| Title: | Photoperiodic Effects on the Emanation of Volatiles from Alfalfa (Medicago sativa L.) Florets |
| Address: | "Plant Science Research Division, Agricultural Research Service, United States Department of Agriculture, Bee Research Laboratory, Tucson, Arizona 85719" |
| ISSN/ISBN: | 0032-0889 (Print) 1532-2548 (Electronic) 0032-0889 (Linking) |
| Abstract: | "Alfalfa (Medicago sativa L.) plants acclimated to photoperiods of 18 hours light, 6 hour dark in plant growth chambers exhibited a daily cyclic pattern of floret volatile emanation with a maximum emanation of about 6.5 nanograms of hydrocarbons/floret.30 minutes. This maximum was reached about 6 to 8 hours into the light period. After 8 hours of light, emanation of volatiles decreased rapidly to less than 0.1 ng/floret.30 min even though light and temperature remained constant. Under continuous illumination, only a small increase of volatile emanation occurred during the following 24 hours. It appeared that a dark period was necessary to promote floret volatile emanation. Floret volatile emanation was drastically affected for at least 7 days following a photoperiod change. A photoperiod change caused 6-fold concentration oscillations every 2 hours. The results are interpreted on the basis of a very active floral metabolism controlled by photoperiodically induced rhythms" |
| Notes: | "PubMed-not-MEDLINELoper, G M Lapioli, A M eng 1972/05/01 Plant Physiol. 1972 May; 49(5):729-32. doi: 10.1104/pp.49.5.729" |
