Pomology Hort 310
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This 10 page Class Notes was uploaded by Rowena Rath on Thursday September 17, 2015. The Class Notes belongs to Hort 310 at Washington State University taught by Staff in Fall. Since its upload, it has received 10 views. For similar materials see /class/205948/hort-310-washington-state-university in Agricultural & Resource Econ at Washington State University.
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Date Created: 09/17/15
Flower Bud Formation JuvenHHy Physiological state when seedling trees cannot be induced to flower Reproductive phase achieved by increasing vegetative growth eg by nitrogen fertilizers y V Attributed to gibberellins 397 gt3 r39 produced by roots amp transported to buds 39 Antisense MdTFL1 gene overcomes JASHS 13174 Adllllr 7 Tramxuun Adult Vegetative Phase Mature physiological state in which reproductive phase depends on scion s precocity amp rootstock s floral inhibitors Delays reproductive phase Vigorous rootstock Excess N Gibberellin applications 1 Severe pruning Hastens reproductive phase Dwarfing rootstock v M Bending branch toward horizontal 39 Gibberellin inhibitors or ethylene Flower Bud Development Affected by both external environmental conditions amp internal physiological state 1 Induction biochemical signals CHOs N auxins gibberellins that induce a vegetative bud to become reproductive 2 Initiation when bud first becomes reproductive 3 Differentiation individual flower parts sepals petals stamens pistil form 4 Maturation growth of flower parts during winter 5 Anthesis opening of flowers or bloom in sp ng If M J Time of Flower Bud Initiation Apple Pear Sweet cherry Peach Apricot Plumprune midJune gt midJuly early July gt early August early July late June gt late July early August late June gt midAugust Apple Flower Bud Initiation X Depends on number of Bud scales Transition leaves True leaves Bracts Cultivars vary from 1822 total Bracts 3 True leaves rm Transition leaves 3 Budsculcs A King oucr primordial B Lateral lower primordia Apex domed 5eaf d 4Ieafbract pArImo1r Ia 39rimordia ug V ug15 King flower at apex Aug 21 Flower Parts Stamen anther filament Pistil stigma style ovary Petal Stigma jr 7 39 Anther lt d Style W L Filament l x Neitar Eecrelury r g ands
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