Effect of trace elements Zn, B, Mg and Cu on the growth and sporulation of Pyricularia oryzae, the causal organism of blast disease of rice

Abstract

Blast is one of the most common disease of the Rice crop caused by Pyricularia oryzae. Blast of Rice is a recurrent problem of Rice producing countries declines productivity drastically. Mycelium growth and sporulation of P. oryzae is depend upon many factors i.e. humidity, temperature, availability of nutrients etc. Like other fungi P. oryzae also requires some nutrients in very minute quantity for their physiological and metabolic activities. Regulating these micronutrients or trace elements we can control the growth and spore production in P. oryzae. In this paper, we studied effect of four trace elements i.e. Zinc (Zn), Boron (B), Magnesium (Mg) and Copper (Cu) on growth and sporulation of P. oryzae. Zinc, Boron and Copper are most effective and promote growth and sporulation at 2 ppm (parts per million) concentration when we increased concentration of these elements in the medium, growth and sporulation decreased .On the other hand less growth and sporulation reported in the absence of Magnesium. Minute quantity of Magnesium is required for optimum growth i.e. 2 ppm. after this increasing concentration of Magnesium is not significant.

Effects of Trace Elements and Antimycotics to Manage Rice Blast Disease Caused by Pyricularia oryzae

“…Mechanism of boron, zinc and copper behind suppression of P. oryzae remains ambiguous, however, it has been thought that they might interfere with the spore production or metabolism (Nadeem et al, 2018). Concentration of boron, zinc, copper and magnesium at 2 ppm promoted growth and sporulation of P. oryzae, however at greater concentration the growth and sporulation found to be decreased (Sharma and Shukla, 2020). The results of this study endorse the results of Nadeem et al (2018).…”

<i>In Vitro</i> Efficacy of Botanicals against Rice Blast Pathogen <i>Magnaporthe oryzae oryzae</i>

“…Our result was accordance with [30] who studied on a satisfactory potential of turmeric as a natural pesticide for possible use in crop protection and thus a highly promising future towards this direction, that is, the possibility of effective control of certain pests of agricultural importance with the use of turmeric products as a cheap and more environment friendly alternative to chemical pesticides already used for the same purpose. Essential oils and oleoresin from Piper nigrum, Coriander sativum and Curcuma domestica were isolated and tested for their effect on Magnaporthe oryzae in rice [31].…”

Journal of Plant Protection Research

“…Pyricularia oryzae (anamorph: Magnaphorte oryzae) is one of the most destructive pathogens in rice fields, causing blast disease that attacks rice plants in vegetative and generative growth phases. Rice blast disease attacked 1.285 million ha or 12% of all rice fields in Indonesia (Kharisma et al 2013) and can cause yield losses of up to 90% on susceptible rice and 40-70% in India, the Philippines, and Nigeria (Sukanya et al 2011). In a conducive environment, leaf blast can quickly develop and cause the death of rice plants, while neck blast causes crop failure and disease spreading by rice seeds.…”