Key Lab of Plant Biotechnology in Universities of Shandong Province, College of Life Sciences, Qingdao Agricultural University, Qingdao, 266109, China; Stress Physiology and Molecular Biology Lab of Fruit Trees, China Agricultural University, Beijing, 100193, China.
Key Lab of Plant Biotechnology in Universities of Shandong Province, College of Life Sciences, Qingdao Agricultural University, Qingdao, 266109, China.
Plant Physiol Biochem. 2019 Mar;136:162-168. doi: 10.1016/j.plaphy.2019.01.022. Epub 2019 Jan 21.
To further dissect the mechanism of salt tolerance in Malus, the comparison was made regarding the differences between the salt-tolerant and salt-sensitive species in sodium accumulation and extrusion capability in the roots and stem base as well as the sodium re-transportation from shoot to roots by using Na labeling-based feeding of leaves and roots-split experiments. The results demonstrated that the salt-tolerant Malus species could accumulate more Na in the main roots, lateral roots, stem base phloem and xylem, and extrude more sodium out than the salt-sensitive one. In addition, the salt-tolerant Malus species had the higher sodium re-transportation rate from shoot to roots. Altogether, it is concluded that the stronger sodium accumulation and extrusion in the roots and the stronger sodium re-transportation from shoot to roots in the salt-tolerant species play important roles in salt tolerance of Malus species.
为了进一步剖析苹果属植物耐盐的机制，利用 Na 标记的叶片喂养和根系分离实验，比较了耐盐和盐敏感物种在根部和茎基部的钠积累和排出能力，以及由叶片向根部的钠再转运能力的差异。结果表明，耐盐苹果属物种可以在主根、侧根、茎基部韧皮部和木质部积累更多的 Na，并将更多的钠离子排出体外，而盐敏感物种则相反。此外，耐盐苹果属物种具有更高的由叶片向根部的钠再转运率。总的来说，耐盐苹果属物种在根部具有更强的钠离子积累和排出能力，以及由叶片向根部更强的钠离子再转运能力，这在苹果属植物的耐盐性中起着重要作用。
