Abstract
AbstractBrassica rapa line K185 was identified with broad-spectrum extreme resistance to turnip mosaic virus (TuMV). The resistance was effective against TuMV isolates UK 1, CZE 1, GBR 6, POL 1 and CDN 1 (representing major pathotypes 1, 3 and 4 and major resistance-breaking isolates) following mechanical inoculation. F1 plants from a cross between K185 and the rapid-cycling B. rapa ssp. trilocularis line R-o-18 (uniformly susceptible to all the above TuMV isolates), were resistant following challenge with TuMV isolates CDN 1 and GBR 6, indicating the involvement of dominant gene(s). F2 plants derived from a single F1, CDN 1- and GBR 6-resistant plant segregated for resistance to TuMV isolate GBR 6. The segregation ratio of resistant to susceptible plants was consistent with at least two loci controlling resistance and with both loci having dominant alleles for resistance. Other sources of broad-spectrum resistance to TuMV have been shown to involve the recessive allele retr01. The broad-spectrum resistance in K185 clearly involves different alleles to retr01 and provides the opportunity to introgress an alternative form of TuMV resistance into commercial B. rapa lines and thereby reduce the selection pressure for retr01 resistance breaking.
Publisher
Springer Science and Business Media LLC
Subject
Horticulture,Plant Science,Agronomy and Crop Science
Reference27 articles.
1. Bass, C., Puinean, A. M., Zimmer, C. T., Denholm, I., Field, L. M., Foster, S. P., et al. (2014). The evolution of insecticide resistance in the peach potato aphid, Myzus persicae. Insect Biochemistry and Molecular Biology, 51, 41–51.
2. Cao, J. S., Yu, X. L., Ye, W. Z., Lu, G., & Xiang, X. (2006). Functional analysis of a novel male fertility CYP86MF gene in Chinese cabbage (Brassica campestris L. ssp. chinensis makino). The Plant Cell, 24, 715–723.
3. Fahey, J.W. (2016). Brassica: characteristics and properties. Encyclopedia of Food and Health, pp.469–477.
4. Food and Agriculture Organization of the United Nations (FAO). FAOSTAT Database. Production quantity of “Cabbages and Other Brassicas”. 2019. Available online: http://www.fao.org/faostat/en/#data/QC (accessed on 7 March 2021).
5. Green, S. K., & Deng, T. C. (1985). Turnip mosaic virus strains in cruciferous hosts in Taiwan. Plant Disease, 69, 28–31.