Salt Stress Responses of Different Rice Varieties at Panicle Initiation: Agronomic Traits, Photosynthesis, and Antioxidants
The utilization of saline–alkali land for rice cultivation is critical for global food security. However, most existing studies on rice salt tolerance focus on the seedling stage, with limited insights into tolerance mechanisms during reproductive growth, particularly at the panicle initiation stage...
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MDPI AG
2025-07-01
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| author | Yusheng Li Yuxiang Xue Zhuangzhuang Guan Zhenhang Wang Daijie Hou Tingcheng Zhao Xutong Lu Yucheng Qi Yanbo Hao Jinqi Liu Lin Li Haider Sultan Xiayu Guo Zhiyong Ai Aibin He |
| author_facet | Yusheng Li Yuxiang Xue Zhuangzhuang Guan Zhenhang Wang Daijie Hou Tingcheng Zhao Xutong Lu Yucheng Qi Yanbo Hao Jinqi Liu Lin Li Haider Sultan Xiayu Guo Zhiyong Ai Aibin He |
| author_sort | Yusheng Li |
| collection | DOAJ |
| description | The utilization of saline–alkali land for rice cultivation is critical for global food security. However, most existing studies on rice salt tolerance focus on the seedling stage, with limited insights into tolerance mechanisms during reproductive growth, particularly at the panicle initiation stage (PI). Leveraging precision salinity-control facilities, this study imposed four salt stress gradients (0, 3, 5, and 7‰) to dissect the differential response mechanisms of six rice varieties (YXYZ: Yuxiangyouzhan, JLY3261: Jingliangyou3261, SLY91: Shuangliangyou91, SLY138: Shuangliangyou138, HLYYHSM: Hualiangyouyuehesimiao, and SLY11:Shuangliangyou111) during PI. The results revealed that increasing salinity significantly reduced tiller number (13.14–68.04%), leaf area index (18.58–57.99%), canopy light interception rate (11.91–44.08%), and net photosynthetic rate (2.63–52.42%) (<i>p</i> < 0.001), accompanied by reactive oxygen species (ROS)-induced membrane lipid peroxidation. Integrative analysis of field phenotypic and physiological indices revealed distinct adaptation strategies: JLY3261 rapidly activated antioxidant enzymes under 3‰ salinity, alleviating lipid peroxidation (no significant difference in H<sub>2</sub>O<sub>2</sub> or malondialdehyde content compared to 0‰ salinity) and maintaining tillering and aboveground biomass. SLY91 tolerated 7‰ salinity via CAT/POD-mediated lipid peroxide degradation, with H<sub>2</sub>O<sub>2</sub> and malondialdehyde contents increasing initially but decreasing with escalating stress. These findings highlight genotype-specific antioxidant strategies underlying salt-tolerance mechanisms and the critical need for integrating phenomics–physiological assessments at reproductive stages into salt-tolerance breeding pipelines. |
| format | Article |
| id | doaj-art-5464c9f68dae478ca1b5394e0dd739b6 |
| institution | DOAJ |
| issn | 2223-7747 |
| language | English |
| publishDate | 2025-07-01 |
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| series | Plants |
| spelling | doaj-art-5464c9f68dae478ca1b5394e0dd739b62025-08-20T03:02:58ZengMDPI AGPlants2223-77472025-07-011415227810.3390/plants14152278Salt Stress Responses of Different Rice Varieties at Panicle Initiation: Agronomic Traits, Photosynthesis, and AntioxidantsYusheng Li0Yuxiang Xue1Zhuangzhuang Guan2Zhenhang Wang3Daijie Hou4Tingcheng Zhao5Xutong Lu6Yucheng Qi7Yanbo Hao8Jinqi Liu9Lin Li10Haider Sultan11Xiayu Guo12Zhiyong Ai13Aibin He14School of Breeding and Multiplication (Sanya Institute of Breeding and Multiplication), Hainan University, Sanya 572000, ChinaSchool of Breeding and Multiplication (Sanya Institute of Breeding and Multiplication), Hainan University, Sanya 572000, ChinaSchool of Breeding and Multiplication (Sanya Institute of Breeding and Multiplication), Hainan University, Sanya 572000, ChinaSchool of Breeding and Multiplication (Sanya Institute of Breeding and Multiplication), Hainan University, Sanya 572000, ChinaCollege of Environment and Ecology, Hunan Agricultural University, Changsha 410128, ChinaSchool of Breeding and Multiplication (Sanya Institute of Breeding and Multiplication), Hainan University, Sanya 572000, ChinaSchool of Breeding and Multiplication (Sanya Institute of Breeding and Multiplication), Hainan University, Sanya 572000, ChinaSchool of Breeding