Characteristics Of Axial Development In Arabidopsis Thaliana

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In Arabidopsis thaliana and all flowering plants, one of the most characteristic features of development is axial development. There is a gradient in terms of age along the axial structure, as there are active meristematic tissues at the apices of the shoot and root. These apical meristems divide continuously to establish the basic patterns of new organs and tissues. There are also lateral primordia, which start to develop when environmental conditions become favourable for the growth of lateral tissues. The main axial structure of a plant is its shoot system, which is a stack of unit segments, each composed of an internode with a leaf and a bud. The unit segment is called a phytomer(Evans, 1940). The ontogeny and morphology of shoots represent the most fundamental aspectsof axial development. Shoot systems are divided developmentally into two stages, vegetative and reproductive. The vegetative shoot system encompasses leaves, stems, and buds. The reproductive shoot system is called the inflorescence and is involved in the formation of leaves, flower stalks and flowers. On the basis of their ontogeny, inflorescences of plants are categorized as determinate and indeterminate (Weberling, 1989). The arrangement of components can be expected to be under genetic control and to be susceptible to environmental conditions (Hilu, 1983; Marx, 1983). We are interested in identifying genetic tools with whichto analyzedifferent kind of factors influenced mutational studies in

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