Chuck G, Meeley R B, Hake S
Department of Plant and Microbial Biology, University of California, Berkeley, California 94720, USA.
Genes Dev. 1998 Apr 15;12(8):1145-54. doi: 10.1101/gad.12.8.1145.
The orderly production of meristems with specific fates is crucial for the proper elaboration of plant architecture. The maize inflorescence meristem branches several times to produce lateral meristems with determinate fates. The first meristem formed, the spikelet pair meristem, produces two spikelet meristems, each of which produces two floral meristems. We have identified a gene called indeterminate spikelet1 (ids1) that specifies a determinate spikelet meristem fate and thereby limits the number of floral meristems produced. In the absence of ids1 gene function, the spikelet meristem becomes indeterminate and produces additional florets. Members of the grass family vary in the number of florets within their spikelets, suggesting that ids1 may play a role in inflorescence architecture in other grass species. ids1 is a member of the APETALA2 (AP2) gene family of transcription factors that has been implicated in a wide range of plant development roles. Expression of ids1 was detected in many types of lateral organ primordia as well as spikelet meristems. Our analysis of the ids1 mutant phenotype and expression pattern indicates that ids1 specifies determinate fates by suppressing indeterminate growth within the spikelet meristem.
有序产生具有特定命运的分生组织对于正确构建植物结构至关重要。玉米花序分生组织多次分支以产生具有确定命运的侧生分生组织。形成的第一个分生组织，即小穗对分生组织，产生两个小穗分生组织，每个小穗分生组织又产生两个花分生组织。我们鉴定出一个名为 indeterminate spikelet1（ids1）的基因，它决定了小穗分生组织的确定命运，从而限制了产生的花分生组织的数量。在缺乏 ids1 基因功能的情况下，小穗分生组织变得不确定，并产生额外的小花。禾本科植物小穗内的小花数量各不相同，这表明 ids1 可能在其他禾本科物种的花序结构中发挥作用。ids1 是转录因子 APETALA2（AP2）基因家族的成员，该家族已被证明在广泛的植物发育过程中发挥作用。在许多类型的侧生器官原基以及小穗分生组织中都检测到了 ids1 的表达。我们对 ids1 突变体表型和表达模式的分析表明，ids1 通过抑制小穗分生组织内的不确定生长来决定确定的命运。
