Correct measurement of environmental parameters is fundamental for plant fitness and survival,as well as for timing developmental transitions,including the switch from vegetative to reproductive growth.Important param...Correct measurement of environmental parameters is fundamental for plant fitness and survival,as well as for timing developmental transitions,including the switch from vegetative to reproductive growth.Important parameters that affect flowering time include day length(photoperiod)and temperature.Their response pathways have been best described in Arabidopsis,which currently offers a detailed conceptual framework and serves as a comparison for other species.Rice,the focus of this review,also possesses a photoperiodic flowering pathway,but 150 million years of divergent evolution in very different environments have diversified its molecular architecture.The ambient temperature perception pathway is strongly intertwined with the photoperiod pathway and essentially converges on the same genes to modify flowering time.When observing network topologies,it is evident that the rice flowering network is centered on EARLY HEADING DATE 1,a rice-specific transcriptional regulator.Here,we summarize the most important features of the rice photoperiodic flowering network,with an emphasis on its uniqueness,and discuss its connections with hormonal,temperature perception,and stress pathways.展开更多
Strigolactones （SLs） are a class of plant hormones that control plant development in response to environmental conditions. In rice, mesocotyl elongation is regulated by SLs in the dark, while mesocotyls are longer i...Strigolactones （SLs） are a class of plant hormones that control plant development in response to environmental conditions. In rice, mesocotyl elongation is regulated by SLs in the dark, while mesocotyls are longer in SL deficient or insensitive mutants. SLs are perceived by DWARF14 （D14）, which is a member of a small gene family. In this study, we examined the function of another D14 family gene in rice, D14 LIKE （D14L）, focusing on mesocotyl growth. The mesocotyls of D14L RNAi lines are longer than those of WT in the dark. This phenotype is enhanced when the D14L RNAi lines are combined with the d14 mutation, suggesting that D14 and D14L work independently to inhibit mesocotyl elongation. This phenotype is alleviated by the exogenous supply of GR24, a synthetic SL, suggesting that D14L is not necessary for SL signaling. D14L mRNA is predominantly expressed in vascular bundles and crown root primordia. Our results suggest that D14L and D14 confer their effects via an SL independent pathway and an SL signaling pathway respectively.展开更多
基金supported by funding from the Italian Ministry of Foreign Affairs and International Cooperation,Italy-Japan bilateral collaboration on Agrifood#PGR10097.
文摘Correct measurement of environmental parameters is fundamental for plant fitness and survival,as well as for timing developmental transitions,including the switch from vegetative to reproductive growth.Important parameters that affect flowering time include day length(photoperiod)and temperature.Their response pathways have been best described in Arabidopsis,which currently offers a detailed conceptual framework and serves as a comparison for other species.Rice,the focus of this review,also possesses a photoperiodic flowering pathway,but 150 million years of divergent evolution in very different environments have diversified its molecular architecture.The ambient temperature perception pathway is strongly intertwined with the photoperiod pathway and essentially converges on the same genes to modify flowering time.When observing network topologies,it is evident that the rice flowering network is centered on EARLY HEADING DATE 1,a rice-specific transcriptional regulator.Here,we summarize the most important features of the rice photoperiodic flowering network,with an emphasis on its uniqueness,and discuss its connections with hormonal,temperature perception,and stress pathways.
基金supported by a grant from the Promotion of Basic Research Activities for Innovative Biosciences (PROBRAIN) of Japan to J.K
文摘Strigolactones （SLs） are a class of plant hormones that control plant development in response to environmental conditions. In rice, mesocotyl elongation is regulated by SLs in the dark, while mesocotyls are longer in SL deficient or insensitive mutants. SLs are perceived by DWARF14 （D14）, which is a member of a small gene family. In this study, we examined the function of another D14 family gene in rice, D14 LIKE （D14L）, focusing on mesocotyl growth. The mesocotyls of D14L RNAi lines are longer than those of WT in the dark. This phenotype is enhanced when the D14L RNAi lines are combined with the d14 mutation, suggesting that D14 and D14L work independently to inhibit mesocotyl elongation. This phenotype is alleviated by the exogenous supply of GR24, a synthetic SL, suggesting that D14L is not necessary for SL signaling. D14L mRNA is predominantly expressed in vascular bundles and crown root primordia. Our results suggest that D14L and D14 confer their effects via an SL independent pathway and an SL signaling pathway respectively.
