TY - JOUR
T1 - Osarf11 promotes growth, meristem, seed, and vein formation during rice plant development
AU - Sims, Katherine
AU - Abedi-Samakush, Fatemeh
AU - Szulc, Nicole
AU - Honti, Monika Gyongyi Macias
AU - Mattsson, Jim
N1 - KAUST Repository Item: Exported on 2021-04-27
Acknowledgements: This research was funded by the Natural Sciences and Engineering Research Council (NSERC) discovery grant to J.M., MITACS Accelerate Fellowship to K.S., and MITACS Globalink fellowship to M.G.M.H.
PY - 2021/4/15
Y1 - 2021/4/15
N2 - The plant hormone auxin acts as a mediator providing positional instructions in a range of developmental processes. Studies in Arabidopsis thaliana L. show that auxin acts in large part via activation of Auxin Response Factors (ARFs) that in turn regulate the expression of downstream genes. The rice (Oryza sativa L.) gene OsARF11 is of interest because of its expression in developing rice organs and its high sequence similarity with MONOPTEROS/ARF5, a gene with prominent roles in A. thaliana development. We have assessed the phenotype of homozygous insertion mutants in the OsARF11 gene and found that in relation to wildtype, osarf11 seedlings produced fewer and shorter roots as well as shorter and less wide leaves. Leaves developed fewer veins and larger areoles. Mature osarf11 plants had a reduced root system, fewer branches per panicle, fewer grains per panicle and fewer filled seeds. Mutants had a reduced sensitivity to auxin-mediated callus formation and inhibition of root elongation, and phenylboronic acid (PBA)-mediated inhibition of vein formation. Taken together, our results implicate OsARF11 in auxin-mediated growth of multiple organs and leaf veins. OsARF11 also appears to play a central role in the formation of lateral root, panicle branch, and grain meristems.
AB - The plant hormone auxin acts as a mediator providing positional instructions in a range of developmental processes. Studies in Arabidopsis thaliana L. show that auxin acts in large part via activation of Auxin Response Factors (ARFs) that in turn regulate the expression of downstream genes. The rice (Oryza sativa L.) gene OsARF11 is of interest because of its expression in developing rice organs and its high sequence similarity with MONOPTEROS/ARF5, a gene with prominent roles in A. thaliana development. We have assessed the phenotype of homozygous insertion mutants in the OsARF11 gene and found that in relation to wildtype, osarf11 seedlings produced fewer and shorter roots as well as shorter and less wide leaves. Leaves developed fewer veins and larger areoles. Mature osarf11 plants had a reduced root system, fewer branches per panicle, fewer grains per panicle and fewer filled seeds. Mutants had a reduced sensitivity to auxin-mediated callus formation and inhibition of root elongation, and phenylboronic acid (PBA)-mediated inhibition of vein formation. Taken together, our results implicate OsARF11 in auxin-mediated growth of multiple organs and leaf veins. OsARF11 also appears to play a central role in the formation of lateral root, panicle branch, and grain meristems.
UR - http://hdl.handle.net/10754/668954
UR - https://www.mdpi.com/1422-0067/22/8/4089
UR - http://www.scopus.com/inward/record.url?scp=85104155293&partnerID=8YFLogxK
U2 - 10.3390/ijms22084089
DO - 10.3390/ijms22084089
M3 - Article
C2 - 33920962
SN - 1422-0067
VL - 22
SP - 4089
JO - International Journal of Molecular Sciences
JF - International Journal of Molecular Sciences
IS - 8
ER -