and Multiplication (Sanya Institute of Breeding and Multiplication), Hainan University, Sanya 572000, ChinaSchool of Breeding and Multiplication (Sanya Institute of Breeding and Multiplication), Hainan University, Sanya 572000, ChinaSchool of Breeding and Multiplication (Sanya Institute of Breeding and Multiplication), Hainan University, Sanya 572000, ChinaNational Innovation Center of Saline-Alkali Tolerant Rice in Sanya, Sanya 572000, ChinaSchool of Breeding and Multiplication (Sanya Institute of Breeding and Multiplication), Hainan University, Sanya 572000, ChinaNational Innovation Center of Saline-Alkali Tolerant Rice in Sanya, Sanya 572000, ChinaNational Innovation Center of Saline-Alkali Tolerant Rice in Sanya, Sanya 572000, ChinaNational Innovation Center of Saline-Alkali Tolerant Rice in Sanya, Sanya 572000, ChinaThe utilization of saline–alkali land for rice cultivation is critical for global food security. However, most existing studies on rice salt tolerance focus on the seedling stage, with limited insights into tolerance mechanisms during reproductive growth, particularly at the panicle initiation stage (PI). Leveraging precision salinity-control facilities, this study imposed four salt stress gradients (0, 3, 5, and 7‰) to dissect the differential response mechanisms of six rice varieties (YXYZ: Yuxiangyouzhan, JLY3261: Jingliangyou3261, SLY91: Shuangliangyou91, SLY138: Shuangliangyou138, HLYYHSM: Hualiangyouyuehesimiao, and SLY11:Shuangliangyou111) during PI. The results revealed that increasing salinity significantly reduced tiller number (13.14–68.04%), leaf area index (18.58–57.99%), canopy light interception rate (11.91–44.08%), and net photosynthetic rate (2.63–52.42%) (<i>p</i> < 0.001), accompanied by reactive oxygen species (ROS)-induced membrane lipid peroxidation. Integrative analysis of field phenotypic and physiological indices revealed distinct adaptation strategies: JLY3261 rapidly activated antioxidant enzymes under 3‰ salinity, alleviating lipid peroxidation (no significant difference in H<sub>2</sub>O<sub>2</sub> or malondialdehyde content compared to 0‰ salinity) and maintaining tillering and aboveground biomass. SLY91 tolerated 7‰ salinity via CAT/POD-mediated lipid peroxide degradation, with H<sub>2</sub>O<sub>2</sub> and malondialdehyde contents increasing initially but decreasing with escalating stress. These findings highlight genotype-specific antioxidant strategies underlying salt-tolerance mechanisms and the critical need for integrating phenomics–physiological assessments at reproductive stages into salt-tolerance breeding pipelines.https://www.mdpi.com/2223-7747/14/15/2278rice salt tolerancepanicle initiation stagedifferential responseagronomic traitsantioxidant levelsphysiological adaptation |
| spellingShingle | Yusheng Li Yuxiang Xue Zhuangzhuang Guan Zhenhang Wang Daijie Hou Tingcheng Zhao Xutong Lu Yucheng Qi Yanbo Hao Jinqi Liu Lin Li Haider Sultan Xiayu Guo Zhiyong Ai Aibin He Salt Stress Responses of Different Rice Varieties at Panicle Initiation: Agronomic Traits, Photosynthesis, and Antioxidants Plants rice salt tolerance panicle initiation stage differential response agronomic traits antioxidant levels physiological adaptation |
| title | Salt Stress Responses of Different Rice Varieties at Panicle Initiation: Agronomic Traits, Photosynthesis, and Antioxidants |
| title_full | Salt Stress Responses of Different Rice Varieties at Panicle Initiation: Agronomic Traits, Photosynthesis, and Antioxidants |
| title_fullStr | Salt Stress Responses of Different Rice Varieties at Panicle Initiation: Agronomic Traits, Photosynthesis, and Antioxidants |
| title_full_unstemmed | Salt Stress Responses of Different Rice Varieties at Panicle Initiation: Agronomic Traits, Photosynthesis, and Antioxidants |
| title_short | Salt Stress Responses of Different Rice Varieties at Panicle Initiation: Agronomic Traits, Photosynthesis, and Antioxidants |
| title_sort | salt stress responses of different rice varieties at panicle initiation agronomic traits photosynthesis and antioxidants |
| topic | rice salt tolerance panicle initiation stage differential response agronomic traits antioxidant levels physiological adaptation |
| url | https://www.mdpi.com/2223-7747/14/15/2278 |
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