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EFFECT OF AGING ON GROWTH AND FLOWERING OF THE TERMINAL BUD OF PHARBITIS NIL
Author(s) -
Owens Vivian,
Paolillo Dominick J.
Publication year - 1986
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.1537-2197.1986.tb12127.x
Subject(s) - pharbitis nil , biology , epicotyl , bud , horticulture , context (archaeology) , botany , photoperiodism , elongation , seedling , paleontology , materials science , ultimate tensile strength , metallurgy
The tendency of the terminal bud of Pharbitis nil to flower after one long night was studied in the context of growth changes occurring with aging. Seedlings were grown under constant light and temperature, selected for uniformity and subjected to a 16‐hr dark period at ages ranging from 3 to 14 days. A decline in percent terminals flowering was observed after day 6, to zero at day 10. Flowering of the terminal was obtained in some plants, thereafter. Floral index of development scored lower for terminals flowering on days 7–9 and 11–14 than on days 3–6. Loss of the tendency to flower was associated with a decline in rate of leaf production in the terminal bud and a change in rate of elongation of the epicotyl axis. The data lend support to a nutrient‐diversion hypothesis in the control of flowering in Pharbitis.