4 research outputs found
Farāred light promotes Botrytis cinerea disease development in tomato leaves via jasmonateādependent modulation of soluble sugars
Plants experience a decrease in the red:farāred light ratio (R:FR) when grown at high planting density. In addition to eliciting the shade avoidance response, low R:FR also enhances plant susceptibility to pathogens via modulation of defense hormoneāmediated responses. However, other mechanisms, also affected by low R:FR, have not been considered as potential components in FRāinduced susceptibility. Here, we identify FRāinduced accumulation of leaf soluble sugars as a novel component of FRāinduced susceptibility. We observed that phytochrome inactivation by FR or phytochrome B mutation was associated with elevated leaf glucose and fructose levels and enhanced disease severity caused by Botrytis cinerea. By experimentally manipulating internal leaf sugar levels, we found that the FRāinduced susceptibility in tomato was partly sugarādependent. Further analysis revealed that the observed sugar accumulation in supplemental FR occurred in a jasmonic acid (JA)ādependent manner, and the JA biosynthesis mutant def1 also displayed elevated soluble sugar levels, which was rescued by exogenous methyl jasmonate (MeJA) application. We propose that the reduced JA responsiveness under low R:FR promotes disease symptoms not only via dampened induction of defense responses, but also via increased levels of soluble sugars that supports pathogen growth in tomato leaves
Farāred light promotes Botrytis cinerea disease development in tomato leaves via jasmonateādependent modulation of soluble sugars
Plants experience a decrease in the red:farāred light ratio (R:FR) when grown at high planting density. In addition to eliciting the shade avoidance response, low R:FR also enhances plant susceptibility to pathogens via modulation of defense hormoneāmediated responses. However, other mechanisms, also affected by low R:FR, have not been considered as potential components in FRāinduced susceptibility. Here, we identify FRāinduced accumulation of leaf soluble sugars as a novel component of FRāinduced susceptibility. We observed that phytochrome inactivation by FR or phytochrome B mutation was associated with elevated leaf glucose and fructose levels and enhanced disease severity caused by Botrytis cinerea. By experimentally manipulating internal leaf sugar levels, we found that the FRāinduced susceptibility in tomato was partly sugarādependent. Further analysis revealed that the observed sugar accumulation in supplemental FR occurred in a jasmonic acid (JA)ādependent manner, and the JA biosynthesis mutant def1 also displayed elevated soluble sugar levels, which was rescued by exogenous methyl jasmonate (MeJA) application. We propose that the reduced JA responsiveness under low R:FR promotes disease symptoms not only via dampened induction of defense responses, but also via increased levels of soluble sugars that supports pathogen growth in tomato leaves