Effect of charcoal rot on selected putative drought tolerant soybean genotypes and yield

• DOI: 10.1016/j.cropro.2017.11.012
• Publication Date: 2017-12-07T15:35:19Z
• Authors: Alemu Mengistu; Jeffery D. Ray; James R. Smith; Prakash R. Arelli; Nacer Bellaloui; Pengyin Chen; Grover Shannon; Debbie Boykin
• Keywords: Macrophomina phaseolina; Charcoal; Drought Tolerance

Charcoal rot (CR), caused by the fungus Macrophomina phaseolina (Tassi) Goid. is a pervasive disease of economic significance on soybeans (Glycine max (L.) Merr.). Similarly, drought leading cause yield loss in soybean worldwide. In this study, CR severity and seed were determined irrigated non-irrigated environments 2011, 2012, 2013 for thirteen genotypes, nine which previously to be tolerant (DT). The objectives determine putative DT genotypes over-all effect environments. Colony Forming Units (CFUs) at reproductive stage R7 used assess classify each genotype's response CR. A stress tolerance index (STI) was relative impact soil moisture (i.e. no irrigation) 13 genotypes. Over all three years both environments, five consistently rated as moderately resistant (MRCR) susceptible (SCR), whereas responses remaining varied between MRCR SCR. Averaged over years, there wide range (0.36–1.09) STI values among Even though consistent trend, very weak relationship CFU's growth stage. Regression analysis indicated that CFUs increased, decreased, although not significant every year irrigation environment. Nonetheless, across pooled (global) slope 11.5 kg ha−1 1000 R7. These data decreased However, minimal, it may necessary select resistance traits using where are high.