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Plant Physiol Biochem. 2019 Mar;136:162-168. doi: 10.1016/j.plaphy.2019.01.022. Epub 2019 Jan 21.

Distribution and re-transportation of sodium in three Malus species with different salt tolerance.

Author information

1
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. Electronic address: hbyang@qau.edu.cn.
2
Key Lab of Plant Biotechnology in Universities of Shandong Province, College of Life Sciences, Qingdao Agricultural University, Qingdao, 266109, China.
3
Stress Physiology and Molecular Biology Lab of Fruit Trees, China Agricultural University, Beijing, 100193, China.
4
Stress Physiology and Molecular Biology Lab of Fruit Trees, China Agricultural University, Beijing, 100193, China. Electronic address: rschan@cau.edu.cn.

Abstract

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 22Na labeling-based feeding of leaves and roots-split experiments. The results demonstrated that the salt-tolerant Malus species could accumulate more 22Na 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.

KEYWORDS:

(22)Na labeling; Malus; Salt tolerance; Sodium accumulation; Sodium re-transportation

PMID:
30684845
DOI:
10.1016/j.plaphy.2019.01.022
[Indexed for MEDLINE]

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