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Studies on plant growth‐regulating substances.: The effects of light and hormone inhibitors on plant root growth
Author(s) -
WILKINS H.,
LARQUÉSAAVEDRA A.,
WAIN R. L.
Publication year - 1974
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1974.tb01495.x
Subject(s) - neoxanthin , biology , violaxanthin , elongation , lutein , botany , growth inhibition , zea mays , root cap , carotenoid , biochemistry , zeaxanthin , agronomy , shoot , cell growth , meristem , materials science , ultimate tensile strength , metallurgy
SUMMARY Light inhibition of primary root elongation in Zea mays seedlings was found to be an almost instantaneous response and the inhibitory effect was shown to persist for at least six hours following a short exposure to white light. Removal of the root cap completely removed the inhibitory effect of light. The apical region of the root appeared to be mainly responsible for perceiving light and initiating the production of factors involved in the inhibition of elongation. Extraction of the roots of light‐exposed Zea seedlings revealed the presence of the carotenoid pigments, violaxanthin, neoxanthin and lutein, together with an unidentified non‐acidic growth‐inhibitory compound. Xanthoxin, however, was not detected.