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OsMAINTENANCE OF MERISTEM LIKE 1 controls style number at high temperatures in rice
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Journal Article
OsMAINTENANCE OF MERISTEM LIKE 1 controls style number at high temperatures in rice
2025
Overview
OsMAIL1
encodes for a rice protein of the Plant Mobile Domain (PMD) family and is strongly upregulated during floral induction in response to the presence of the florigens Heading date 3a (Hd3a) and RICE FLOWERING LOCUS T1 (RFT1). Although
OsMAIL1
expression depends on the florigens,
osmail1
null mutants do not show delay in flowering time, rather OsMAIL1 participates in ensuring successful reproduction. Indeed, when day temperatures reach 35 °C (7 °C higher than standard greenhouse conditions),
osmail1
mutants show increased sterility due to abnormal pistil development with about half of the plants developing three styles topped by stigmas.
OsMAIL1
expression correlates with that of carpel identity genes and RNA-seq of
osmail1-1
mutant compared to the
wt
during inflorescence development showed that OsMAIL1 is required to activate carpel identity genes expression when floral meristems are about to be initiated.
OsMAIL1
is a newly characterized rice gene that specifically controls carpel development under heat stress, ensuring plant female fertility in these conditions.
Key message
OsMAIL1 is a Plant Mobile Domain protein that controls correct pistil development by preventing misexpression of floral homeotic genes when day temperatures reach 35°C during floral transition. In such conditions, osmail1 mutants develop abnormal three-styled pistils that can’t be usually fertilized.
Publisher
Springer Netherlands,Springer,Springer Nature B.V
Subject
/ Biomedical and Life Sciences
/ domain
/ family
/ florigen
/ Flowers - growth & development
/ Gene Expression Regulation, Plant
/ Genes
/ Heat
/ loci
/ Meristem - growth & development
/ Mutants
/ Mutation
/ Oryza - growth & development
/ pistil
/ Pistils
/ Plant reproductive structures
/ Proteins
/ Rice
/ RNA
/ Seeds
