Rice varieties that can survive under submergence conditions respond to flooding either by enhanc... more Rice varieties that can survive under submergence conditions respond to flooding either by enhancing internode elongation or by quiescence of shoot elongation. Despite extensive efforts to identify key metabolites triggered by complete submergence of rice possessing SUBMERGENCE 1 (SUB1) locus, metabolic responses of internode elongation of deepwater rice governed by the SNORKEL 1 and 2 genes remain elusive. This study investigated specific metabolomic responses under partial submergence (PS) to deepwater- (C9285) and non-deepwater rice cultivars (Taichung 65 (T65)). In addition, we examined the response in a near-isogenic line (NIL-12) that has a C9285 genomic fragment on chromosome 12 introgressed into the genetic background of T65. Under short-term submergence (0–24 h), metabolite profiles of C9285, NIL-12, and T65 were compared to extract significantly changed metabolites in deepwater rice under PS conditions. Comprehensive metabolite and phytohormone profiling revealed increases...
In order to suppress the somatic excision of the Ds element and increase the independent transpos... more In order to suppress the somatic excision of the Ds element and increase the independent transposition events of the Ac/Ds transposon tagging system in rice, we employed promoters of two meiosis-specific genes of lily, LIM10 and LIM18. The LIM10 promoter directed GUS expression specifically in anthers, with the LIM18 promoter doing the same in the anthers and somatic tissue. Both promoters induced independent germinal transposition with the frequency of approximately 1%. The LIM10 promoter, lacking induction of somatic transposition, is considered to be useful for improving transposon-tagging efficiencies in rice.
ABSTRACT To avoid drowning under flooded conditions, deepwater rice responds to rising water leve... more ABSTRACT To avoid drowning under flooded conditions, deepwater rice responds to rising water level by rapid internode elongation. Quantitative trait locus (QTL) analysis, using a deepwater rice cultivar (Oryza sativa) and a wild rice species (O. rufipogon) with deepwater characteristics, revealed the presence of major QTLs (qTIL12, qNE112 and qLE112) in a common chromosomal region that regulates internode elongation. Genetic analysis revealed that a QTL inherited in a dominant manner, was located on the long arm of chromosome 12. A (n) under bar early (i) under bar sogenic (l) under bar ine (NIL), produced by backcross introduction of a chromosome fragment carrying this major QTL into non-deepwater rice, exhibited a dramatic internode elongation in response to water rise. This indicates that the difference between deepwater rice and non-deepwater rice is associated with the presence of the QTL, and that this sequence is sufficient to confer deepwater characteristics. Although deepwater rice and non-deepwater rice share a common machinery for internode elongation; non-deepwater rice cannot activate the machinery in response to flooding, unlike deepwater rice which harbors this major QTL.
Rice varieties that can survive under submergence conditions respond to flooding either by enhanc... more Rice varieties that can survive under submergence conditions respond to flooding either by enhancing internode elongation or by quiescence of shoot elongation. Despite extensive efforts to identify key metabolites triggered by complete submergence of rice possessing SUBMERGENCE 1 (SUB1) locus, metabolic responses of internode elongation of deepwater rice governed by the SNORKEL 1 and 2 genes remain elusive. This study investigated specific metabolomic responses under partial submergence (PS) to deepwater- (C9285) and non-deepwater rice cultivars (Taichung 65 (T65)). In addition, we examined the response in a near-isogenic line (NIL-12) that has a C9285 genomic fragment on chromosome 12 introgressed into the genetic background of T65. Under short-term submergence (0–24 h), metabolite profiles of C9285, NIL-12, and T65 were compared to extract significantly changed metabolites in deepwater rice under PS conditions. Comprehensive metabolite and phytohormone profiling revealed increases...
In order to suppress the somatic excision of the Ds element and increase the independent transpos... more In order to suppress the somatic excision of the Ds element and increase the independent transposition events of the Ac/Ds transposon tagging system in rice, we employed promoters of two meiosis-specific genes of lily, LIM10 and LIM18. The LIM10 promoter directed GUS expression specifically in anthers, with the LIM18 promoter doing the same in the anthers and somatic tissue. Both promoters induced independent germinal transposition with the frequency of approximately 1%. The LIM10 promoter, lacking induction of somatic transposition, is considered to be useful for improving transposon-tagging efficiencies in rice.
ABSTRACT To avoid drowning under flooded conditions, deepwater rice responds to rising water leve... more ABSTRACT To avoid drowning under flooded conditions, deepwater rice responds to rising water level by rapid internode elongation. Quantitative trait locus (QTL) analysis, using a deepwater rice cultivar (Oryza sativa) and a wild rice species (O. rufipogon) with deepwater characteristics, revealed the presence of major QTLs (qTIL12, qNE112 and qLE112) in a common chromosomal region that regulates internode elongation. Genetic analysis revealed that a QTL inherited in a dominant manner, was located on the long arm of chromosome 12. A (n) under bar early (i) under bar sogenic (l) under bar ine (NIL), produced by backcross introduction of a chromosome fragment carrying this major QTL into non-deepwater rice, exhibited a dramatic internode elongation in response to water rise. This indicates that the difference between deepwater rice and non-deepwater rice is associated with the presence of the QTL, and that this sequence is sufficient to confer deepwater characteristics. Although deepwater rice and non-deepwater rice share a common machinery for internode elongation; non-deepwater rice cannot activate the machinery in response to flooding, unlike deepwater rice which harbors this major QTL.
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Papers by Yoko Hattori