Role of the Arabidopsis PIN6 auxin transporter in auxin homeostasis and auxin-mediated development.
Role of the Arabidopsis PIN6 auxin transporter in auxin homeostasis and auxin-mediated development.
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DOI：
10.1371/journal.pone.0070069
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发表时间：
2013
期刊：
影响因子：
3.7
通讯作者：
Pogson BJ
中科院分区：
文献类型：
--
作者：
Cazzonelli CI;Vanstraelen M;Simon S;Yin K;Carron-Arthur A;Nisar N;Tarle G;Cuttriss AJ;Searle IR;Benkova E;Mathesius U;Masle J;Friml J;Pogson BJ
植物生长素的PIN外排转运蛋白是植物生长素组织特异性定向转运和细胞生长素稳态所必需的。拟南芥PIN蛋白家族在胚胎发生、器官发生、维管组织分化、根分生组织形成和营养生长等发育过程中发挥重要作用。在这里，我们分析的作用，较少的特点拟南芥PIN 6生长素转运。PIN 6是生长素诱导的，在多种生长素调节的发育过程中表达。pin 6功能的丧失干扰了主根的生长和侧根的发育。PIN 6的错误表达影响了生长素的运输，并干扰了生长素在其他生长过程中的稳态，如茎尖优势、侧根原基发育、不定根形成、根毛生长和根的摆动。生长素调节生长的这些变化与总生长素运输的减少以及DR 5-GUS生长素反应报告子的活性改变相关。总体而言，数据表明PIN 6在植物发育期间调节生长素稳态。
Plant-specific PIN-formed (PIN) efflux transporters for the plant hormone auxin are required for tissue-specific directional auxin transport and cellular auxin homeostasis. The Arabidopsis PIN protein family has been shown to play important roles in developmental processes such as embryogenesis, organogenesis, vascular tissue differentiation, root meristem patterning and tropic growth. Here we analyzed roles of the less characterised Arabidopsis PIN6 auxin transporter. PIN6 is auxin-inducible and is expressed during multiple auxin–regulated developmental processes. Loss of pin6 function interfered with primary root growth and lateral root development. Misexpression of PIN6 affected auxin transport and interfered with auxin homeostasis in other growth processes such as shoot apical dominance, lateral root primordia development, adventitious root formation, root hair outgrowth and root waving. These changes in auxin-regulated growth correlated with a reduction in total auxin transport as well as with an altered activity of DR5-GUS auxin response reporter. Overall, the data indicate that PIN6 regulates auxin homeostasis during plant development.
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