A trehalose metabolic enzyme controls inflorescence architecture in maize

被引:357
作者
Satoh-Nagasawa, N
Nagasawa, N
Malcomber, S
Sakai, H
Jackson, D
机构
[1] Cold Spring Harbor Lab, Cold Spring Harbor, NY 11724 USA
[2] DuPont Crop Genet Expt Stn E353, Wilmington, DE 19880 USA
[3] Univ Missouri, Dept Biol, St Louis, MO 63121 USA
基金
美国国家科学基金会;
关键词
D O I
10.1038/nature04725
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Inflorescence branching is a major yield trait in crop plants controlled by the developmental fate of axillary shoot meristems(1). Variations in branching patterns lead to diversity in flower-bearing architectures ( inflorescences) and affect crop yield by influencing seed number or harvesting ability(2,3). Several growth regulators such as auxins, cytokinins and carotenoid derivatives regulate branching architectures(4). Inflorescence branching in maize is regulated by three RAMOSA genes(5). Here we show that one of these genes, RAMOSA3 (RA3), encodes a trehalose-6-phosphate phosphatase expressed in discrete domains subtending axillary inflorescence meristems. Genetic and molecular data indicate that RA3 functions through the predicted transcriptional regulator RAMOSA1 (RA1)(5). We propose that RA3 regulates inflorescence branching by modification of a sugar signal that moves into axillary meristems. Alternatively, the fact that RA3 acts upstream of RA1 supports a hypothesis that RA3 itself may have a transcriptional regulatory function.
引用
收藏
页码:227 / 230
页数:4
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