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Zhang Y, Yang H, Liu Y, Hou Q, Jian S, Deng S. Molecular cloning and characterization of a salt overly sensitive3 (SOS3) gene from the halophyte Pongamia. PLANT MOLECULAR BIOLOGY 2024; 114:57. [PMID: 38743266 DOI: 10.1007/s11103-024-01459-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2024] [Accepted: 04/25/2024] [Indexed: 05/16/2024]
Abstract
A high concentration of sodium (Na+) is the primary stressor for plants in high salinity environments. The Salt Overly Sensitive (SOS) pathway is one of the best-studied signal transduction pathways, which confers plants the ability to export too much Na+ out of the cells or translocate the cytoplasmic Na+ into the vacuole. In this study, the Salt Overly Sensitive3 (MpSOS3) gene from Pongamia (Millettia pinnata Syn. Pongamia pinnata), a semi-mangrove, was isolated and characterized. The MpSOS3 protein has canonical EF-hand motifs conserved in other calcium-binding proteins and an N-myristoylation signature sequence. The MpSOS3 gene was significantly induced by salt stress, especially in Pongamia roots. Expression of the wild-type MpSOS3 but not the mutated nonmyristoylated MpSOS3-G2A could rescue the salt-hypersensitive phenotype of the Arabidopsis sos3-1 mutant, which suggested the N-myristoylation signature sequence of MpSOS3 was required for MpSOS3 function in plant salt tolerance. Heterologous expression of MpSOS3 in Arabidopsis accumulated less H2O2, superoxide anion radical (O2-), and malondialdehyde (MDA) than wild-type plants, which enhanced the salt tolerance of transgenic Arabidopsis plants. Under salt stress, MpSOS3 transgenic plants accumulated a lower content of Na+ and a higher content of K+ than wild-type plants, which maintained a better K+/Na+ ratio in transgenic plants. Moreover, no development and growth discrepancies were observed in the MpSOS3 heterologous overexpression plants compared to wild-type plants. Our results demonstrated that the MpSOS3 pathway confers a conservative salt-tolerant role and provided a foundation for further study of the SOS pathway in Pongamia.
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Affiliation(s)
- Yi Zhang
- Key Laboratory of National Forestry and Grassland Administration on Plant Conservation and Utilization in Southern China, Guangdong Provincial Key Laboratory of Applied Botany and Xiaoliang Research Station for Tropical Coastal Ecosystems, Chinese Academy of Sciences, Guangzhou, 510650, China
- National Engineering Research Center of Navel Orange, Gannan Normal University, Ganzhou, 341000, China
| | - Heng Yang
- Key Laboratory of National Forestry and Grassland Administration on Plant Conservation and Utilization in Southern China, Guangdong Provincial Key Laboratory of Applied Botany and Xiaoliang Research Station for Tropical Coastal Ecosystems, Chinese Academy of Sciences, Guangzhou, 510650, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yujuan Liu
- Key Laboratory of National Forestry and Grassland Administration on Plant Conservation and Utilization in Southern China, Guangdong Provincial Key Laboratory of Applied Botany and Xiaoliang Research Station for Tropical Coastal Ecosystems, Chinese Academy of Sciences, Guangzhou, 510650, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Qiongzhao Hou
- Key Laboratory of National Forestry and Grassland Administration on Plant Conservation and Utilization in Southern China, Guangdong Provincial Key Laboratory of Applied Botany and Xiaoliang Research Station for Tropical Coastal Ecosystems, Chinese Academy of Sciences, Guangzhou, 510650, China
- University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Shuguang Jian
- CAS Engineering Laboratory for Vegetation Ecosystem Restoration on Islands and Coastal Zones & Guangdong Provincial Key Laboratory of Applied Botany, South China Botanical Garden, Chinese Academy of Sciences, Guangzhou, 510650, China
| | - Shulin Deng
- Key Laboratory of National Forestry and Grassland Administration on Plant Conservation and Utilization in Southern China, Guangdong Provincial Key Laboratory of Applied Botany and Xiaoliang Research Station for Tropical Coastal Ecosystems, Chinese Academy of Sciences, Guangzhou, 510650, China.
- National Engineering Research Center of Navel Orange, Gannan Normal University, Ganzhou, 341000, China.
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PIN3 from Liriodendron May Function in Inflorescence Development and Root Elongation. FORESTS 2022. [DOI: 10.3390/f13040568] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Auxin, the first discovered phytohormone, is important for the growth and development of plants through the establishment of homeostasis and asymmetry. Here, we cloned the auxin transporter gene PIN-FORMED3 (PIN3) from the valuable timber tree hybrid Liriodendron (Liriodendron chinense × Liriodendron tulipifera). The gene contained a complete open reading frame of 1917 bp that encoded 638 amino acids. Phylogenetic analysis indicated that LhPIN3 exhibited the highest sequence similarity to the PIN3 of Vitis vinifera. Quantitative real-time PCR analysis showed that LhPIN3 was broadly expressed across different tissues/organs of Liriodendron, with the highest expression level in the roots. Heterologous overexpression of LhPIN3 in Arabidopsis thaliana caused considerable phenotypic changes, such as the root length and number of flowers. Genetic complementation of Arabidopsis pin1 mutants by LhPIN3, driven by the cauliflower mosaic virus 35S promoter, fully restored the root length and number of flowers of the pin1 mutant. Overall, our findings reveal that LhPIN3 has similar capacities to regulate the root length and number of flowers of Arabidopsis with AtPIN1.
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