Heterosis for resistance to insect herbivores in a 3-line hybrid rice system

Horgan, Finbarr G.; Bernal, Carmencita C.; Fame Ramal, Angelee; Almazan, Maria Liberty P.; Mundaca-Ortega, Enrique; Crisol-Martínez, Eduardo

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dc.contributor.author	Horgan, Finbarr G.
dc.contributor.author	Bernal, Carmencita C.
dc.contributor.author	Fame Ramal, Angelee
dc.contributor.author	Almazan, Maria Liberty P.
dc.contributor.author	Mundaca-Ortega, Enrique
dc.contributor.author	Crisol-Martínez, Eduardo
dc.date.accessioned	2024-04-23T15:52:41Z
dc.date.available	2024-04-23T15:52:41Z
dc.date.issued	2024
dc.identifier.uri	http://repositorio.ucm.cl/handle/ucm/5348
dc.description.abstract	Three-line hybrid rice is produced by crossing male sterile (A line) rice with a fertility-restorer (R line). Fertile lines (B lines) are also required to maintain A line seed for breeding programs. We used a range of hybrids and their parental lines to assess the frequency and nature of heterosis for resistance to the whitebacked planthopper (Sogatella furcifera), brown planthopper (Nilaparvata lugens) and yellow stemborer (Scirpophaga incertulas). Heterosis is defined as trait improvement above the average of the parental lines as a result of outbreeding. Based on the results from a greenhouse study that challenged hybrids and their parental lines with each herbivore species, we found that susceptibility to planthoppers was associated with one of the eight A lines tested, but resistance was improved by crossing with a relatively resistant restorer. Higher frequencies of heterosis for susceptibility in comparisons between hybrids and their B lines suggest that susceptibility was not related to the cytoplasmic genomes of the associated sterile A lines. Furthermore, because none of the parental lines possessed currently effective resistance genes, improved resistance against planthoppers was probably due to quantitative resistance. In a related field trial, hybrids had generally higher yields than their fertile parents and often produced larger grain; however, they were often more susceptible to stemborers, leaffolders (Cnaphalocrocis medinalis) and other caterpillars (Rivula atimeta). This was largely a consequence of hybrid heterosis for plant biomass and was strongly affected by crop duration. We make a series of recommendations to improve hybrid breeding to reduce the risks of herbivore damage.	es_CL
dc.language.iso	en	es_CL
dc.rights	Atribución-NoComercial-SinDerivadas 3.0 Chile	*
dc.rights.uri	http://creativecommons.org/licenses/by-nc-nd/3.0/cl/	*
dc.source	Insects, 15(3), 164	es_CL
dc.subject	Brown planthopper	es_CL
dc.subject	Herbivory tolerance	es_CL
dc.subject	Heterosis	es_CL
dc.subject	Host plant resistance	es_CL
dc.subject	Leaffolders	es_CL
dc.subject	Plant physiology	es_CL
dc.subject	Rice herbivores	es_CL
dc.subject	Stemborers	es_CL
dc.subject	Whitebacked planthopper	es_CL
dc.subject	Yields	es_CL
dc.title	Heterosis for resistance to insect herbivores in a 3-line hybrid rice system	es_CL
dc.type	Article	es_CL
dc.ucm.facultad	Facultad de Ciencias Agrarias y Forestales	es_CL
dc.ucm.indexacion	Scopus	es_CL
dc.ucm.indexacion	Isi	es_CL
dc.ucm.uri	mdpi.com/2075-4450/15/3/164	es_CL
dc.ucm.doi	doi.org/10.3390/insects15030164	es_CL