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Fig. 1. | BMC Biology

Fig. 1.

From: Plant hormone transporters: what we know and what we would like to know

Fig. 1.

Main auxin transport routes and transporters in Arabidopsis seedlings and growth phenotypes of adult, mutant plants lacking auxin exporters. a Contribution of ABCB-, AUX1/LAX-, and PIN-type transporters in main auxin (IAA) transport routes (arrows) of seedling roots and hypocotyls, where auxin research has been focused. Concerted actions indicating a shared, overlapping function of two (or more) PIN- and ABCB-type auxin exporters (for details, see [12]) are designated by color-coded arrows. Figure modified from [12]. b Growth phenotypes of soil-grown plants defective in auxin export. From left to right: wild type (ecotype Wassilewskija, Ws), abcb1-1/abcb19-1 (taken from [36], and reprinted by permission of the publisher, Taylor & Francis Ltd, http://www.tandfonline.com) and pin1-1 (taken from [154] with permission). Note that, in contrast to the abcb1 abcb19 double mutant, abcb1 and abcb19 single mutants reveal only very subtle growth phenotypes, suggesting—despite opposite main transport routes—complementary action by ABCB19 and ABCB1 isoforms, respectively. Also note that other single PIN and higher order PIN mutants (without PIN1) [28] as well as single AUX1/LAX mutants and the quadruple aux1/lax mutant [23] reveal only very subtle growth phenotypes

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