Premium
QUANTITATIVE AND QUALITATIVE DIFFERENCES IN PLANT RESPONSE TO THE GIBBERELLINS
Author(s) -
Wittwer S. H.,
Bukovac M. J.
Publication year - 1962
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/j.1537-2197.1962.tb14975.x
Subject(s) - gibberellin , biology , phaseolus , epicotyl , sativum , pisum , botany , elongation , tendril , cucumis , lycopersicon , hypocotyl , horticulture , materials science , metallurgy , ultimate tensile strength
W ittwer , S. H., and M. J. B ukovac . (Michigan State U., E. Lansing.) Quantitative and qualitative differences in plant response to the gibberellins. Amer. Jour. Bot. 49(5): 524–529. Illus. 1962.—The comparative biological activities of gibberellins A 1 through A 9 were evaluated, over a wide concentration range and in several test systems. All gibberellins were effective in promoting stem elongation of dwarf peas ( Pisum sativum) , and, with the exception of A 8 , epicotyl growth in Phaseolus vulgaris. Elongation of Cucumis sativus seedlings was strikingly greater with A 4 , A 7 , and A 9 than with the other gibberellins. With mutant dwarfs of Zea mays , A 5 and A 9 were the most active gibberellins for d 3 and d 5 , and relatively ineffective compared to A 3 on d 1 . Gibberellins A 2 , A 7 , and A 8 were less effective than A 3 on all dwarfs. Qualitative and quantitative differences among the gibberellins were noted on seedstalk elongation and flowering of Lactuca sativa , with A 3 the most active followed by A 1 , A 7 , A 4 , and A 9 . No flowering or seedstalk elongation occurred with A 2 , A 6 or A 8 . Parthenocarpic fruit growth in Lycopersicon esculentum was a function of dosage with all gibberellins. At the lowest levels, A 5 and A 7 were the most active, while at the highest levels all gibberellins with the exception of A 8 were equally effective. The results suggest a high degree of species and response specificity among the known fungal and higher plant gibberellins, and demonstrate the importance of utilizing a wide spectrum of plant responses and dosage levels in the biological assay of plant extracts for native gibberellins.