Abstract
Plants modify their internal states to adapt to environmental stresses. Under environmental stress conditions, plants restrict their growth and development and activate defense responses. Abscisic acid (ABA) is a major phytohormone that plays a crucial role in the osmotic stress response. In osmotic stress adaptation, plants regulate stomatal closure, osmoprotectant production, and gene expression. Here, we isolated CaPRR2 – encoding a pseudo response regulator protein – from the leaves of pepper plants (Capsicum annuum). After exposure to ABA and environmental stresses, such as drought and salt stresses, CaPRR2 expression in pepper leaves was significantly altered. Under drought and salt stress conditions, CaPRR2-silenced pepper plants exhibited enhanced osmotic stress tolerance, characterized by an enhanced ABA-induced stomatal closing and high MDA and proline contents, compared to the control pepper plants. Taken together, our data indicate that CaPRR2 negatively regulates osmotic stress tolerance.
Highlights
Plants are sessile organisms; they develop stress response mechanisms to adapt to various environmental stresses
Of the Arabidopsis PRR (APRR), it has been suggested that APRR2 may be associated with plant responses to abiotic stress, such as salt and drought, based on the interaction with calmodulin-like protein 9 (CML9) (Perochon et al, 2010)
The CaPRR2 gene consists of a 1,674-bp open reading frame, encoding 557 amino acid residues with an isoelectric point of 6.17 and a molecular weight of 61.81 kDa
Summary
Plants are sessile organisms; they develop stress response mechanisms to adapt to various environmental stresses Osmotic stresses, such as drought and salinity, disrupt homeostasis and cause functional and structural damage to proteins, resulting in fatal injury to cells (Wang et al, 2003; Golldack et al, 2014; Zhao et al, 2021). Plants enhance their osmotic tolerance by adjusting physiological and molecular processes, such as osmotic adjustment and antioxidant production, in response to stress conditions (Ma et al, 2020). Osmotic adjustment via organic solutes occurs through the synthesis and accumulation of organic solutes in the
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