Bhavana Gaur
Department of Botany,
R.G. (P.G.) College, Meerut–250001, India
E mail:gaurbhavana@yahoo.com
Abstract: Phaseolus vulgaris is an important pulse, belonging to family Fabaceae, is an important source of vegetarian diet. Due to its food value, its plants are cultivated from very ancient times. For cultivation of plants, the first and foremost come roots, which help in fixation of plants and in supplying water and minerals to developing plants. Root studies from physiological point of view are very important. Here physiological aspect of root development has been studied in juvenile seedlings of Phaseolus vulgaris and rooting behaviour is studied in light and in dark. The root starts with emergence of radicle, an indication of germination of seeds. During further studies on root growth, the roots take over a particular length. The root length has been recorded here. Differentiation of lateral roots is again an important part of root architecture. Whether lateral roots initiate early or late has been observed here. Lastly average number of lateral roots differentiated at a particular point of time has been observed here. Here rooting behaviour of roots of Phaseolus vulgaris has been studied covering all above mentioned aspects in light and dark. Studies started with emergence of radicle at the time of seed germination and rooting behaviour of juvenile seedlings of Phaseolus vulgaris was observed for 7 days in light and dark. Light promoted emergence of radicle, while dark promoted rest of the root activities i.e. root length, differentiation of lateral and average number of lateral roots.
Key words: Physiological aspects, Rooting behaviour, Root architecture, Juvenile seedlings, Radicle, Lateral root differentiation.
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