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Influence of the Shoot Tip and Leaves on Circumnutation in Green Pea Seedlings
Author(s) -
Tepper H. B.,
Yang R. L.
Publication year - 1996
Publication title -
botanica acta
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.871
H-Index - 87
eISSN - 1438-8677
pISSN - 0932-8629
DOI - 10.1111/j.1438-8677.1996.tb00603.x
Subject(s) - pisum , sativum , biology , shoot , auxin , botany , elongation , lanolin , horticulture , chemistry , materials science , ultimate tensile strength , metallurgy , gene , biochemistry , organic chemistry
Portions of the shoot system from young light‐grown pea ( Pisum sativum L.) seedlings were excised and circumnutation studied using time‐lapse cinematography. Removal of the youngest leaf or shoot tip as well as ringing the stem with 20 mM triiodobenzoic acid severely restricted circumnutation. Treating the stump of the excised leaf with lanolin containing 10 −4 M indole‐3‐acetic acid or replacing the leaf with an artificial aluminum leaf both partially restored circumnutation. When the leaf was replaced with both auxin and an artificial leaf circumnutation continued at approximately the rate of the intact plant. This graphically shows the involvement of both auxin and gravitropism in circumnutation.