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Auxin modulates the enhanced development of root hairs in Arabidopsis thaliana (L.) Heynh. under elevated CO 2
Author(s) -
NIU YAOFANG,
JIN CHONGWEI,
JIN GULEI,
ZHOU QINGYAN,
LIN XIANYONG,
TANG CAIXIAN,
ZHANG YONGSONG
Publication year - 2011
Publication title -
plant, cell and environment
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.646
H-Index - 200
eISSN - 1365-3040
pISSN - 0140-7791
DOI - 10.1111/j.1365-3040.2011.02330.x
Subject(s) - root hair , auxin , arabidopsis thaliana , arabidopsis , epidermis (zoology) , mutant , botany , lateral root , biology , microbiology and biotechnology , gene , biochemistry , anatomy
Root hairs may play a critical role in nutrient acquisition of plants grown under elevated CO 2 . This study investigated how elevated CO 2 enhanced the development of root hairs in Arabidopsis thaliana (L.) Heynh. The plants under elevated CO 2 (800 µ L L −1 ) had denser and longer root hairs, and more H‐positioned cells in root epidermis than those under ambient CO 2 (350 µ L L −1 ). The elevated CO 2 increased auxin production in roots. Under elevated CO 2 , application of either 1‐naphthoxyacetic acid (1‐NOA) or N‐1‐naphthylphthalamic acid (NPA) blocked the enhanced development of root hairs. The opposite was true when the plants under ambient CO 2 were treated with 1‐naphthylacetic acid (NAA), an auxin analogue. Furthermore, the elevated CO 2 did not enhance the development of root hairs in auxin‐response mutants, axr1‐3 , and auxin‐transporter mutants, axr4‐1, aux1‐7 and pin1‐1 . Both elevated CO 2 and NAA application increased expressions of caprice, triptychon and rho‐related protein from plants 2 , and decreased expressions of werewolf, GLABRA2, GLABRA3 and the transparent testa glabra 1 , genes related to root‐hair development, while 1‐NOA and NPA application had an opposite effect. Our study suggests that elevated CO 2 enhanced the development of root hairs in Arabidopsis via the well‐characterized auxin signalling and transport that modulate the initiation of root hairs and the expression of its specific genes.