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Unformatted text preview: GA on dwarf tomato Gibberellins are important to breaking dormancy after imbibition of water by the seed coat. Gibberellins signal germination activities. Application of gibberellins to seeds will counter the normal environmental cues, such as exposure to low temperatures. Gibberellins stimulate synthesis of enzymes that convert stored nutrients (starches) to sugars needed for rapid cell respiration during germination. Gibberellins secreted by embryos at the start of germination (imbibition of water) typically activate a set of genes found in the aleurone layer of seeds for this conversion. The malting industry uses gibberellins to enhance the barley's starch reserves conversion to malt and then to glucose. Abscisic acid can counter the effect of gibberllin to keep seeds dormant....
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- Fall '09