Year: 1996
Type: article
Abstract: The response of `Bright Golden Anne' chrysanthemum plants grown under CuSO 4 spectral filters to exogenous GA 3 application was evaluated to determine the relationship between gibberellins (GAs) and carbohydrate levels. The CuSO 4 filters removed far red (FR) wavelengths of light and increased red: far red (R:FR), blue: far red (B:FR), blue: red (B:R) ratios, and phytochrome photoequilibrium (Ø) values of transmitted light compared to water (control) filter. Plant height, internode length, and leaf and stem dry weights were significantly reduced by light passing through CuSO 4 filters in spring and summer seasons. Weekly applications of exogenous GA 3 reversed the reduction in height and internode length induced by CuSO 4 filters. Plants grown under CuSO 4 filters responded more to exogenous GA 3 application with respect to height and internode length, suggesting that the sensitivity to GA was not lowered. Light passing through CuSO 4 filters reduced the carbohydrate levels, but the response varied with the season. Weekly GA 3 application increased the carbohydrate levels, but did not totally reverse the reduction in carbohydrate levels under the CuSO 4 filters. Although GA 3 application increased the carbohydrate levels partially in CuSO 4 filter-grown plants, the inhibition of GAs may not be solely responsible for reduction of carbohydrate levels under CuSO 4 filters, showing that exogenous GAs and carbohydrate levels are not well correlated under CuSO 4 spectral filters.
Source: HortScience
Authors: Venkat K. Reddy, Nihal C. Rajapakse
Language: English
Topic: Light effects on plants
Subfield: Plant Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: bronze
Funder: Texas AgriLife Research
OpenAlex ID: W1898157251