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 Plus annual

Presents the access of premium content as premium feature

Premium Content

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 annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Background  Root system architecture is an important trait affecting the uptake of nutrients and water by crops. Shallower root systems preferentially take up nutrients from the topsoil and help avoid unfavorable environments in deeper soil layers. We have found a soil-surface rooting mutant from an M 2  population that was regenerated from seed calli of a  japonica  rice cultivar, Nipponbare. In this study, we examined the genetic and physiological characteristics of this mutant.    Results  The primary roots of the mutant showed no gravitropic response from the seedling stage on, whereas the gravitropic response of the shoots was normal. Segregation analyses by using an F 2  population derived from a cross between the soil-surface rooting mutant and wild-type Nipponbare indicated that the trait was controlled by a single recessive gene, designated as  sor1 . Fine mapping by using an F 2  population derived from a cross between the mutant and an  indica  rice cultivar, Kasalath, revealed that  sor1  was located within a 136-kb region between the simple sequence repeat markers  RM16254  and  2935-6  on the terminal region of the short arm of chromosome 4, where 13 putative open reading frames (ORFs) were found. We sequenced these ORFs and detected a 33-bp deletion in one of them,  Os04g0101800 . Transgenic plants of the mutant transformed with the genomic fragment carrying the  Os04g0101800  sequence from Nipponbare showed normal gravitropic responses and no soil-surface rooting.    Conclusion  These results suggest that  sor1 , a rice mutant causing soil-surface rooting and altered root gravitropic response, is allelic to  Os04g0101800 , and that a 33-bp deletion in the coding region of this gene causes the mutant phenotypes.

Isolation of a novel mutant gene for soil-surface rooting in rice (Oryza sativa L.)