title: A maize glutaredoxin gene, abphyl2, regulates shoot meristem size and phyllotaxy.
abstract: Phyllotaxy describes the geometric arrangement of leaves and is important for plant productivity. Auxin is well known to regulate phyllotactic patterns via PIN1-dependent auxin polar transport, and studies of maize (Zea mays) aberrant phyllotaxy1 (abph1) mutants suggest the importance of auxin and cytokinin signaling for control of phyllotaxy. However, whether additional regulators control these patterns is poorly understood. Here, we report a new dominant maize mutant, Aberrant phyllotaxy2 (Abph2), in which the shoot meristems are enlarged and the phyllotactic pattern switches from alternate to decussate. Map-based cloning revealed that the Abph2 mutation was caused by transposition of a glutaredoxin gene, MALE STERILE CONVERTED ANTHER1 (MSCA1), which gained an altered expression pattern in Abph2 mutant embryos. msca1 loss-of-function mutants have reduced meristem size and revealed a novel function of glutaredoxins in meristem growth. In addition, MSCA1 interacts with a TGA transcription factor, FASCIATED EAR4, suggesting a novel regulatory module for regulating shoot meristem size.
authors.affiliation: Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724.
authors.forename: Fang
authors.initials: F
authors.lastname: Yang
authors.affiliation: Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724.
authors.forename: Huyen Thanh
authors.initials: HT
authors.lastname: Bui
authors.affiliation: Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724.
authors.forename: Michael
authors.initials: M
authors.lastname: Pautler
authors.affiliation: DuPont Pioneer, Agricultural Biotechnology, Experimental Station, Wilmington, Delaware 19803.
authors.forename: Victor
authors.initials: V
authors.lastname: Llaca
authors.affiliation: Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724.
authors.forename: Robyn
authors.initials: R
authors.lastname: Johnston
authors.affiliation: Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724.
authors.forename: Byeong-ha
authors.initials: BH
authors.lastname: Lee
authors.affiliation: Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724.
authors.forename: Allison
authors.initials: A
authors.lastname: Kolbe
authors.affiliation: DuPont Pioneer, Agricultural Biotechnology, Experimental Station, Wilmington, Delaware 19803.
authors.forename: Hajime
authors.initials: H
authors.lastname: Sakai
authors.affiliation: Cold Spring Harbor Laboratory, Cold Spring Harbor, New York 11724 jacksond@cshl.edu.
authors.forename: David
authors.initials: D
authors.lastname: Jackson
mesh_terms: D018506:Gene Expression Regulation, Plant / Q000235:genetics / Q000502:physiology; D018519:Meristem / Q000235:genetics / Q000378:metabolism*; D010940:Plant Proteins / Q000235:genetics / Q000378:metabolism*; D030821:Plants, Genetically Modified / Q000235:genetics / Q000254:growth & development / Q000378:metabolism; D003313:Zea mays / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*
chemical_list: D010940:Plant Proteins