کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2045446 1073486 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Vectorial Information for Arabidopsis Planar Polarity Is Mediated by Combined AUX1, EIN2, and GNOM Activity
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم کشاورزی و بیولوژیک (عمومی)
پیش نمایش صفحه اول مقاله
Vectorial Information for Arabidopsis Planar Polarity Is Mediated by Combined AUX1, EIN2, and GNOM Activity
چکیده انگلیسی

SummaryCell polarity is commonly coordinated within the plane of a single tissue layer (planar polarity), and hair positioning has been exploited as a simple marker for planar polarization of animal epithelia [1]. The root epidermis of the plant Arabidopsis similarly reveals planar polarity of hair localization close to root tip-oriented (basal) ends of hair-forming cells 2, 3 and 4. Hair position is directed toward a concentration maximum of the hormone auxin in the root tip 4 and 5, but mechanisms driving this plant-specific planar polarity remain elusive. Here, we report that combinatorial action of the auxin influx carrier AUX1 6 and 7, ETHYLENE-INSENSITIVE2 (EIN2) [8], and GNOM [9] genes mediates the vector for coordinate hair positioning. In aux1;ein2;gnomeb triple mutant roots, hairs display axial (apical or basal) instead of coordinate polar (basal) position, and recruitment of Rho-of-Plant (ROP) GTPases to the hair initiation site 10 and 11 reveals the same polar-to-axial switch. The auxin concentration gradient is virtually abolished in aux1;ein2;gnomeb roots, where locally applied auxin can coordinate hair positioning. Moreover, auxin overproduction in sectors of wild-type roots enhances planar ROP and hair polarity over long and short distances. Hence, auxin may provide vectorial information for planar polarity that requires combinatorial AUX1, EIN2, and GNOM activity upstream of ROP positioning.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: - Volume 16, Issue 21, 7 November 2006, Pages 2143–2149
نویسندگان
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