UNIFOLIATA regulates leaf and flower morphogenesis in pea

生物 分生组织 多叶的 金鱼草 突变体 遗传学 拟南芥 基因 金鱼草 形态发生 基因座(遗传学) 表型 植物
作者
Julie Hofer,L. Turner,Roger P. Hellens,M. Ambrose,P. Matthews,Anthony J. Michael,Noel Ellis
出处
期刊:Current Biology [Elsevier]
卷期号:7 (8): 581-587 被引量:358
标识
DOI:10.1016/s0960-9822(06)00257-0
摘要

Background: The vegetative phenotype of the pea mutant unifoliata (uni) is a simplification of the wild-type compound leaf to a single leaflet. Mutant uni plants are also self-sterile and the flowers resemble known floral meristem and organ identity mutants. In Antirrhinum and Arabidopsis, mutations in the floral meristem identity gene FLORICAULA/LEAFY (FLO/LFY) affect flower development alone, whereas the tobacco FLO/LFY homologue, NFL, is expressed in vegetative tissues, suggesting that NFL specifies determinacy in the progenitor cells for both flowers and leaves. In this paper, we characterised the pea homologue of FLO/LFY.Results: The pea cDNA homologue of FLO/LFY, PEAFLO, mapped to the uni locus in recombinant-inbred mapping populations and markers based on PEAFLO cosegregated with uni in segregating sibling populations. The characterisation of two spontaneous uni mutant alleles, one containing a deletion and the other a point mutation in the PEAFLO coding sequences, predicted that PEAFLO corresponds to UNI and that the mutant vegetative phenotype was conferred by the defective PEAFLO gene.Conclusions: The uni mutant demonstrates that there are shared regulatory processes in the morphogenesis of leaves and flowers and that floral meristem identity genes have an extended role in plant development. Pleiotropic regulatory genes such as UNI support the hypothesis that leaves and flowers derive from a common ancestral sporophyll-like structure. The regulation of indeterminacy during leaf and flower morphogenesis by UNI may reflect a primitive function for the gene in the pre-angiosperm era.
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