Mathematical modeling of auxin transport in protoxylem and protophloem of Arabidopsis thaliana root tips.
Mathematical modeling of auxin transport in protoxylem and protophloem of Arabidopsis thaliana root tips.
复制标题
拟南芥根尖原木质部和原韧皮部生长素运输的数学模型。
DOI：
10.1142/s0219720013400106
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发表时间：
2013
影响因子：
1
通讯作者：
Likhoshvai,VitalyA
中科院分区：
文献类型：
--
作者：
Novoselova,EkaterinaS;Mironova,VictoriaV;Omelyanchuk,NadyaA;Kazantsev,FedorV;Likhoshvai,VitalyA
植物激素生长素是植物生长发育的主要调节因子。生长素在植物组织中的不均匀分布决定了植物的形态建成。生长素在组织中通过扩散和主动转运通过细胞膜进行转运。有许多生长素载体执行其流入细胞（AUX\LAX家族）或从细胞流出（PIN、PGP家族）。本文建立了拟南芥根尖维管组织（原生韧皮部和原生木质部）生长素运输的数学模型。这些模型考虑了生长素主动运输的组织特异性。在原生木质部和原生韧皮部中都存在PIN介导的生长素流出，而AUX 1介导的生长素流入只存在于原生韧皮部。调整模型解的最佳参数值，以拟合实验观察到的生长素在根尖中的分布。基于模拟结果，我们预测，茎源生长素流到原生韧皮部低于一个原生木质部，和PIN介导的生长素运输的效率在原生韧皮部高于原生木质部。总之，我们的模拟表明，尽管相同的生长素分布模式，在根尖原维管组织生长素运输的动力学不同。
Phytohormone auxin is the main regulator of plant growth and development. Nonuniform auxin distribution in plant tissue sets positional information, which determines morphogenesis. Auxin is transported in tissue by means of diffusion and active transport through the cell membrane. There is a number of auxin carriers performing its influx into a cell (AUX\LAX family) or efflux from a cell (PIN, PGP families). The paper presents mathematical models for auxin transport in vascular tissues ofArabidopsis thaliana L.root tip, namely protophloem and protoxylem. Tissue specificity of auxin active transport was considered in these models. There is PIN-mediated auxin efflux in both protoxylem and protophloem, but AUX1-mediated influx exists only in protophloem. Optimal values of parameters were adjusted for model solutions to fit the experimentally observed auxin distributions in the root tip. Based on simulation results we predicted that shoot-derived auxin flow to protophloem is lower than one to protoxylem, and the efficiency of PIN-mediated auxin transport in protophloem is higher than in protoxylem. In summary, our simulation showed that despite the same auxin distribution pattern, provascular tissues in the root tip differ in dynamics of auxin transport.