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Chapter 24

BIOL 1010 Chapter 24: Topic 24.3

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University of Manitoba
Biological Sciences
BIOL 1010
Emily A.Mc Kinnon

R98729 Bio 1010 Gibberellins make the grapes grow farther apart in a cluster (which increases air flow an decreases rotting) and produces larger grapes, a trait desired by most shoppers. In nature, gibberellins in seeds are probably the link between environmentalcuesandthemetabolicprocessesthatrenewgrowthof the embryo. For example, when water becomes available to grass seed, it causes the embryo in the seed to release gibberellins, which promote germination by mobilizing nutrients stored within the seed. Insomeplants,gibberellinsseemtobeinteractingantagonisticallywith another hormone, abscisic acid. Abscisic acid inhibits many plant processes In 1960s, one research group studying bud dormancy and another team investigating leaf abscission (the dropping of autumn leaves) isolated the same compound, abscisic acid (ABA). Aba is no longer thought to play a primary role in either bud dormancy or leaf abscission (for which it was named), but it is a plant hormone of great importance in other functions. In contrast to the growth-stimulating – auxin, cytokinins and gibberellins – ABA slows growth. growth hormones that often determines the final outcome.is the ratio of ABA to one or more Seed dormancy is an evolutionary adaptation that ensures that a seel will germinate only when there are favourable conditions of light, temperature and moisture. o What prevents a seed dispersed in autumn from germinating immediately; only to be killed by winter? What prevents seeds from germinating in the dark, moist interior of fruit? High levels of ABA in maturing seeds inhibit germination.d during seed maturation.
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