Evolution of floral meristem identity genes.: Analysis of <i>Lolium temulentum</i> genes related to <i>APETALA1</i> and <i>LEAFY</i> of Arabidopsis

作     者：Gocal, GFW King, RW Blundell, CA Schwartz, OM Andersen, CH Weigel, D 

作者机构：Commonwealth Sci & Ind Res Org Div Plant Ind Canberra ACT 2601 Australia Salk Inst Biol Studies Plant Biol Lab La Jolla CA 92037 USA Australian Natl Univ Res Sch Biol Sci Canberra ACT 2601 Australia DLF Trifolium AS Riso Natl Lab DK-4000 Roskilde Denmark 

出 版 物：《PLANT PHYSIOLOGY》 (植物生理学)

年 卷 期：2001年第125卷第4期

页      面：1788-1801页

核心收录：

学科分类：0710[理学-生物学] 071001[理学-植物学] 07[理学] 

主　　题：Gene expression Plants Meristems Spikelets Rice Application programming interfaces RNA Bracts 

摘      要：Flowering (inflorescence formation) of the grass Lolium temulentum is strictly regulated, occurring rapidly on exposure to a single long day (LD). During floral induction, L. temulentum differs significantly from dicot species such as Arabidopsis in the expression, at the shoot apex, of two APETALA1 (AP1)-like genes, LtMADS1 and LtMADS2, and of L. temulentum LEAFY (LtLFY). As shown by in situ hybridization, LtMADS1 and LtMADS2 are expressed in the vegetative shoot apical meristem, but expression increases strongly within 30 h of LD floral induction. Later in floral development, LtMADS1 and LtMADS2 are expressed within spikelet and floret meristems and in the glume and lemma primordia. It is interesting that LtLFY is detected quite late (about 12 d after LD induction) within the spikelet meristems, glumes, and lemma primordia. These patterns contrast with Arabidopsis, where LFY and AP1 are consecutively activated early during flower formation. LtMADS2, when expressed in transgenic Arabidopsis plants under the control of the AP1 promoter, could partially complement the organ number defect of the severe ap1-15 mutant allele, confirming a close relationship between LtMADS2 and AP1.