Abstract:
:The role of H(+) excretion in auxin-induced growth of soybean hypocotyl tissues has been investigated, using tissues whose cuticle was rendered permeable to protons or buffers by scarification (scrubbing). Indoleacetic acid induces both elongation and H(+) excretion after a lag of 10 to 12 minutes. Cycloheximide inhibits growth and causes the tissues to remove protons from the medium. Neutral buffers (pH 7.0) inhibit auxin-induced growth of scrubbed but not intact sections; the inhibition increases as the buffer strength is increased. Both live and frozen-thawed sections, in the absence of auxin, extend in response to exogenously supplied protons. Fusicoccin induces both elongation and H(+) excretion at rates greater than does auxin. These results indicate that H(+) excretion is involved in the initiation of auxin-induced elongation in soybean hypocotyl tissue.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Rayle DL,Cleland REdoi
10.1104/pp.66.3.433subject
Has Abstractpub_date
1980-09-01 00:00:00pages
433-7issue
3eissn
0032-0889issn
1532-2548journal_volume
66pub_type
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