Snowden Kimberley C, Napoli Carolyn A
HortResearch, Private bag 92169, Mt Albert, Auckland, New Zealand. Corresponding author; email:
Department of Plant Sciences, University of Arizona, Tucson, AZ 85721-0036, USA.
Funct Plant Biol. 2003 Oct;30(9):987-994. doi: 10.1071/FP03081.
The monopodial shoot axis of petunia (Petunia hybrida Vilm) has two different patterns of branch development. Basal lateral branching develops acropetally and is limited to a discrete number of nodes that correlate with the late rosette phase of growth (Zone II). Two zones of suppressed buds immediately precede and follow this zone of branching. Apical branching occurs in response to flowering, develops in a basipetal direction, and is restricted to the distal-most nodes on the monopodial axis. When grown under a short-day regime, an extension to the basal branching zone occurs, and growth of the main shoot axis is retarded. The sym1 mutant has an overall decrease in basal lateral branching compared with wild type whereas the three dad mutants have increased basal branching. The dad1-1 and dad2-1 mutants have no initial zone of suppressed branching whereas the dad3 mutant has a similar Zone II to wild type, but with a greater potential to form branches within this zone. The dad1-1 mutant exhibits delayed flowering, but the dad1-1 sym1 double mutant flowers at a similar node number to wild-type and branching is similar to dad1-1 indicating that these two aspects of the mutant dad1-1 phenotype are independent.
矮牵牛（Petunia hybrida Vilm）的单轴茎轴有两种不同的分枝发育模式。基部侧枝向顶发育，且仅限于与生长后期莲座叶阶段（II区）相关的离散节数。在这个分枝区之前和之后紧接着有两个抑制芽区。顶端分枝是对开花的响应，向基部方向发育，且仅限于单轴茎轴上最远端的节。在短日照条件下生长时，基部分枝区会扩展，主茎轴的生长会受到抑制。与野生型相比，sym1突变体的基部侧枝总体减少，而三个dad突变体的基部分枝增加。dad1-1和dad2-1突变体没有初始的抑制分枝区，而dad3突变体与野生型有相似的II区，但在该区内形成分枝的潜力更大。dad1-1突变体表现出开花延迟，但dad1-1 sym1双突变体在与野生型相似的节数处开花，且分枝与dad1-1相似，这表明突变体dad1-1表型的这两个方面是独立的。
