Microtubule-Mediated Wall Anisotropy Contributes to Leaf Blade Flattening.
Microtubule-Mediated Wall Anisotropy Contributes to Leaf Blade Flattening.
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DOI：
10.1016/j.cub.2020.07.076
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发表时间：
2020-10-19
期刊：
影响因子：
--
通讯作者：
Jiao Y
中科院分区：
文献类型：
--
作者：
Zhao F;Du F;Oliveri H;Zhou L;Ali O;Chen W;Feng S;Wang Q;Lü S;Long M;Schneider R;Sampathkumar A;Godin C;Traas J;Jiao Y
植物器官可以采用多种形状，这是由高度定向的细胞生长和分裂造成的。我们将重点放在拟南芥和番茄的叶片和叶状器官上，其特征是形成薄而平坦的叶片。结合实验方法和三维力学建模，我们提供的证据表明，叶片形状取决于皮层微管介导的纤维素沿着主要的预测应力方向沉积，特别是沿着细胞壁的近轴-背轴。这种行为可以用一种机械反馈来解释，并且有可能维持甚至扩大先前存在的平坦度，这反过来又取决于参与控制器官极性和叶缘形成的基因。微管和纤维素微原纤维沿自逆方向排列微管介导的细胞生长各向异性有助于叶片变平机械反馈解释了微管沿自逆方向排列最终器官形状取决于原始基初始不对称的程度叶片如何保持高度定向的细胞生长和分裂形成薄而平的层？Zhao等人的研究表明，微管和纤维素微原纤维沿内壁主应力方向排列，介导各向异性生长。微管介导的机械反馈放大了初始的不对称性并维持了定向生长。
Plant organs can adopt a wide range of shapes, resulting from highly directional cell growth and divisions. We focus here on leaves and leaf-like organs in Arabidopsis and tomato, characterized by the formation of thin, flat laminae. Combining experimental approaches with 3D mechanical modeling, we provide evidence that leaf shape depends on cortical microtubule mediated cellulose deposition along the main predicted stress orientations, in particular, along the adaxial-abaxial axis in internal cell walls. This behavior can be explained by a mechanical feedback and has the potential to sustain and even amplify a preexisting degree of flatness, which in turn depends on genes involved in the control of organ polarity and leaf margin formation. Microtubules and cellulose microfibrils align along the ad-abaxial direction Microtubule-mediated cell growth anisotropy contributes to leaf flattening Mechanical feedback accounts for microtubule alignments in the ad-abaxial direction Final organ shape depends on the degree of initial asymmetry of primordia How do leaves maintain highly directional cell growth and divisions to form thin, flat laminae? Zhao et al. show that microtubules and cellulose microfibrils align along the main stress direction of internal walls to mediate anisotropic growth. Microtubule-mediated mechanical feedback amplifies an initial asymmetry and maintains directional growth.
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影响因子：
7.7
作者：
Barbier de Reuille P;Routier-Kierzkowska AL;Kierzkowski D;Bassel GW;Schüpbach T;Tauriello G;Bajpai N;Strauss S;Weber A;Kiss A;Burian A;Hofhuis H;Sapala A;Lipowczan M;Heimlicher MB;Robinson S;Bayer EM;Basler K;Koumoutsakos P;Roeder AH;Aegerter-Wilmsen T;Nakayama N;Tsiantis M;Hay A;Kwiatkowska D;Xenarios I;Kuhlemeier C;Smith RS
通讯作者：
Smith RS
影响因子：
1.9
作者：
Oliveri, Hadrien;Traas, Jan;Ali, Olivier
通讯作者：
Ali, Olivier
影响因子：
7.7
作者：
Caggiano MP;Yu X;Bhatia N;Larsson A;Ram H;Ohno CK;Sappl P;Meyerowitz EM;Jönsson H;Heisler MG
通讯作者：
Heisler MG
影响因子：
11.6
作者：
Nakata, Miyuki;Matsumoto, Noritaka;Okada, Kiyotaka
通讯作者：
Okada, Kiyotaka
DOI：
10.1088/0508-3443/3/3/302
发表时间：
1952-01-01
期刊：
BRITISH JOURNAL OF APPLIED PHYSICS
影响因子：
--
作者：
COX, HL
通讯作者：
COX, HL