Hierarchical additive effects on heterosis in rice (Oryza sativa L.)

Frontiers in Plant Science

Jun eHu¹  Wei eZhou¹  Guoxin eYao¹  Zhiwu eDan¹  Yingguo eZhu¹  Renshan eZhu¹  Wenchao eHuang¹ 

[1] Wuhan University;

关键词: heterosis;    multiplicative interactions;    Hybrids;    hierarchical structure;    Additive effects;    rice (Oryza sativa L.).;   

DOI  :  10.3389/fpls.2015.00738

来源: DOAJ

【 摘 要 】

Exploitation of heterosis in crops has contributed greatly to improvement in global food and energy production. In spite of the pervasive importance of heterosis, a complete understanding of its mechanisms has remained elusive. In this study, a small test-crossed rice population was constructed to investigate the formation mechanism of heterosis for thirteen traits. The results of the relative midparent heterosis and modes of inheritance of all investigated traits demonstrated that additive effects were the foundation of heterosis for complex traits in a hierarchical structure, and multiplicative interactions among the component traits were the framework of heterosis in complex traits. Furthermore, new balances between unit traits and related component traits provided hybrids with the opportunity to achieve an optimal degree of heterosis for complex traits. This study dissected heterosis of both reproductive and vegetative traits from the perspective of hierarchical structure for the first time. Additive multiplicative interactions of component traits were proven to be the origin of heterosis in complex traits. Meanwhile, more attention should be paid to component traits, rather than complex traits, in the process of revealing the mechanism of heterosis.

【 授权许可】

Unknown