Agricultural Communications Documentation Center, Funk Library, University of Illinois Document Number: C24671
Notes:
Pages 26-34 in Fedro S. Zazueta and Jiannong Xin (eds.), Computers in agriculture: proceedings of the 7th international conference on computers in agriculture, Orlando, Florida, October 26-30, 1998. St. Joseph, Michigan: American Society of Agricultural Engineers. 999 pages.
Rose, David C. (author), Sutherland, William J. (author), Parker, Caroline (author), Lobley, Matt (author), Winter, Michael (author), Morris, Carol (author), Twining, Susan (author), foulkes, Charles F. (author), Amano, Tatsuya (author), and Dicks, Lynn V. (author)
Format:
Journal article
Publication Date:
2016-11
Published:
United Kingdom
Location:
Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 159 Document Number: D07672
4 pages, via Online journal, Bougainvillea (Bougainvillea sp.) plant inflorescence number will vary in response to multiple cues such as changes in temperature, water, light intensity, pruning, and photoperiod. Previous research reports that the application of plant growth regulators (PGRs) to bougainvillea grown under varying photoperiods improved inflorescence number, probably as a result of changes in gibberellic acid (GA) levels. There are many bioactive plant GAs, but we chose to investigate differences in gibberellic acid 3 (GA3) levels and inflorescence number in response to the application of ethephon (2-cholorethylphosponic acid) or abscisic acid (ABA) to ‘Afterglow’ bougainvillea (Bougainvillea ×buttiana) grown under 14-hour photoperiod [long-day (LD)] conditions. Plants were 5 inches tall with seven visible lateral nodes and were grown in a greenhouse in 4-inch pots filled with 5-mm coarse aquarium zeolite. Ethephon was applied as a foliar spray at 0.05, 0.07, 0.10, 0.15, or 0.20 mg/plant. ABA was applied as a soil drench at 1, 1.5, 3, 6, 8, or 10 mg/plant. Endogenous levels of GA3 were measured 1 and 48 days after treatment to calculate the change in GA3 (∆GA3). A short day (SD) control of 8 hours was included to measure differences in inflorescence number and ∆GA3 between photoperiods. ‘Afterglow’ plants grown under SD conditions had the greatest decrease in ∆GA3 (–1.09 µg·g–1) over 48 days and the most inflorescences (10.6) compared with LD control plants with a decrease in ∆GA3 of –0.09 µg·g–1 and fewer inflorescences (1.0). Plants grown under LD conditions and treated with 0.05 mg/plant ethephon had inflorescence numbers (9.6) and levels of ∆GA3 (–0.74 µg·g–1) similar to the SD control. As ethephon rate increased to more than 0.05 mg/plant, inflorescence number on LD plants decreased and ∆GA3 increased. Exogenous ABA rates of 1 mg/plant produced inflorescence numbers (1.4) and ∆GA3 (–0.10 µg·g–1) similar to the LD control. As the rate increased, ∆GA3 increased and inflorescence number decreased. Plants treated with ABA rates of 3 mg/plant and more were defoliated and had no inflorescences.
Agricultural Communications Documentation Center, Funk Library, University of Illinois Box: 131 Document Number: D11317
Notes:
6 pages., Pages 37-42 in 27th annual meeting of the Caribbean Food Crops Society. Dominica, Volume 27., Authors recall some aspects of agricultural information before analyzing the problems of this information sector, the importance of which sometimes is unrecognized by agricultural administrators, researchers, extensionists, and producers. Perspectives for the development and better management and use of information resources are proposed through the use of new information technologies (databases, microcomputers, software, agricultural thesauruses, CD-ROMs, etc.), networks, and the sharing of resources through cooperation at local, regional, and international levels."
