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Seasonal Effects in the Hormonal Control of Growth in the Submerged Aquatic Macrophyte Ceratophyllum demersum
Author(s) -
BEST ELLY P. H.,
SOEKARJO R.
Publication year - 1976
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.1399-3054.1976.tb03999.x
Subject(s) - ceratophyllum demersum , auxin , macrophyte , biology , stimulation , gibberellin , aquatic plant , botany , horticulture , ecology , endocrinology , biochemistry , gene
The season dependent changes in growth response to treatment with auxin or gibberellin were studied in the aquatic macrophyte Ceratophyllum demersum . Control plants show, under experimental conditions, a maximum growth in length in February. In the same period most of the lateral buds appear. Growth of the lateral buds occurs later. IAA causes a stimulation of growth in length from late November or December until February, in concentrations of 10 −9 M and 10 −6 M . There is almost no stimulation of lateral bud formation by IAA, only a slight increase from late November until December occurs by the lowest concentrations used. The highest concentration used, 10 −4 M , is in most cases supraoptimal for lateral bud formation; only when plants become dormant (August), this high dose may stimulate the process. GA 3 , in concentrations of 10 −9 , 10 −6 or 10 −4 M , exhibits a dose dependent increase of the response with respect to growth in length and lateral bud formation. The response occurs earlier than that for IAA: already early in November, or December, until February. Growth of the lateral buds may show only a slight stimulation by IAA as well as GA in winter. From February until April all GA concentrations used could cause a small increase of the growth of sprouts. In the case of IAA, however, only the lowest concentration could cause a small increase.