An Auxin Transport Mechanism Restricts Positive Orthogravitropism in Lateral Roots
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چکیده
منابع مشابه
An Auxin Transport Mechanism Restricts Positive Orthogravitropism in Lateral Roots
As soon as a seed germinates, plant growth relates to gravity to ensure that the root penetrates the soil and the shoot expands aerially. Whereas mechanisms of positive and negative orthogravitropism of primary roots and shoots are relatively well understood, lateral organs often show more complex growth behavior. Lateral roots (LRs) seemingly suppress positive gravitropic growth and show a def...
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The lateral movement of auixin has been stuidied with bioassays and also by application of '4C-IAA. Both techniqutes have demonstrated that the tupper hal,f of a horizontally positioned stem or root contains at least 30 to 45 % of the total auxin present in the tissuie (2). However, such an auxin gradient is difficult to reconcile with the Cholodny-WVent theory of root geotropism becatuse it is...
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Plant stems and roots orient themselves with respect to directional illumination and gravity by differential growth on either side of the organ. A model formulated in the 1930s proposed that tropic growth curvature arose from growth hormone redistribution. Studies with Arabidopsis are beginning to reveal the mechanism.
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Lateral root development in Arabidopsis provides a model for the study of hormonal signals that regulate postembryonic organogenesis in higher plants. Lateral roots originate from pairs of pericycle cells, in several cell files positioned opposite the xylem pole, that initiate a series of asymmetric, transverse divisions. The auxin transport inhibitor N-1-naphthylphthalamic acid (NPA) arrests l...
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Acropetal [(14)C]indoleacetic acid (IAA) transport was investigated in roots of corn. At least 40 to 50% of this movement is dependent on activities in the root apex. Selective excision of various populations of cells comprising the root apex, e.g. the root cap, quiescent center, or proximal meristem show that the proximal meristem is the critical region in the apex with regard to influencing I...
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ژورنال
عنوان ژورنال: Current Biology
سال: 2013
ISSN: 0960-9822
DOI: 10.1016/j.cub.2013.03.064