Bio 3465 - Lab 5 - Gibberellic acid _ Plant growth

Bio 3465 - Lab 5 - Gibberellic acid _ Plant growth - BIO...

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BIO 3465 – Plant Physiology Laboratory 5 EFFECT OF GIBBERELLIC ACID ON STEM GROWTH OF PEA PLANTS Goal : Growth regulators elicit a number of both stimulatory and inhibitory effects in the growth and development of plants. One notable effect of gibberellic acid is the promotion of stem elongation. In this laboratory exercise you will test the effect of application of gibberellic acid on the growth of dwarf and tall varieties of pea plants. From your results you would be able to decide what gibberellic acid related activity is defective in this mutant. INTRODUCTION Gibberellins (gibberellic acid) are another group of plant hormone that regulates many aspects of plant growth and development. The Gibberellic acid was first isolated from a fungus in the 1930s. In 1956 MacMillan isolated gibberellin from the seed of a bean plant. Today there are at least 136 different gibberellins that are known to occur in higher plants though not all these gibberellins are biologically active. Unlike auxin that is essential for plant survival, gibberellin is not essential for the survival of plants, but without it plants may exhibit very severe growth and developmental defects. Gibberellins are diterpenoids, and are synthesized from terpenoid pathway. All gibberellins have
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This note was uploaded on 11/09/2011 for the course BIO 101 taught by Professor Pesthy during the Fall '07 term at Texas State.

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Bio 3465 - Lab 5 - Gibberellic acid _ Plant growth - BIO...

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