Castillo-Bravo Rosa, Fort Antoine, Cashell Ronan, Brychkova Galina, McKeown Peter C, Spillane Charles
Genetics and Biotechnology Lab, Plant and AgriBiosciences Research Centre, Ryan Institute, National University of Ireland Galway, Galway, Ireland.
Front Plant Sci. 2022 Mar 7;13:835219. doi: 10.3389/fpls.2022.835219. eCollection 2022.
Parent-of-origin effects arise when a phenotype depends on whether it is inherited maternally or paternally. Parent-of-origin effects can exert a strong influence on F1 seed size in flowering plants, an important agronomic and life-history trait that can contribute to biomass heterosis. Here we investigate the natural variation in the relative contributions of the maternal and paternal genomes to F1 seed size across 71 reciprocal pairs of F1 hybrid diploids and the parental effect on F1 seed size heterosis. We demonstrate that the paternally derived genome influences F1 seed size more significantly than previously appreciated. We further demonstrate (by disruption of parental genome dosage balance in F1 triploid seeds) that hybridity acts as an enhancer of genome dosage effects on F1 seed size, beyond that observed from hybridity or genome dosage effects on their own. Our findings indicate that interactions between genetic hybridity and parental genome dosage can enhance heterosis effects in plants, opening new avenues for boosting heterosis breeding in crop plants.
当表型取决于其是母系遗传还是父系遗传时，就会出现亲本来源效应。亲本来源效应可对开花植物的F1种子大小产生强烈影响，F1种子大小是一个重要的农艺和生活史性状，可导致生物量杂种优势。在这里，我们研究了71对F1杂交二倍体及其亲本对F1种子大小杂种优势的亲本效应中，母本和父本基因组对F1种子大小相对贡献的自然变异。我们证明，父本来源的基因组对F1种子大小的影响比之前认为的更为显著。我们进一步证明（通过破坏F1三倍体种子中的亲本基因组剂量平衡），杂种性作为基因组剂量对F1种子大小效应的增强剂，其作用超出了单独观察到的杂种性或基因组剂量效应。我们的研究结果表明，遗传杂种性与亲本基因组剂量之间的相互作用可以增强植物中的杂种优势效应，为提高作物杂种优势育种开辟了新途径。
