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Role of Gibberellic Acid in Plant Growth

Question:

Discuss about the Role of Gibberellic Acid in Plant Growth.

Answer:

Introduction:

The primary aim of this experiment is to study the effect of Gibberellic acid ( GA ) application on the growth of the plant (Paul, William, & John, 2010). For this purpose a group plants are set, one group is known as control plants and the other group is known as treatment plants. Here the controls are to be sprayed water whereas the treatment plants are to be sprayed Gibberellic Acid ( GA ). Here, in the two groups, each of the groups contains two pots with plants. In one group the dwarf plants are selected and in the other group the plants that are normal or tall are selected. Here pea plants i.e. Pisum Sativum are selected ("Gibberellic acid GA3 a potent plant growth regulator", 2016). It is hypothesised that the plants that will be treated with Gibberellic Acid ( GA ) will grow significantly than the plants that will be treated with water.

Methods:

Two healthy and complete seedlings are selected. In order to avoid any disturbance, the excess seedlings are removed very carefully. The pots with the plants are then labelled properly. The pots that are taken as the control are marked C and the plants which will be treated are named as T. Then the heights of the seedlings are measured. It can be done from a particular reference point or from the base. The point that is taken as preference must be marked or noted so that it can be identified easily. The heights are going to be measured in the next day must be measured from the same reference point. The pots that are named as T are treated with GA. The measurement must be 100 mg / litre. While spraying it must be taken care that no drifts can take place. The shoot apex and the leaves must be sprayed until droplets start to form. While spraying, the plants must be rotated properly so that it can be ensured that the entire plant is uniformly covered. The pots that contan the treated plants are placed in a large white tray. It is checked that the plants are properly marked or not.  Then the tray is taken to the glass house.

Results:

After the experiment and the data i.e. the results are written in a table format so that calculations can be done very easily. After each spray measurement is taken and written in the table. Four tables are made. One for dwarf plant that is treated with water and one for another dwarf plant that is treated with Gibberellic Acid ( GA ), whereas the remaining two table are for other two plants. One for tall plant that is treated with water and the other table is for the other tall plant that is treated with Gibberellic acid ( GA ). From the data in the table, the mean and variance are calculated. In case of the dwarf plant that is treated with Gibberellic acid ( GA ), the mean growth is found to be 30.2965 cm whereas the variance is calculated to be 273.1383. in case of the dwarf plant that is treated with water, the mean growth of plant is found to be 16.4895 cm whereas the variance is found to be 351.9259. on the other hand, in case of the tall plant that is treated with Gibberellic acid ( GA ), the mean growth of the plant is found to be 585.29 cm whereas the variance is found to be 5869070.47 and in case of the tall plant that is treated with water, the mean growth is found to be 401.59 cm and the variance is found to 2911361.6.

Discussion:

Hence, from the results of the above experiment, it can be stated that the plants that are treated with Gibberellic Acid ( GA ) experiences higher growth rate than the plants that are treated with water. It does not depend on the size or nature of the plant. It can be seen that in both cases i.e. in case of dwarf plant and also in case tall plants, the plants that are treated with Gibberellic Acid ( GA ) shows higher growth than the same plants that are treated with water. Hence, it can be said that the hypothesis that is taken in the starting of this experiment is true. i.e. the plants that are treated with Gibberellic acid do show higher growth than the similar plants that are treated with water.

References

Gibberellic acid GA3 a potent plant growth regulator. (2016). Triplantanol.com. Retrieved 31 August 2016, from http://www.triplantanol.com/gibb_acid_ga3.html

Paul, C., William, V., & John, W. (2010). Effects of Gibberellic Acid on Growth and Development of Plants of Various Genera and Species, 118(2).

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