Submitted to: Meeting Abstract
Publication Type: Abstract Only
Publication Acceptance Date: October 29, 2012
Publication Date: November 25, 2013
Citation: Fugate, K.K., Ferrareze, J.P., Bolton, M.D. 2013. Use of jasmonic acid and salicylic acid to inhibit growth of sugarbeet storage rot pathogens [abstract.] Journal of Sugar Beet Research. 50:51. Technical Abstract: Jasmonic acid (JA) and salicylic acid (SA) are endogenous plant hormones that induce native plant defense responses and provide protection against a wide range of diseases. Previously, JA, applied after harvest, was shown to protect sugarbeet roots against the storage pathogens, Botrytis cinerea, Penicillium claviforme, and Phoma betae by reducing severity of rot symptoms due to these pathogens by 51, 44, and 71%, respectively (Fugate et al., 2012, Postharvest Biol. Technol, 65:1-4). Research was conducted to determine the ability of SA to protect sugarbeet roots from these storage rot pathogens and to investigate the use of preharvest treatments of JA or methyl jasmonate (MeJA), a low cost derivative of JA, to reduce storage rot due to B. cinerea, P. claviforme, P. betae, or Fusarium graminearum. SA, applied after harvest at concentrations of 0.01 to 10 mM, had no effect on the severity of storage rot symptoms in roots obtained from healthy, unstressed plants after inoculation with B. cinerea, P. claviforme, and P. betae. However, when roots were obtained from water-stressed plants, 0.01 to 10 mM SA reduced the severity of rot symptoms due to B. cinerea by 49—58%, P. claviforme by 30—53%, and P. betae by 47—74%. The effect of JA or MeJA applied to foliage 7, 14, or 30 days prior to harvest at concentrations of 0.01 or 10 µM is also under investigation. Preliminary results suggest that preharvest treatments reduce storage rot severity, but are less effective than postharvest treatments.