ISHS Acta Horticulturae 640: XXVI International Horticultural Congress: Viticulture - Living with Limitations
THE INFLUENCE OF PLANT GROWTH REGULATORS INCLUDED IN THE FORCING SOLUTION ON BUD BREAK OF DORMANT GRAPEVINES (VITIS SPP.) |
| Authors: | S. Gu, P.E. Read |
| Keywords: | grape, forcing solution, bud break, dormancy, PGRs |
| Abstract:
One-year old dormant canes of Vitis spp. Lacrosse (own-rooted) and Chambourcin (own-rooted and grafted to 3309 Couderc) in southeast Nebraska, USA were sampled in January, February, March, and November 2001 and January, March 2002 (two winters). Effects of basic forcing solution (2% sucrose and 200 ppm 8-hydroxyquinoline citrate) and additions of exogenous plant growth regulators (PGRs) abscisic acid (ABA), gibberellic acid (GA3), indole acetic acid (IAA), benzyladenine (BA) and their combinations on bud break of dormant vines were investigated. The days to bud break differed substantially across the months, whereby November > January > March, indicating that buds were more ready to break close to spring. The addition of plant growth regulators caused different responses. GA3 prolonged the days needed for bud break and ABA and IAA tended to shorten the number of days needed. BA had no effect on bud break timing. A combination of growth promoting hormones could possibly increase the rate of bud break, although treatment of IAA + BA + GA prolonged the time to bud break. There were significant differences between cultivars in January and March but differences were not seen in November, which indicates that grapevines are possibly at endodormancy in November and at Ecodormancy after January. The rootstock increased the bud break of dormant vines. Some linear or quadratic effects of PGRs on days to bud break were found. | |
Download Adobe Acrobat Reader (free software to read PDF files) | |
