iTRAQ Based Protein Profile Analysis Revealed Key Proteins Involved in Regulation of Drought-Tolerance During Seed Germination in Adzuki Bean
Abstract Adzuki bean is famous as its high-quality protein, fiber, vitamins, minerals as well as rich bioactive substances. However, it is vulnerable to drought at the germination stage. Up to date, little information is available about the genetic controls of drought tolerance during seed germination in adzuki bean. In this study, differential expression proteins(DEPs)were identified based on iTRAQ technology during seed germination between the drought-tolerant variety 17235 and drought-sensitive variety 17033 in adzuki bean. A total of 2834 proteins were identified in the two adzuki bean in the germinating seeds. Eighty-seven and eighty DEPs were increased and decreased accumulation in variety 17235 compared to 17033 under drought, respectively. Meanwhile, 132/205 and 144/123 DEPs were up- or down-regulated in 17235 and 17033 under drought compared to the control, respectively. GO, KEGG, and PPI analysis revealed that the proteins related to carbohydrate metabolism and energy production showed abundantly increase in response to drought stresses. Ectopic overexpression of one candidate encoding V-ATPase in tobacco enhanced the drought tolerance of plants. The results provide valuable insights into adzuki bean response to drought stress, and the DEPs might be applied to develop drought tolerant adzuki bean in breeding programs.