Musa Ibrahim Saheed; Ikhajiagbe Beckley; Geoffrey O. Anoliefo; Alexander O. Orukpe
Abstract
The Earth has become increasingly overcrowded as a result of rapid urbanization and population growth, with strong predictions that its carrying capacity could be overstretched soon. As a result, it is important to test the possibilities of growing plants under space exploration conditions, especially ...
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The Earth has become increasingly overcrowded as a result of rapid urbanization and population growth, with strong predictions that its carrying capacity could be overstretched soon. As a result, it is important to test the possibilities of growing plants under space exploration conditions, especially gravitational balance. Since microgravity impedes plant development, it is important to evaluate the extents by which plant growth stimulators can reverse or enhance this trend. A total of 12 maize seeds were weighed and placed sideways in petri dishes and inoculated with plant growth stimulators, indole acetic acid (IAA), gibberellic acid (GA), and ascorbate (AA). They were clinorotated at different rates (0.5, 1.0, and 2.0 rpm), while the control seeds were just placed on a balanced table. Results of this research showed that under microgravity, the maize seeds had a decreased level of germination percentage with increasing clinorotation rates at 72 hrs, compared to the control group. But when stimulated with IAA, GA and AA, they improved in germination percentage, compared to the control, even under microgravity conditions. The seedling dry weight, germination time and other germination parameters also showed similar improvements. Comparatively, the three growth stimulators showed no major variations in their ability to improve germination percentage under micro-gravitational impact. However, IAA caused more improvements in seedling vigor, compared to the other growth regulators, while GA had more effects on the rate of germination. This research confirmed the possibilities of improving germinability in maize seeds under space exploration conditions.
Pratima Bagale; Srijana Pandey; Pradip Regmi; Subhekchhya Bhusal
Abstract
This review provides a comprehensive overview of the basic and applied aspects of gibberellins (GAs) and its application in the regulation of growth and development of different vegetable crops. Plant growth regulators are the substances which are synthesized in particular cells and are transferred to ...
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This review provides a comprehensive overview of the basic and applied aspects of gibberellins (GAs) and its application in the regulation of growth and development of different vegetable crops. Plant growth regulators are the substances which are synthesized in particular cells and are transferred to other cells where in extremely small quantities influence the developmental processes. The GAs are an important group of phytohormones which exert various effects on promotion and regulation of plant growth. Gibberellic acid (GA3) is a type of GA plant hormone, with great economical and industrial importance. GAs affect stem elongation, germination, elimination of dormancy, flowering, sex expression, flooding responses, enzyme induction and leaf and fruit senescence. Foliar application of GA3 has been shown to change the physiological and developmental processes, including plant vegetative growth, sex expression, yield, and yield components in different vegetable crops. This study aims to reveal the impacts of GAs on different aspect of crop production with special emphasis on vegetable crops. Furthermore, appropriate concentration for the applications of GA3 in vegetable crops would be discussed so that the use of such regulators is environmentally and toxicologically safe for both plants and the consumers.
