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Site of in vivo Regulation of Tree Stem Elongation by Bark‐Banded Morphactins
Author(s) -
NEUMANN PETER M.,
BACKHAUS RALPH,
DOSS ROBERT P.,
SACHS ROY M.
Publication year - 1977
Publication title -
physiologia plantarum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.351
H-Index - 146
eISSN - 1399-3054
pISSN - 0031-9317
DOI - 10.1111/j.1399-3054.1977.tb01494.x
Subject(s) - elongation , shoot , bark (sound) , pinus radiata , botany , endodermis , radiata , chemistry , apex (geometry) , pinus <genus> , biology , ecology , materials science , vigna , ultimate tensile strength , metallurgy
Morphactin ester applied as a bark band to stems of Monterey pine seedlings ( Pinus radiata D. Don) at first stimulated and then inhibited the rate of stem elongation over a 20‐day period. The inhibition was caused by a direct action of morphactin on the shoot rather than by indirect action on the root system. 14 C labelled morphactin applied to the bark accumulated in the shoot apices and the amount accumulated could be related to the inhibition of growth. More than 70% of labelled material isolated from roots and shoot apices was in the form of a metabolite similar to the carboxylic acid derivative of the morphactin ester. A preparation of 14 C labelled acid derivative applied to the bark was translocated to the shoot apex and to the roots and inhibited stem elongation.