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Knox homologs shoot meristemless (STM) and KNAT6 are epistatic to CLAVATA3 (CLV3) during shoot meristem development in Arabidopsis thaliana
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Knox homologs shoot meristemless (STM) and KNAT6 are epistatic to CLAVATA3 (CLV3) during shoot meristem development in Arabidopsis thaliana
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Journal Article
Knox homologs shoot meristemless (STM) and KNAT6 are epistatic to CLAVATA3 (CLV3) during shoot meristem development in Arabidopsis thaliana
2021
Overview
Background
In
Arabidopsis
, the genes
SHOOT MERISTEMLESS
(
STM
) and
CLAVATA
3 (
CLV3
) antagonistically regulate shoot meristem development. STM is essential for both development and maintenance of the meristem, as
stm
mutants fail to develop a shoot meristem. CLV3, on the other hand, negatively regulates meristem proliferation, and
clv3
mutants possess an enlarged shoot meristem. Genetic interaction studies revealed that
stm
and
clv3
dominantly suppress each other’s phenotypes. STM works in conjunction with its closely related homologue KNOTTED1-LIKE HOMEOBOX GENE 6 (KNAT6) to promote meristem development and organ separation, as
stm
knat6
double mutants fail to form shoot meristem and produce a fused cotyledon.
Results
In this study, we show that
clv3
fails to promote shoot meristem formation in
stm-1
background if we also remove KNAT6.
stm-1
knat6 clv3
triple mutants result in shoot meristem termination and produce fused cotyledons similar to
stm
knat6
double mutant. Notably, the
stm-1 knat6
and
stm-1 knat6 clv3
alleles lack tissue in the presumed region of SAM that is a novel phenotype reported in
Arabidopsis
mutants.
stm-1
knat6 clv3
also showed reduced inflorescence size as compared to
clv3
single or
stm
clv3
double mutants.
Conclusion
In contrast to previously published data, these data suggest that STM and KNAT6 are redundantly required for the vegetative SAM, but insufficient for the inflorescence meristem.
Publisher
Springer Netherlands,Springer Nature B.V
Subject
/ Arabidopsis - growth & development
/ Arabidopsis Proteins - genetics
/ Biomedical and Life Sciences
/ Gene Expression Regulation, Developmental
/ Gene Expression Regulation, Plant
/ Homeobox
/ Homeodomain Proteins - genetics
/ Meristem - growth & development
/ Mutants
/ Mutation
/ Plants, Genetically Modified
/ Proteins
