Screening of Rice (<i>Oryza sativa</i> L.) Genotypes for Salinity Tolerance and Dissecting Determinants of Tolerance Mechanism
Soil salinity imposes osmotic, ionic, and oxidative stresses on plants, resulting in growth inhibition, developmental changes, metabolic adaptations, and ion sequestration or exclusion. Identifying salinity-tolerant resources and understanding physiological and molecular mechanisms of salinity toler...
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| Format: | Article |
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MDPI AG
2024-04-01
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| Series: | Plants |
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| Online Access: | https://www.mdpi.com/2223-7747/13/7/1036 |
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| author | Tianxiao Chen Yanan Niu Changdeng Yang Yan Liang Jianlong Xu |
| author_facet | Tianxiao Chen Yanan Niu Changdeng Yang Yan Liang Jianlong Xu |
| author_sort | Tianxiao Chen |
| collection | DOAJ |
| description | Soil salinity imposes osmotic, ionic, and oxidative stresses on plants, resulting in growth inhibition, developmental changes, metabolic adaptations, and ion sequestration or exclusion. Identifying salinity-tolerant resources and understanding physiological and molecular mechanisms of salinity tolerance could lay a foundation for the improvement of salinity tolerance in rice. In this study, a series of salinity-tolerance-related morphological and physiological traits were investigated in 46 rice genotypes, including Sea Rice 86, to reveal the main strategies of rice in responding to salinity stress at the seedling stage. No genotypes showed the same tolerance level as the two landraces Pokkali and Nona Bokra, which remain the donors for improving the salinity tolerance of rice. However, due to undesirable agronomic traits of these donors, alternative cultivars such as JC118S and R1 are recommended as novel source of salinity tolerance. Correlation and principal component analyses revealed that the salinity tolerance of rice seedlings is not only controlled by growth vigor but also regulated by ion transport pathways such as long-distance Na<sup>+</sup> transport, root Na<sup>+</sup> sequestration, and root K<sup>+</sup> retention. Therefore, such key traits should be targeted in future breeding programs as the strategy of obtaining better Na<sup>+</sup> exclusion is still the bottleneck for improving salinity tolerance in rice. |
| first_indexed | 2024-04-24T10:36:40Z |
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| institution | Directory Open Access Journal |
| issn | 2223-7747 |
| language | English |
| last_indexed | 2024-04-24T10:36:40Z |
| publishDate | 2024-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Plants |
| spelling | doaj.art-4fd6f8adac9d4dac929578bbf56c361b2024-04-12T13:24:55ZengMDPI AGPlants2223-77472024-04-01137103610.3390/plants13071036Screening of Rice (<i>Oryza sativa</i> L.) Genotypes for Salinity Tolerance and Dissecting Determinants of Tolerance MechanismTianxiao Chen0Yanan Niu1Changdeng Yang2Yan Liang3Jianlong Xu4State Key Laboratory of Rice Biology, China National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 310006, ChinaState Key Laboratory of Crop Gene Resources and Breeding, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, ChinaState Key Laboratory of Rice Biology, China National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 310006, ChinaState Key Laboratory of Rice Biology, China National Center for Rice Improvement, China National Rice Research Institute, Hangzhou 310006, ChinaState Key Laboratory of Crop Gene Resources and Breeding, Institute of Crop Sciences, Chinese Academy of Agricultural Sciences, Beijing 100081, ChinaSoil salinity imposes osmotic, ionic, and oxidative stresses on plants, resulting in growth inhibition, developmental changes, metabolic adaptations, and ion sequestration or exclusion. Identifying salinity-tolerant resources and understanding physiological and molecular mechanisms of salinity tolerance could lay a foundation for the improvement of salinity tolerance in rice. In this study, a series of salinity-tolerance-related morphological and physiological traits were investigated in 46 rice genotypes, including Sea Rice 86, to reveal the main strategies of rice in responding to salinity stress at the seedling stage. No genotypes showed the same tolerance level as the two landraces Pokkali and Nona Bokra, which remain the donors for improving the salinity tolerance of rice. However, due to undesirable agronomic traits of these donors, alternative cultivars such as JC118S and R1 are recommended as novel source of salinity tolerance. Correlation and principal component analyses revealed that the salinity tolerance of rice seedlings is not only controlled by growth vigor but also regulated by ion transport pathways such as long-distance Na<sup>+</sup> transport, root Na<sup>+</sup> sequestration, and root K<sup>+</sup> retention. Therefore, such key traits should be targeted in future breeding programs as the strategy of obtaining better Na<sup>+</sup> exclusion is still the bottleneck for improving salinity tolerance in rice.https://www.mdpi.com/2223-7747/13/7/1036<i>Oryza sativa</i>salinity tolerancephysiological mechanismprincipal component analysiscluster analysis |
| spellingShingle | Tianxiao Chen Yanan Niu Changdeng Yang Yan Liang Jianlong Xu Screening of Rice (<i>Oryza sativa</i> L.) Genotypes for Salinity Tolerance and Dissecting Determinants of Tolerance Mechanism Plants <i>Oryza sativa</i> salinity tolerance physiological mechanism principal component analysis cluster analysis |
| title | Screening of Rice (<i>Oryza sativa</i> L.) Genotypes for Salinity Tolerance and Dissecting Determinants of Tolerance Mechanism |
| title_full | Screening of Rice (<i>Oryza sativa</i> L.) Genotypes for Salinity Tolerance and Dissecting Determinants of Tolerance Mechanism |
| title_fullStr | Screening of Rice (<i>Oryza sativa</i> L.) Genotypes for Salinity Tolerance and Dissecting Determinants of Tolerance Mechanism |
| title_full_unstemmed | Screening of Rice (<i>Oryza sativa</i> L.) Genotypes for Salinity Tolerance and Dissecting Determinants of Tolerance Mechanism |
| title_short | Screening of Rice (<i>Oryza sativa</i> L.) Genotypes for Salinity Tolerance and Dissecting Determinants of Tolerance Mechanism |
| title_sort | screening of rice i oryza sativa i l genotypes for salinity tolerance and dissecting determinants of tolerance mechanism |
| topic | <i>Oryza sativa</i> salinity tolerance physiological mechanism principal component analysis cluster analysis |
| url | https://www.mdpi.com/2223-7747/13/7/1036 |
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