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TaCAP1 interacts with TaLHCB1s and positively regulates wheat resistance against stripe rust.
Phytopathology 2024 April 23
Actin filaments and their associated actin-binding proteins (ABPs) play key roles in plant innate immune signaling. CAP1, or cyclase-associated protein 1, is an important regulatory factor of the actin cytoskeleton-associated signaling network, and was hypothesized here to be involved in resistance against wheat stripe rust because TaCAP1 expression was up-regulated in response to Puccinia striiformis f. sp. tritici (Pst). Down regulation of TaCAP1 expression led to decreased resistance against Pst, in contrast to increased resistance upon TaCAP1 overexpressing, as demonstrated by the changes of phenotypes and hyphal growth. We found increased expression of pathogenesis-responsive or relative related genes and disease grade changed in TaCAP1 overexpressing plants. Our results also showed TaCAP1-regulated host resistance to Pst by inducing the production and accumulation of reactive oxygen species (ROS) and mediating the salicylic acid signaling pathway. Additionally, TaCAP1 interacted with chlorophyll a/b -binding proteins TaLHCB1.3 and TaLHCB1.4, also known as light-harvesting chlorophyll-protein complex II subunit B (LHCB), which belong to the light-harvesting complex II proteins family. Silencing of two TaLHCB1 genes showed higher susceptibility to Pst, which reduced wheat resistance against Pst. Therefore, the data presented herein further illuminate our understanding that TaCAP1 interacts with TaLHCB1s, and functions as a positive regulator of wheat resistance against the stripe rust.
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