Link to home

Cannot retrieve the URL specified in the Content Link property. For more assistance, contact your site administrator.

Infection of blueberries by Colletotrichum acutatum: Host defenses, inheritance of resistance, and environmental effects.
T. D. MILES (1), A. C. Schilder (1). (1) Michigan State University, East Lansing, MI, U.S.A.

A disease forecasting model for anthracnose fruit rot in blueberries was developed based on temperature, wetness duration, relative humidity, and wetness interruptions. The resistance response in the blueberry cultivar ‘Elliott’ was also investigated using suppression subtraction hybridization and several defense-related genes as well as abiotic stress-related genes were found to be upregulated in ‘Elliott’. Some genes were related to oxidative stress and higher levels of hydrogen peroxide were found. Chemical fruit extractions were performed in ‘Elliott’ (resistant) and ‘Jersey’ (susceptible), and the methanolic extract was the most biologically active. Anthocyanins and flavonols were then quantified and identified in both cultivars using HPLC-MS. ‘Elliott’ fruit contained more anthocyanins than ‘Jersey’ fruit but the same compounds were found in both cultivars. However, two unique flavonols were present in ‘Elliott’. A total of 26 blueberry cultivars were screened for anthracnose resistance using several different techniques. A cut-fruit technique was promising as a rapid screening method. Resistance was positively correlated with fruit sugar content but not fruit pH. The inheritance of resistance was also investigated by inoculating fruit from F-1 populations of specific crosses between resistant and susceptible cultivars; resistance ratings based on disease incidence were highly correlated with resistance ratings predicted from previous studies.<p><p>Keywords:

View Presentation