions showed some degree of resistance with plant-to-plant variation within the accessions. G30444, G30449, and AVRDC2837 were identified as the most resistant materials in B. rapa by both mist-chamber and field inoculations. The resistance was correlated between an USA isolate (Geneva-1) and two Chinese isolates (RL4-1 and RL-19) of Ecc.

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