The present work highlights some preliminary observations on metabolism in rice (Oryza sativa Linn.) when an aquatic fern Azolla pinnata R.Br. was co-cultured under 2,4-Dichlorophenoxy acetic acid toxicity. We have observed the effects of Azolla in both fresh and dried forms. This work signifies the possible physiological changes of a crop plant by using Azolla as a bioremediator. In brief the herbicide 2,4-D is considered as stressor to rice plants and by applying the fresh and dried Azolla we investigate the changes occurred. The activities of different nitrogen metabolizing enzymes and reactive oxygen species were observed. On the other hand chlorophyll and carotenoids synthesis were retrieved by addition of fresh and dried Azolla mass over 2,4-D toxicity. Thus, the efficiency of fresh and dried Azolla mass was evaluated under herbicidal toxicity in rice. We evaluate the bio remediating role of Azolla plants against 2,4-D stress and conclude this species would also be supporting in supplementation of major nutrients to rice plants.
Keywords: Aquatic fern; Azolla; Herbicide; Nitrogen metabolism; Reactive oxygen species; Rice.