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The blue light receptor Phototropin 1 suppresses lateral root growth by controlling cell elongation
Author(s) -
Moni A.,
Lee A.Y.,
Briggs W. R.,
Han I.S.
Publication year - 2015
Publication title -
plant biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 1435-8603
DOI - 10.1111/plb.12187
Subject(s) - phototropin , biology , elongation , lateral root , auxin , arabidopsis , mutant , arabidopsis thaliana , microbiology and biotechnology , botany , wild type , phototropism , biophysics , blue light , biochemistry , gene , materials science , ultimate tensile strength , metallurgy , optoelectronics
We investigated the relationship between the blue light receptor phototropin 1 (phot1) and lateral root growth in Arabidopsis thaliana seedlings. Fluorescence and confocal microscopy images, as well as PHOT1 mRNA expression studies provide evidence that it is highly expressed in the elongation zone of lateral roots where auxin is accumulating. However, treatment with the auxin transport inhibitor N ‐1‐naphthylphthalamic acid significantly reduced PHOT1 expression in this zone. In addition, PHOT1 expression was higher in darkness than in light. The total number of lateral roots was higher in the phot1 mutant than in wild‐type Arabidopsis . Cells in the elongation zone of lateral roots of the phot1 mutant were longer than those of wild‐type lateral roots. These findings suggest that PHOT 1 plays a role(s) in elongation of lateral roots through the control of an auxin‐related signalling pathway.