The Arabidopsis SPIKE1 gene is required for normal cell shape control and tissue development

被引:164
作者
Qiu, JL
Jilk, R
Marks, MD
Szymanski, DB
机构
[1] Purdue Univ, Dept Agron, W Lafayette, IN 47907 USA
[2] Univ Minnesota, Dept Plant Biol, St Paul, MN 55108 USA
[3] Univ Minnesota, Inst Plant Mol Genet, St Paul, MN 55108 USA
关键词
D O I
10.1105/tpc.010346
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Regulated growth and cell shape control are fundamentally important to the function of plant cells, tissues, and organs. The signal transduction cascades that control localized growth and cell shape, however, are not known. To better understand the relationship between cytoskeletal organization, organelle positioning, and regulated vesicle transport, we conducted a forward genetic screen to identify genes that regulate cytoskeletal organization in plants. Because of the distinct requirements for microtubules and actin filaments during leaf trichome development, a trichome-based morphology screen is an efficient approach to identify genes that affect cytoplasmic organization. The seedling lethal spike1 mutant was identified based on trichome, cotyledon, and leaf-shape defects. The predicted SPIKE1 protein shares amino acid identity with a large family of adapter proteins present in humans, flies, and worms that integrate extracellular signals with cytoskeletal reorganization. Both the trichome phenotype and immunolocalization data suggest that SPIKE1 also is involved in cytoskeletal reorganization. The assembly of laterally clustered foci of microtubules and polarized growth are early events in cotyledon development, and both processes are misregulated in spike1 epidermal cells.
引用
收藏
页码:101 / 118
页数:18
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