PJB-2018-1596
The communication of endogenous biomolecules (RNA, DNA, protein, hormone) via graft union might play key roles in the new traits formation of graft hybrids
Han Zhao, Song-Feng Diao, Pan-Feng Liu, Ying Luo, Ta-Na Wuyun and Gao-Pu Zhu
Abstract
Plant graft hybridization is a fact ofasexual hybridization in which heritable changes trigger by grafting, it can produce hereditable variation types desired by breeders and can be used as a new method for germplasm innovation. This paper aimed to discuss new phenotypic variations such as phenotypic diversity and polyploidy formation discovered in recent years, new evidence supporting genetic material exchange between the rootstock and scion, and the timeliness, direction, and genetic stability of trait formation induced by graft hybridization. The unresolved mechanisms of trait variation were also discussed, and the relationship with exchange of chloroplast DNA (cpDNA) genetic information, horizontal gene transfer events of chloroplast and mitochondria, miRNA-mediated post-transcriptional regulation, and pressure-driven trait variations from graft hybridization were performed to clarify the relevant questions. Finally, the future research trend and key questions of graft hybridization were identified. Three clear conclusions for graft hybridization are presented: the new traits of graft hybrids have stable genetic characteristics and can be controlled via selection different genetic plant by grafting, and the products of graft hybrids were safer than those of transgenic plants
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