Abstract
The online version contains supplementary material available at 10.1007/s11032-021-01256-7.
Highlights
Rice is the most important staple food crop that feeds more than half of the world’s population, and the breeding of high-yielding rice varieties is very important to meet the requirements of an increasing world population
In 2018, the isonuclear alloplasmic japonica lines were used as females in separate crosses with NILRf5, NILRf6, and PPLRf5+Rf6, resulting in a testcross population consisting of nine pairs of F1 hybrids for evaluating the fertility restoring ability of these two Rf genes in japonica rice lines
It is obvious that the effect of HL-type cytoplasmic male sterility (CMS) on pollen fate differs in the indica and japonica genetic backgrounds, which is consistent with our previous findings (Zhang et al 2016)
Summary
Rice is the most important staple food crop that feeds more than half of the world’s population, and the breeding of high-yielding rice varieties is very important to meet the requirements of an increasing world population. Rice yield has increased significantly with the introduction of semi-dwarf varieties and the exploitation of heterosis, and hybrid rice technology is considered to be a major strategy for increasing the yield potential of rice (Cheng et al 2007). Three-line and two-line systems are the main strategies for development of hybrid rice. The three-line hybrid breeding system is composed of a cytoplasmic male sterile (CMS) line, a maintainer line and a restorer line (Fujimura et al 1996; Yuan 1994).
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