Max Planck Institute for Plant Breeding Research, Carl von Linné Weg 10, D-50829 Cologne, Germany.
Plant J. 2010 Nov;64(4):668-78. doi: 10.1111/j.1365-313X.2010.04359.x. Epub 2010 Oct 8.
Meristems of seed plants continuously produce new cells for incorporation into maturing tissues. A tightly controlled balance between cell proliferation in the center and cell differentiation at the periphery of the shoot meristem maintains its integrity. Here, we describe the role of three GRAS genes, named LOST MERISTEMS genes, in shoot apical meristem maintenance and axillary meristem formation. Under short photoperiods, the lom1 lom2 and lom1 lom2 lom3 mutants have arrested meristems characterized by an over-proliferation of meristematic cells and loss of polar organization. They also show early arrest of axillary meristem development and formation of ectopic meristematic cell clusters within the stem. LOM1 and LOM2 transcripts accumulate in the peripheral and basal zones of the SAM and in vascular strands. We show that LOM1 and LOM2 promote cell differentiation at the periphery of shoot meristems and help to maintain their polar organization.
种子植物的分生组织不断产生新的细胞，以纳入成熟组织。在茎分生组织中心的细胞增殖和外周的细胞分化之间保持着紧密的平衡，以维持其完整性。在这里，我们描述了三个 GRAS 基因（命名为 LOST MERISTEMS 基因）在茎尖分生组织维持和腋芽分生组织形成中的作用。在短光照条件下，lom1 lom2 和 lom1 lom2 lom3 突变体的分生组织停滞，表现为分生组织细胞过度增殖和极性组织丧失。它们还表现出腋芽分生组织发育的早期停滞和茎内异位分生组织细胞簇的形成。LOM1 和 LOM2 转录本在 SAM 的外周和基部区以及维管束中积累。我们表明，LOM1 和 LOM2 促进了茎分生组织外周的细胞分化，并有助于维持其极性组织。
