Plasma membrane H⁺ -ATPase regulation is required for auxin gradient formation preceding phototropic growth.

ABSTRACT: Phototropism is a growth response allowing plants to align their photosynthetic organs toward incoming light and thereby to optimize photosynthetic activity. Formation of a lateral gradient of the phytohormone auxin is a key step to trigger asymmetric growth of the shoot leading to phototropic reorientation. To identify important regulators of auxin gradient formation, we developed an auxin flux model that enabled us to test in silico the impact of different morphological and biophysical parameters on gradient formation, including the contribution of the extracellular space (cell wall) or apoplast. Our model indicates that cell size, cell distributions, and apoplast thickness are all important factors affecting gradient formation. Among all tested variables, regulation of apoplastic pH was

SUBMITTER: Hohm T 

PROVIDER: S-EPMC4299663 | biostudies-literature | 2014 Sep

REPOSITORIES: biostudies-literature