Abstract
Poplar is an illustrious industrial woody plant with rapid growth, providing a range of materials, and having simple post-treatment. Various kinds of environmental stresses limit its output. Plant annexin (ANN) is a calcium-dependent phospholipid-binding protein involved in plant metabolism, growth and development, and cooperatively regulating drought resistance, salt tolerance, and various stress responses. However, the features of the PtANN gene family and different stress responses remain unknown in poplar. This study identified 12 PtANN genes in the P. trichocarpa whole-genome and PtANNs divided into three subfamilies based on the phylogenetic tree. The PtANNs clustered into the same clade shared similar gene structures and conserved motifs. The 12 PtANN genes were located in ten chromosomes, and segmental duplication events were illustrated as the main duplication method. Additionally, the PtANN4 homogenous with AtANN1 was detected localized in the cytoplasm and plasma membrane. In addition, expression levels of PtANNs were induced by multiple abiotic stresses, which indicated that PtANNs could widely participate in response to abiotic stress. These results revealed the molecular evolution of PtANNs and their profiles in response to abiotic stress.
Highlights
Plants may meet with adverse environments during their cycles of growth and development [1]
Cytosolic abscisic acid (ABA) signaling cascade is composed of pyrabactin resistance 1 (PYR1)/PYR1-like (PYL), protein phosphatase 2C (PP2C), and sucrose non-fermenting1-related protein kinase2 (SnRK2)
Proteins, and coding DNA sequences (CDS) annotation in P. trichocarpa were downloaded from the Phytozome database
Summary
Plants may meet with adverse environments during their cycles of growth and development [1]. The increasing frequency of extreme weather results in the aggravation of the adverse effects of abiotic stress on plants [2]. Due to plants suffering from low water tolerance, more water may be used to irrigate, which increases the burden on the environment. Plants can recognize and sense adverse environments during longterm evolution based on various signal transduction pathways, such as the abscisic acid (ABA) signal transduction pathway [3,4]. Integration of ABA and PYR/PYL can inhibit the PP2Cs, which leads to activating SnRK2.6 and initiating ion channels and expression of ABA-responsive genes [5,6]. ABA accumulation leads to activation of the Ca2+ channel in the plasma membrane and improved free Ca2+ concentration in plant cytoplasm in response to environmental stresses [7,8]
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