Abstract:
KEY MESSAGE:78 HD-Zip family genes in Phyllostachys edulis were analyzed. Overexpression of Phehdz1 can improve the drought tolerance of transgenic rice and affect its secondary metabolism. Many studies suggested homeodomain-leucine zipper (HD-Zip) transcription factors are important regulators of plant growth and development, signal transduction, and responses to environmental stresses. In this study, 78 moso bamboo (Phyllostachys edulis) HD-Zip genes were investigated and classified into four subfamilies (HD-Zip I-IV). Additionally, Phehdz1 (HD-Zip I gene) was isolated and confirmed to be highly expressed in the roots. A quantitative real-time PCR analysis indicated Phehdz1 expression was significantly induced by drought, high salinity, and abscisic acid (ABA). A transient expression assay proved that Phehdz1 was localized in the nucleus of tobacco cells. Moreover, it could bind to the core region encoded by the H-box sequence (CAATAATTG) in yeast. In response to mannitol treatments, the Phehdz1-overexpressing transgenic rice had a higher germination rate and longer shoots than the wild-type controls. Moreover, Phehdz1-overexpressing rice plants had a higher survival rate as well as higher relative water and proline contents, but a lower malondialdehyde content, than the WT plants after a 30% polyethylene glycol 6000 treatment. Accordingly, the overexpression of Phehdz1 enhances the drought tolerance of transgenic rice. Many of the differentially expressed genes identified by a transcriptome analysis are involved in MAPK signal transduction and the biosynthesis of secondary metabolites. Thus, the overexpression of Phehdz1 enhances the drought stress tolerance of transgenic rice, while also potentially modulating the expression of metabolism-related genes.
journal_name
Plant Cell Repjournal_title
Plant cell reportsauthors
Gao Y,Liu H,Zhang K,Li F,Wu M,Xiang Ydoi
10.1007/s00299-020-02625-wsubject
Has Abstractpub_date
2021-01-01 00:00:00pages
187-204issue
1eissn
0721-7714issn
1432-203Xpii
10.1007/s00299-020-02625-wjournal_volume
40pub_type
杂志文章abstract::In vitro clonal propagation of plants should generate identical copies of the selected genotype. However, associated stress might result in a breakdown of control mechanisms and consequent instability of the genome. We have used several molecular methods to assess the genetic stability of long-term propagated (24 year...
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