TY - JOUR
T1 - Abscission in Coleus
T2 - Light and phytohormone control
AU - Mao, Zhongyuan
AU - Craker, Lyle E.
AU - Decoteau, Dennis R.
N1 - Funding Information:
1 Supported in part from Experiment Station Project no. 603 and grants from the Gloeckner Foundation Paper no. 2780, Massachusetts Agricultural Experiment Station, University of Masachussetts at Amherst. 2 To whom correspondence should be addressed. 3 Present address: Department of Horticulture, Clemson University, Clemson, SC 29634, USA.
PY - 1989/11
Y1 - 1989/11
N2 - Light control of leaf abscission in Coleus (Coleus blumei Benth cv. Ball 2719 Red) appears to be regulated by the quantity of endogenous auxin transported from the leaf blade to the abscission zone. Gas chromatographic-mass spectrophotometric analysis indicated that diffusate collected from leaf tissue treated with red light contained significantly higher levels of auxin than dark and far-red light-treated leaf tissue. In addition, diffusate from red light-treated tissue inhibited abscission of leafless petioles while diffusate from far-red light-treated tissue promoted abcission when compared with diffusate from dark-treated tissue. The effect of red light on abscission could be mimicked by IAA, but not by other phytohormones. An auxin transport inhibitor, 2, 3, 5-triiodobenzoic acid (TIBA), applied either as a lanolin ring around the petiole or vacuum infiltrated into tissue, could completely eliminate any red light effect on abscission. The data are consistent with a phytochrome-mediated light regulation of endogenous auxin level in the leaf which then controls abscission.
AB - Light control of leaf abscission in Coleus (Coleus blumei Benth cv. Ball 2719 Red) appears to be regulated by the quantity of endogenous auxin transported from the leaf blade to the abscission zone. Gas chromatographic-mass spectrophotometric analysis indicated that diffusate collected from leaf tissue treated with red light contained significantly higher levels of auxin than dark and far-red light-treated leaf tissue. In addition, diffusate from red light-treated tissue inhibited abscission of leafless petioles while diffusate from far-red light-treated tissue promoted abcission when compared with diffusate from dark-treated tissue. The effect of red light on abscission could be mimicked by IAA, but not by other phytohormones. An auxin transport inhibitor, 2, 3, 5-triiodobenzoic acid (TIBA), applied either as a lanolin ring around the petiole or vacuum infiltrated into tissue, could completely eliminate any red light effect on abscission. The data are consistent with a phytochrome-mediated light regulation of endogenous auxin level in the leaf which then controls abscission.
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U2 - 10.1093/jxb/40.11.1273
DO - 10.1093/jxb/40.11.1273
M3 - Article
AN - SCOPUS:0004418977
SN - 0022-0957
VL - 40
SP - 1273
EP - 1277
JO - Journal of experimental botany
JF - Journal of experimental botany
IS - 11
ER -