Changes in peroxidase and IAA oxidase activities during cell elongation in Phaseolus hypocotyls |
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Authors: | S B Bagatharia S V Chanda |
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Institution: | (1) Department of Biosciences, Saurashtra University, Rajkot, 360 005 Gujarat, India |
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Abstract: | Cytoplasmic and salt-extracted peroxidase and IAA oxidase activities were studied in Phaseolus vulgaris hypocotyls treated with gibberellic acid (GA, 200 μM), naphthyl acetic acid (NAA, 100 μM) and distilled water control (DW).
Peroxidase activity was assayed with four hydrogen donors during the initial phase of hypocotyl elongation. Though peroxidase
activity showed a decreasing trend with time in all the hydrogen donors studied; considerable variation with different hydrogen
donors was observed. NAA had maximum peroxidase activity as compared to DW or GA treatment. The activity showed a clear inverse
correlation with hypocotyl growth. IAA oxidase activity showed a similar trend with growth as peroxidase activity. A highly
significant correlation was observed between peroxidase and IAA oxidase activities and high molecular weight xyloglucan content
(P<0.001). Finally, the possible role of peroxidase and IAA oxidase activities in hypocotyl elongation growth is discussed. |
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Keywords: | peroxidase IAA oxidase gibberellic acid hypocotyl clongation Phaseolus vulgaris |
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