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

dc.creatorHorgan, Finbarr G.
dc.creatorBernal, Carmencita C.
dc.creatorFame Ramal, Angelee
dc.creatorAlmazan, Maria Liberty P.
dc.creatorMundaca-Ortega, Enrique
dc.creatorCrisol-Martínez, Eduardo
dc.date2024-04-23T15:52:41Z
dc.date2024-04-23T15:52:41Z
dc.date2024
dc.date.accessioned2024-05-02T20:32:30Z
dc.date.available2024-05-02T20:32:30Z
dc.identifierhttp://repositorio.ucm.cl/handle/ucm/5348
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/9275531
dc.descriptionThree-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.
dc.languageen
dc.rightsAtribución-NoComercial-SinDerivadas 3.0 Chile
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/3.0/cl/
dc.sourceInsects, 15(3), 164
dc.subjectBrown planthopper
dc.subjectHerbivory tolerance
dc.subjectHeterosis
dc.subjectHost plant resistance
dc.subjectLeaffolders
dc.subjectPlant physiology
dc.subjectRice herbivores
dc.subjectStemborers
dc.subjectWhitebacked planthopper
dc.subjectYields
dc.titleHeterosis for resistance to insect herbivores in a 3-line hybrid rice system
dc.typeArticle


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