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Root Na<sup>+</sup> Content Negatively Correlated to Salt Tolerance Determines the Salt Tolerance of <i>Brassica napus</i> L. Inbred Seedlings
oleh: Cheng-Feng Wang, Guo-Liang Han, Zi-Qi Qiao, Yu-Xia Li, Zong-Ran Yang, Bao-Shan Wang
Format: | Article |
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Diterbitkan: | MDPI AG 2022-03-01 |
Deskripsi
Soil salinization is a major environmental stressor that reduces the growth and yield of crops. Maintaining the balance of ions under salinity is vital for plant salt tolerance; however, little is known about the correlation between the salt tolerance of crops and the ion contents of their roots and shoots. Here, we investigated the poorly understood salt-tolerance mechanisms, particularly regarding ion contents (particularly Na<sup>+</sup>), in <i>Brassica napus</i> subsp. <i>napus</i> L., an agriculturally important species. Twenty <i>B. napus</i> inbred lines were randomly chosen from five salt-tolerance categories and treated with increasing concentrations of NaCl (0–200 mmol) for this work. We found that the root Na<sup>+</sup> content is the most correlated limiting factor for the salt tolerance of <i>B. napus</i>; the higher the salt tolerance, the lower the root Na<sup>+</sup> content. Correspondingly, the Ca<sup>2+</sup>/Na<sup>+</sup> and K<sup>+</sup>/Na<sup>+</sup> ratios of the roots were highly correlated with <i>B. napus</i> salt tolerance, indicating that the selective absorption ability of these ions by the roots and their translocation to the shoots play a pivotal role in this trait. These data provide a foundation for the further study of the molecular mechanisms underlying salt tolerance and for breeding salt-tolerant <i>B. napus</i> cultivars.