TAILIEUCHUNG - báo cáo khoa học: " The development and geometry of shape change in Arabidopsis thaliana cotyledon pavement cells"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành y học dành cho các bạn tham khảo đề tài: The development and geometry of shape change in Arabidopsis thaliana cotyledon pavement cells | Zhang et al. BMC Plant Biology 2011 11 27 http 1471-2229 11 27 BMC Plant Biology RESEARCH ARTICLE Open Access The development and geometry of shape change in Arabidopsis thaliana cotyledon pavement cells Chunhua Zhang1 Leah E Halsey1 Daniel B Szymanski1 2 Abstract Background The leaf epidermis is an important architectural control element that influences the growth properties of underlying tissues and the overall form of the organ. In dicots interdigitated pavement cells are the building blocks of the tissue and their morphogenesis includes the assembly of specialized cell walls that surround the apical basal and lateral anticlinal cell surfaces. The microtubule and actin cytoskeletons are highly polarized along the cortex of the anticlinal wall however the relationships between these arrays and cell morphogenesis are unclear. Results We developed new quantitative tools to compare population-level growth statistics with time-lapse imaging of cotyledon pavement cells in an intact tissue. The analysis revealed alternating waves of lobe initiation and a phase of lateral isotropic expansion that persisted for days. During lateral isotropic diffuse growth microtubule organization varied greatly between cell surfaces. Parallel microtubule bundles were distributed unevenly along the anticlinal surface with subsets marking stable cortical domains at cell indentations and others clearly populating the cortex within convex cell protrusions. Conclusions Pavement cell morphogenesis is discontinuous and includes punctuated phases of lobe initiation and lateral isotropic expansion. In the epidermis lateral isotropic growth is independent of pavement cell size and shape. Cortical microtubules along the upper cell surface and stable cortical patches of anticlinal microtubules may coordinate the growth behaviors of orthogonal cell walls. This work illustrates the importance of directly linking protein localization data to the growth behavior of leaf epidermal

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