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Although hybridity and polyploidy can influence heterosis in hybrid plants, the differential contributions of hybridity vs polyploidy to heterosis effects remain unknown.<\/jats:p><\/jats:list-item>\n\n<jats:list-item><jats:p>To address this question, we investigated heterosis effects on rosette size and growth rate of 88 distinct F<jats:sub>1<\/jats:sub> lines of <jats:italic>Arabidopsis thaliana<\/jats:italic> consisting of diploids, reciprocal triploids and tetraploids in isogenic and hybrid genetic contexts.<\/jats:p><\/jats:list-item>\n\n<jats:list-item><jats:p> \u2018Heterosis without hybridity\u2019 effects on plant size can be generated in genetically isogenic F<jats:sub>1<\/jats:sub> triploid plants. Paternal genome excess F<jats:sub>1<\/jats:sub> triploids display positive heterosis, whereas maternal genome excess F<jats:sub>1<\/jats:sub>s display negative heterosis effects. Paternal genome dosage increases plant size in F<jats:sub>1<\/jats:sub> hybrid triploid plants by, on average, 57% (in contrast with 35% increase displayed by F<jats:sub>1<\/jats:sub> diploid hybrids). Such effects probably derive from differential seed size, as the growth rate of triploids was similar to diploids. Tetraploid plants display a lower growth rate compared with other ploidies, whereas hybrids display increased early stage growth rate.<\/jats:p><\/jats:list-item>\n\n<jats:list-item><jats:p>By disaggregating heterosis effects caused by hybridity vs genome dosage, we advance our understanding of heterosis in plants and facilitate novel paternal genome dosage\u2010based strategies to enhance heterosis effects in crop plants.<\/jats:p><\/jats:list-item>\n<\/jats:list>\n<\/jats:p>","DOI":"10.1111\/nph.13650","type":"journal-article","created":{"date-parts":[[2015,9,23]],"date-time":"2015-09-23T12:26:02Z","timestamp":1443011162000},"page":"590-599","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":57,"title":["Disaggregating polyploidy, parental genome dosage and hybridity contributions to heterosis in <i>Arabidopsis 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