English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Tools annual

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

Background  Asian cultivated rice ( Oryza sativa  L.) comprises two subspecies,  O. sativa  subsp.  indica  and subsp.  japonica , and the hybrids between them display strong heterosis. However, hybrid sterility (HS) limits practical use of the heterosis between these two subspecies.  S5  is a major-effect locus controlling the HS of female gametes in rice, consisting of three closely-linked genes  ORF3 ,  ORF4  and  ORF5  that act as a killer-protector system. The HS effects of  S5  are inconsistent for different genetic backgrounds, indicating the existence of interacting genes within the genome.    Results  In the present study, the  S5 -interacting genes (SIG) and their effects on HS were analyzed by studying the hybrid progeny between an  indica  rice, Dular (DL) and a  japonica  rice, Balilla  ORF5 +  (BL  ORF5 + ), with a transgenic  ORF5+  allele. Four interacting quantitative trait loci (QTL):  qSIG3.1 ,  qSIG3.2 ,  qSIG6.1 , and  qSIG12.1 , were genetically mapped. To analyze the effect of each interacting locus, four near-isogenic lines (NILs) were developed. The effect of each specific locus was investigated while the other three loci were kept DL homozygous (DL/DL). Of the four loci,  qSIG3.1  was the SIG with the greatest effects in which the DL allele was completely dominant. Furthermore, the DL allele displayed incomplete dominance at  qSIG3.2 ,  qSIG6.1 , and  qSIG12.1 .  qSIG3.1  will be the first choice for further fine-mapping.    Conclusions  Four  S5 -interacting QTL were identified by genetic mapping and the effect of each locus was analyzed using advanced backcrossed NILs. The present study will facilitate elucidation of the molecular mechanism of rice HS caused by  S5 . Additionally, it would provide the basis to explore the origin and differentiation of cultivated rice, having practical significance for inter-subspecific hybrid rice breeding programs.    Supplementary Information  The online version contains supplementary material available at 10.1186/s12284-020-00452-x.

Genetic Analysis of S5-Interacting Genes Regulating Hybrid Sterility in Rice