Genetic analysis of a hybrid sterility gene that causes both pollen and embryo sac sterility in hybrids between Oryza sativa L. and Oryza longistaminata.

ABSTRACT: Oryza longistaminata originates from African wild rice and contains valuable traits conferring tolerance to biotic and abiotic stress. However, interspecific crosses between O. longistaminata and Oryza sativa cultivars are hindered by reproductive barriers. To dissect the mechanism of interspecific hybrid sterility, we developed a near-isogenic line (NIL) using indica variety RD23 as the recipient parent and O. longistaminata as the donor parent. Both pollen and embryo sac semi-sterility were observed in F₁ hybrids between RD23 and NIL. Cytological analysis demonstrated that pollen abortion in F₁ hybrids occurred at the early bi-nucleate stage due to a failure of the first mitosis in microspores. Partial embryo sacs in the F₁ hybrids were defective during t

SUBMITTER: Chen H 

PROVIDER: S-EPMC5555098 | biostudies-literature | 2017 Sep

REPOSITORIES: biostudies-literature