| Abstract Detail
Physiology Külen, Oktay [1], Stushnoff, Cecil [1], Davidson, RD [2], Holm, DG [2]. Effects of Growth Regulators on Minituber Bud Dormancy and Subsequent Tuber Yield. THE objectives of this study were to test the effects of plant growth regulators, abscisic acid (ABA), ethylene (Florel, Etherel), gibberellin (ProGibb), and the combination of ProGibb and Florel (Pro-Florel) on minituber bud dormancy release and sprout development, and their subsequent effects on field plant growth and yield of seed tubers. Potato minituber cultivars were categorized into three dormancy groups based on their dormancy duration; (1) short dormancy group (Silverton); (2) intermediate dormancy group (Russet Norkotah (RNK), Sangre Selection 14 (Sangre-S14) and Desiree) and (3) long dormancy group (Nooksack and Russet Norkotah Selection 3 (RNK-S3)). A combined Pro-Florel treatment was most effective in shortening potato minituber bud dormancy and improving tuber yield in the long dormancy group. In the long most recalcitrant dormancy cultivars, Pro-Florel treatments shortened dormancy more than 3 weeks, increased sprout number by 2.3 per minituber, and increased sprout length by 2.0 cm/minituber 5 weeks after treatment in the laboratory; increased plant height by 23.7 cm/plant 2 months after planting; increased seed tuber number by 0.6 per plant, and increased tuber yield by 0.6 kg/plot compared to untreated minitubers on average for 2002 and 2003. Pro-Florel treatment also significantly increased glucose and fructose levels during dormancy break in RNK-S3 minitubers. The laboratory protocol used in this study effectively estimated dormancy release and provided a good estimate of field response to the treatments used.
Log in to add this item to your schedule
1 - Colorado State University, Department of Horticulture & Landscape Architecture,, Fort Collins, CO, 80523, USA
2 - Colorado State University, Horticulture and Landscape Architecture, San Luis Valley Research Center, 0249 East Road 9 North, Center, CO, 81125, USA
Keywords:
minituber
Growth regulators
Dormancy
Florel
gibberellin.
Session: Poster-20
Location: Ballroom CD/Monona Terrace
Date: Tuesday, July 25th, 2006
Time: 8:00 AM
Abstract ID:364 |
