Gene Details:

• MSU gene ID: LOC_Os03g21540
• RAPdb gene ID: Os03g0333200
• Gene Symbol: DRUS1 FLR1
• Genome: MSU7 ,  IRGSP-1.0
• Species: Oryza sativa

Functional Descriptions:

• A phenotypic comparison of mutants expressing different amounts of DRUS1 and 2 revealed that reproductive growth requires a threshold level of DRUS1/2 proteins.
• DRUS1 and 2 maintain cell viability by repressing protease-mediated cell degradation and likely by affecting sugar utilization or conversion.
• We observed that both FLR1 and FLR2 were involved in tillering of rice, but at different levels.
• Interestingly, FLR1 and FLR2 showed different functions related to fertility, and FLR1 might be specifically involved in rice male gametophyte development.
• In this study, we generated FLR1 and flr2 T-DNA insertion null mutants and investigated potential role of FLRs in rice yield.
• With these similar but different functions, we suggest that FLR1 and FLR2 might function in complementary ways to regulate the yield of rice.
• To elucidate the possible mechanism underlying this phenomenon, we found that FLR1 was constitutively expressed during endosperm development.
• FLR1 mutants had a higher cell number and an accelerated rate of grain filling compared to wild-type plants, which led to grains with greater widths.
• A mechanism underlying the regulation of grain size by FLR1 is that FLR1 is associated with OsRac1 Rho-like GTPase, a positive regulator of grain size.
• Regarding grain quality, the FLR1 mutant had a higher percentage of chalkiness compared with wild-type plants, and seeds carrying mutations in flr3 and FLR14 had endosperms with white floury cores.
• RNA-seq analysis identified 2,367 genes that were differentially expressed in the FLR1 mutant, including genes involved in starch and sucrose metabolism and carbon fixation.
• In the present study, we found that FERONIA-like receptor 1 (FLR1) positively regulates Magnaporthe oryzae resistance and that expression of FLR1 is strongly induced in response to Ca(2+) deficiency.
• Moreover, RNA sequencing revealed 2,697 differentially expressed genes (DEGs) in the FLR1 mutant compared with wild-type, and some of these DEGs are involved in cellular metal ion homeostasis and transition metal ion homeostasis.
• Changes in expression of overlapping genes between the FLR1 mutant and in plants under low-Ca(2+) treatment were consistent in terms of direction, indicating that FLR1 is involved in Ca(2+) homeostasis.

Function-related keywords:

• growth ,  reproductive ,  sugar ,  reproductive-growth ,  tillering ,  development ,  yield ,  grain ,  starch ,  grain-size ,  endosperm ,  grain-filling ,  chalkiness ,  endosperm-development ,  sucrose ,  grain-quality ,  resistance ,  magnaporthe-oryzae ,  homeostasis

Literature:

• The Rice Receptor-Like Kinases DWARF AND RUNTISH SPIKELET1 and 2 Repress Cell Death and Affect Sugar Utilization during Reproductive Development .  DOI:  10.1105/tpc.16.00218 ;  PMID:  28082384
• Two FERONIA-like receptor FLR genes are required to maintain architecture, fertility, and seed yield in rice .  DOI:  10.1007/s11032-016-0580-x
• Roles of FERONIA-like receptor genes in regulating grain size and quality in rice .  DOI:  10.1007/s11427-020-1780-x ;  PMID:  32840735
• FERONIA-like receptor 1-mediated calcium ion homeostasis is involved in the immune response .  DOI:  10.3389/fpls.2022.934195 ;  PMID:  36212313

Related News:

Gene Resources:

• NCBI ID:
• UniProt accessions:

Sequences: