SHORT-ROOT regulates primary, lateral and adventitious root development in Arabidopsis

Lucas, Mikael, Swarup, Ranjan, Paponov, Ivan A., Swarup, Kamal, Casimiro, Ilda, Lake, David, Peret, Benjamin, Zappala, Susan, Mairhofer, Stefan, Whitworth, Morag, Wang, Jie hua, Ljung, Karin, Marchant, Alan, Sandberg, Goran, Holdsworth, Michael J., Palme, Klaus, Pridmore, Tony, Mooney, Sacha and Bennett, Malcolm J. (2010) SHORT-ROOT regulates primary, lateral and adventitious root development in Arabidopsis Plant Physiology, 155, (1), pp. 384-398. (doi:10.1104/pp.110.165126).


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SHORT-ROOT (SHR) is a well characterised regulator of radial patterning and indeterminacy of the Arabidopsis primary root. However, its role during the elaboration of root system architecture (RSA) remains unclear. We report that the indeterminate wild-type Arabidopsis root system was transformed into a determinate root system in the short-root (shr) mutant when growing in soil or agar. The root growth behaviour of the shr mutant results from its primary root apical meristem (RAM) failing to initiate cell division following germination. The inability of shr to reactivate mitotic activity in the RAM is associated with the progressive reduction in the abundance of auxin efflux carriers, PIN1, PIN2, PIN3, PIN4 and PIN7. The loss of primary root growth in shr is compensated by the activation of anchor root primordia whose tissues are radially patterned like wildtype. However, SHR function is not restricted to the primary root but is also required for the initiation and patterning of LRP. In addition, SHR is necessary to maintain the indeterminate growth of lateral and anchor roots. We conclude SHR regulates a wide array of Arabidopsis root-related developmental processes

Item Type: Article
Digital Object Identifier (DOI): doi:10.1104/pp.110.165126
ISSNs: 0032-0889 (print)
ePrint ID: 169157
Date :
Date Event
27 October 2010Published
Date Deposited: 13 Dec 2010 08:57
Last Modified: 18 Apr 2017 03:32
Further Information:Google Scholar

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