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Activity of Various Growth Substances in the Avena First Internode Test
Author(s) -
JUNTTILA OLAVI,
HEIDE OLA M.
Publication year - 1973
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.1399-3054.1973.tb04840.x
Subject(s) - abscisic acid , kinetin , avena , gibberellin , elongation , chemistry , auxin , gibberellic acid , plant growth , cytokinin , botany , horticulture , stereochemistry , biochemistry , biology , germination , tissue culture , in vitro , materials science , gene , ultimate tensile strength , metallurgy
The elongation growth of the Avena first internode segments was studied in the presence of one or several of the following growth substances: indoleacetic acid (IAA), 6‐fur‐furylamino purine (FAP, kinetin), 6‐benzylamino purine (BAP), gibberellin A 3 (GA 3 ) and A 4+7 (GA 4+7 ), and abscisic acid (ABA). The cytokinins at concentrations of 10 −7 to 10 −6 M stimulated growth with 4 to 6 per cent but this effect was not statistically significant. Concentrations higher than 5 × 10 −6 M inhibited growth. FAP and BAP (from 10 −8 M to 10 −6 M ) had no significant interaction with any other growth substance used. The two‐factor interactions of IAA × ABA, IAA × GA 3 , and GA 3 × ABA, as well as the three‐factor interaction IAA × ABA × GA 3 were significant. However, the IAA × ABA interaction was significant only when high concentration (10 −6 M ) of ABA was used. The growth inhibition produced by 10 −7 and 10 −6 M ABA was overcome by about equimolar concentrations of IAA. The stimulation of growth by GA 3 and GA 4+7 (10 −9 to 10 −7 M ) was prevented by simultaneous application of ABA, and it was reduced significantly by application of IAA (10 −7 to 10 −8 M ). GA3 at 10 −8 M combined with different concentrations of IAA gave slightly higher elongation than IAA alone but the observed values were significantly lower than expected assuming independent additive action.