Lower Gibberellic Acid Concentration, Longer the Stem Elongation

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Lower Gibberellic Acid Concentration, Longer the Stem Elongation
Introduction:
Hormone technology used widely in horticulture and agriculture. Plant hormones are the chemical messengers that could regulate or stimulate the growth and development of plants [Gossett]. The five major classes of plant hormones are auxin, cytokinins, gibberellins, ethylene and abscisic acid.
Auxin can cause the loosing of cell wall and increase the synthesis of cell-wall material and protein. Then initiate the growth and development of root at the stem base. Cytokinins has the function that can affect the cell division and formation of shoot. It also work for then intermodal length and delay the senescence of tissues. Gibberellins are the hormones that can cause elongation of stem. Abstisic acid is the plant growth regulator that produced in leaf and alternate leaves into bud covers. Ethylene can cause the rapidly growing of the dividing cells especially in the darkness. It also inhibit the expansion of leaf and elongation of stem. Ethylene cause thicker stem and allow the ripening of fruit.
This lab, our group designed a experiment to observe the effect of concentration of GA on the length of stems. According to our discussion, higher concentration of GA will cause more elongation of stem.

Hypothesis: Higher concentration of Gibberellic acid grew longer stem.

Methods:
Week 1 - Two-week-old bush bean plants were obtained and labeled by small flags with 0.04%, 0.2%, 1.0% and O%. The original lengths of stems were measured from the surface of soil to the top of the SAM in the unit of centimeter. After the measurement, three different spray bottles containing 0.04%, 0.2% and 1.0% of GA were pumped twice on respective two-week-old bush bean plants. Two sprays of distilled water were treated as a control and pumped on the 0% plant. All of the solutions and distilled water were…...

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