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STUDIES ON THE GROWTH OF EXCISED ROOTS
Author(s) -
CHARLES H. P.
Publication year - 1959
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1959.tb05337.x
Subject(s) - lysine , strain (injury) , biology , plant growth , botany , food science , horticulture , amino acid , biochemistry , anatomy
S ummary A study has been made of the effects of 2‐naphthoxyacetic acid (2‐NOA) on excised roots from various strains of groundsel. The roots were grown in medium containing lysine and 2‐NOA for one passage and were then subcultured into arginine medium for their second passage.‘Directly’ the effect of 2‐NOA was to increase, though to different levels, the growth of the roots of all strains.‘Indirectly’ and at a concentration appropriate to each strain, it increased the growth of all four strains up to the same high level. The hypothesis is advanced that a major factor responsible for the different growth rates of the roots of the different strains is their content of a natural growth substance whose physiological properties are simulated by 2‐NOA.