Development of flower buds in Pharbitis nil Choisy as influenced by various external conditions and growth substances
Year: 1994
Type: article
Abstract: The developmental stage of the flower buds of Pharbitis nil, cv, Violet was determined, and the effects of external conditions and exogenous gibberellin A₃ (GA₃) or abscisic acid (ABA) following a single flower-inducing dark period on their development were examined with axillary flower buds formed on the third node which were referred to as the first flower buds and with the terminal flower buds on the main stem. 1. The stage of development of the flower buds was represented by floral scores from 0 (vegetative bud) to 10 (petal unfurling). 2. Under continuous white-light of fluorescent lamps the first and terminal flower buds developed rapidly to the carpel initiation and carpel development, respectively. Thereafter, these flower buds hardly developed. The rate and pattern of development of these flower buds were not affected by the different lengths of the flower-inductive dark periods of 12-, 14- and 16-h, all of which caused the initiation of flower buds. 3. Exposure to short days caused both the first and terminal flower buds to develop further, where development of the formers preceded that of the latters. However, exposure to long days consisting of either continuous light or interruption of the dark period by light, inhibited or retarded the subsequent development of both the first and terminal flower buds, where development of the formers was retarded earlier than that of the latters. 4. The higher the light intensity, the more promoted the early development of both the first and terminal flower buds. 5. At 30℃ the first flower buds ceased their early development. The terminal flower buds reverted earlier to vegetative buds. At 20℃ both the flower buds continued to develop slowly later on. 6. Exogenous GA₃ promoted the early development of the terminal flower buds. However, ABA inhibited the early development of both the first and terminal flower buds. These findings are discussed in relation to development of the lower axillary and terminal flower buds.
Authors: Masahiro Maesaka, Yuka Ogawa
Language: English
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: green
OpenAlex ID: W2784581666