GA is a naturally occurring growth hormone that is absent or inactive in dwarfs

Ga is a naturally occurring growth hormone that is

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the dwarf variety. GA is a naturally occurring growth hormone that is absent or inactive in dwarfs due to a mutation that inhibits the last step of the biosynthetic pathway (Yaxley, 2001). The final step in forming biologically active hormones involves the synthesis of significant amounts GA 1 from GA 20 (Hedden, 1999). Because dwarf plants do not possess the particular enzyme 3- beta- hydroxylase responsible for this conversion there is a deficiency in the amount of giberellic acid produced (Hedden, 1999). Therefore once they have become treated with GA normal stem 0 5 10 15 20 25 30 35 GA Water Meandifferenceinseedlingheight(cm) Plant Treatment Tall Variety
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elongation and growth are restored allowing them to grow to a height similar to that of tall plants further enhancing how the absence of naturally occurring GA in dwarves prevents extensive growth. Because tall plants already possess GA in its natural form there was not a significant increase in their mean height in comparison to dwarves. This study could be improved by measuring the effects of GA on other parts of the plant as well as plant weight and leaf size. Gibberellins i.e. GA take part in several functions of the plant not solely for the promotion of seedling growth thus these different roles should be taken into consideration for both tall and dwarf pea plants to better understand the notable effects of GA. Reference List - Brian, P. (1959). Effects of Gibberellins on Plant Growth and Development. Biological Reviews, 34 (1), 37-77. . - Davies, P. (2010). Plant hormones. Dordrecht: Springer. - Hedden, P. (1999). Genetic Analysis of Gibberellin Biosynthesis. Plant Physiology, 119 (2), 365-370. . - Introduction to Phytohormones. (2010). The Plant Cell, 22 (3), tpc.110.tt0310-tpc.110.tt0310. . - Ladiges, P., Evans, B., & Saint, R. (2009). Biology . North Ryde, N.S.W.: McGraw-Hill. - Moore, T. (1979). Biochemistry and physiology of plant hormones . New York: Springer-Verlag. - Yaxley, J. (2001). Gibberellin Biosynthesis Mutations and Root Development in Pea. Plant Physiology, 125 (2), 627-633. .
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Appendix 1. Calculation of a t-test to compare mean growth of pea seedlings ( Pisum sativum ) with or without the treatment of GA.
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