Passion fruit, an economically valuable fruit crop, is highly vulnerable to adverse climate conditions. The genes, recognized as abscisic acid (ABA) and stress-inducible, play vital roles in stress response and growth regulation in diverse eukaryotic organisms. Here, six genes were firstly identified in passion fruit genome and all predicted to be localized within the endoplasmic reticulum. Phylogenetic analyses showed that all PeHVA22s were divided into four subgroups. The gene structural features of genes clustered in the same subgroup were relatively conserved, while the gene structure characteristics of from different subgroups varied significantly. and closely clustered with barley in Group II, were also induced by ABA and drought stress treatment, suggesting conserved roles similar to barley . Meanwhile, most exhibited induced expression post-drought treatment but were suppressed under salt, low and high-temperature conditions, indicating a unique role in drought response. Additionally, displayed tissue-specific expression patterns across diverse tissues, except for which maybe a pseudogene. Notably, , , and predominantly expressed in fruit, indicating their involvement in fruit development. Almost all showed variable expression at different developmental stages of stamens or ovules, implying their roles in passion fruit's sexual reproduction. The intricate roles of may result from diverse regulatory factors including transcription factors and CREs related to plant growth and development, hormone and stress responsiveness. These observations highlighted that might play conserved roles in ABA response and drought stress tolerance, and also be participated in the regulation of passion fruit growth and floral development.
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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10835403 | PMC |
http://dx.doi.org/10.3389/fpls.2023.1279001 | DOI Listing |
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