Tobacco Embryogenesis
Introduction
Tobacco is considered as one of the most important cash crops due to its huge demand attributed to large cigarette use by people. The reasons behind embryogenesis is the dire need to create plant cultures or types which can be used in large scale commercial farming for sale in tobacco industries whose demand is increasing on a daily basis due to increase in the number of cigarette smokers. The process of studying the various tissue cultures via embryogenesis enables formation of firm conclusion as to the best conditions for maximum production and growth of the tobacco plant. Embryogenesis involves the development of an embryo and the process of facilitating the growth of the embryo. This enables studies on the different types of cultures of tobacco depending on their variability to enable commercial undertakings in the growth of the best types of tobacco by farmer for industrial use in making of cigarettes (Zhihong & Jiyang, 2008).
Materials and Methods
Various plant regulators were used resulting in various growth issues such as the number of leaves and the size of the plants. Benzyl Amino Purine (BAP), an artificial cytokinin was used to bring out the growth by the development of buds of the tobacco tissue culture. The growth promoted by BAP is in such a way that it enhances the cell division process. Cell division in embryogenesis occurs when the cell is under the interphase to the cytokinesis process when the cells divide into two. After formation of the two cells, the cells develop to form the various plant parts such as the buds, stems and roots. The use of 0.54nm NAA led to the development of more than 15 buds in the calluses and approximately two roots. BAP however contributed to stunted growth and damaged tissues of the plants. In cases where the tissues were worn out or old and with callus, the tissues redeveloped when the BAP was used as it enhanced growth at the point where the tissues were removed. This is because the levels of auxins were low to inhibit any kind of growth as the product inhibits any form of respiration of the kinase chemical within the plant.
The effect of BAP is considered at its lowest in the roots because of the presence of the auxin chemicals, which are attracted to the roots by the forces of gravity. Use of NAA and BAP led to the formation of numerous shoots in comparison to those, which used the TDZ synthetic. Use of huge amounts of NAA led to the stunted growth of shoots as well as the low numbers of shoots. On the other hand, use of TDZ in large amounts had appositive effect because it enhanced the growth at the callus points despite the growth being minimal at the callus points. In addition, the TDZ was ineffective at lower volumes because it did not influence growth at any at the callus points of the tissue cultures.
The use of TDZ was utterly effective when its use was combined with the NAA and the BAP synthetics leading to shoot growth and elongation. TDZ enhances propagation when used in moderation. In addition, it inhibits the morphogenic formation via a negative feedback formation. The negative response is aimed at hindering growth by increase and formation of more ethylene hormone, which reduces the effectiveness of the synthetic chemical. In general, it leads to stunted growth of the shoots roots and the stems because the stems formed are short and thick. In addition, the BAP and the NAA played a significant role in the negative effects of hormones coupled by the presence of auxins, which jostled for space within the plant system leading to stunted or inhibited growth in the tissues of the plants (Srivastava, 2002).
Results
The synthetic regulating chemicals used in their concentrations influenced the outcomes of the growth of the tissues. The most affected tissues with specific reference were the shoots and the roots because they are the points where the chemicals had a tendency to concentrate themselves.
Growth hormones had diverse effects on the shots as wells as the roots of the tissues cultures. This was because of high concentrations of growth hormones inhibit maximum growth of the roots whereas the high concentrations of hormones within the shoots contributed to high bud propagation. The naturally present auxins within the plant contributed to the inhibition of growth at the various plant tissues with specific reference to where the auxins are present such as the meristematic tips and buds, which were developed shoots. On the other hand, the moderate amounts of TDZ used on the tissues enabled the growth of the tissues, which was identical to the NAA and BAP mix (Klerk, Hall & George, 2007).
In addition, the simultaneous use of NAA and BAP proved to accrue the best results because it enabled the formation of approximately 256 shoots and eight plates of tissue cultures. The results achieved were because the two synthetic chemicals used enhanced the formation of the budding process to form, buds as the chemicals hindered the actions of the naturally occurring auxins in the various tissues of the cultures presented for study. The presence of the auxins enables regulation of the hormonal concentrations within the tissues thus promoting growth within the plant. In addition, the lack of the auxins can be translated to the unproportional growth or inhibition of the preferred growth of the various tissues. Furthermore, the presence of high amounts of the synthetic chemical TDZ, which enabled growth of shots without propagation of multiple shoot growth.
In conclusion, the chemicals used all had various effects on the growth of the tissues, which was furthermore influenced by the amounts, or levels of concentration of the chemicals used to control the growth of the tissues. High concentrations of the three chemicals, NAA, BAP and TDZ had negative effects in that they led to stunted growth of the tissues of the tobacco cultures.
References
Klerk G, Hall M & George E (2007). Plant Propagation by Tissue Culture 3rd Edition: Volume 1. The Background. New York: Springer
Srivastava L M (2002). Plant growth and development: hormones and environment. New York: Academic Press
Zhihong X & Jiayang L (2008). Biotechnology and Sustainable Agriculture and Beyond. Texas: Cengage Learning
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