Integrating gene deployment and crop management for improved rice resistance to Asian planthoppers

Horgan, FG

Integrating gene deployment and crop management for improved rice resistance to Asian planthoppers

Horgan, FG

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Publication Type:: Journal Article
Citation:: Crop Protection, 2018, 110 pp. 21 - 33
Issue Date:: 2018-08-01

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Field	Value	Language
dc.contributor.author	Horgan, FG https://orcid.org/0000-0003-3796-667X	en_US
dc.date.issued	2018-08-01	en_US
dc.identifier.citation	Crop Protection, 2018, 110 pp. 21 - 33	en_US
dc.identifier.issn	0261-2194	en_US
dc.identifier.uri	http://hdl.handle.net/10453/130609
dc.description.abstract	© 2018 Elsevier Ltd This review examines the effects of crop management on the efficiency and durability of planthopper resistant rice in Asia. Historical evidence and selection experiments indicate that the proportion of virulent individuals in planthopper populations is normally sufficiently high for populations to overcome major resistance genes within 12–15 generations. Pyramiding resistance may prolong durability, but will depend on avoiding concurrent deployment of monogenic and pyramided lines that share resistance genes, and on the capacity of planthoppers to maintain virulence to ≥2 genes. Combining major genes with quantitative resistance will increase durability. Planthopper population size is likely to be the main contributor to virulence adaptation during the early stages of varietal adoption. High fertilizer inputs increase the availability of soluble proteins, thereby increasing rice susceptibility to planthoppers. Resurgence insecticides can directly increase host plant susceptibility, increase planthopper fecundity, and/or deplete natural enemy abundance, leading to rapid increases in planthopper densities. Nevertheless, comparative experiments indicate that the relative fitness of planthoppers on resistant and susceptible varieties is often maintained across gradients of fertilizer and insecticide applications. However, densities of planthoppers will increase in response to high inputs thereby enhancing the potential for populations to overcome resistance. Avoiding excessive fertilizer applications and resurgence insecticides, rotating rice varieties, increasing rice genetic diversity in the landscape, and maintaining generalist natural enemies will slow planthopper population growth, enhance resistance and has the potential to prolong durability. Because insecticides reduce the profitability of using resistant varieties, host plant resistance must be accompanied by a concomitant decline in insecticide use if it is to achieve its goals as an efficient, economic and environmentally friendly pest management option.	en_US
dc.relation.ispartof	Crop Protection	en_US
dc.relation.isbasedon	10.1016/j.cropro.2018.03.013	en_US
dc.subject.classification	Entomology	en_US
dc.title	Integrating gene deployment and crop management for improved rice resistance to Asian planthoppers	en_US
dc.type	Journal Article
utslib.citation.volume	110	en_US
utslib.for	0703 Crop and Pasture Production	en_US
pubs.embargo.period	Not known	en_US
pubs.organisational-group	/University of Technology Sydney
pubs.organisational-group	/University of Technology Sydney/Faculty of Science
pubs.organisational-group	/University of Technology Sydney/Faculty of Science/School of Life Sciences
utslib.copyright.status	recently_added
pubs.publication-status	Published	en_US
pubs.volume	110	en_US

Abstract:

© 2018 Elsevier Ltd This review examines the effects of crop management on the efficiency and durability of planthopper resistant rice in Asia. Historical evidence and selection experiments indicate that the proportion of virulent individuals in planthopper populations is normally sufficiently high for populations to overcome major resistance genes within 12–15 generations. Pyramiding resistance may prolong durability, but will depend on avoiding concurrent deployment of monogenic and pyramided lines that share resistance genes, and on the capacity of planthoppers to maintain virulence to ≥2 genes. Combining major genes with quantitative resistance will increase durability. Planthopper population size is likely to be the main contributor to virulence adaptation during the early stages of varietal adoption. High fertilizer inputs increase the availability of soluble proteins, thereby increasing rice susceptibility to planthoppers. Resurgence insecticides can directly increase host plant susceptibility, increase planthopper fecundity, and/or deplete natural enemy abundance, leading to rapid increases in planthopper densities. Nevertheless, comparative experiments indicate that the relative fitness of planthoppers on resistant and susceptible varieties is often maintained across gradients of fertilizer and insecticide applications. However, densities of planthoppers will increase in response to high inputs thereby enhancing the potential for populations to overcome resistance. Avoiding excessive fertilizer applications and resurgence insecticides, rotating rice varieties, increasing rice genetic diversity in the landscape, and maintaining generalist natural enemies will slow planthopper population growth, enhance resistance and has the potential to prolong durability. Because insecticides reduce the profitability of using resistant varieties, host plant resistance must be accompanied by a concomitant decline in insecticide use if it is to achieve its goals as an efficient, economic and environmentally friendly pest management option.

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http://hdl.handle.net/10453/130609