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MdINT1 enhances apple salinity tolerance by regulating the antioxidant system, homeostasis of ions, and osmosis.
- Source :
-
Plant Physiology & Biochemistry . Sep2020, Vol. 154, p689-698. 10p. - Publication Year :
- 2020
-
Abstract
- Myo -inositol is a versatile compound and plays a vital role in plant growth and stress tolerance. Previously, we found that exogenous application of myo -inositol enhanced the salinity tolerance in Malus hupehensis Rehd. by enhancing myo -inositol metabolism. In this study, we found that the tonoplast-localized myo -inositol transporter 1 (MdINT1) was involved in myo -inositol accumulation and conferred salinity tolerance in apple. MdINT1 is characterized by the highest transcripts among the four apple INT-like genes and could be induced by salt stress at the transcriptional level. Also, it was shown that myo- inositol level was slightly decreased in the leaves of transgenic apple lines over-expressing MdINT1 , but was significantly increased in the leaves and roots of MdINT1 silencing line. Interestingly, overexpression of MdINT1 enhanced salinity tolerance by promoting Na+ and K+ balance, antioxidant activity, and accumulation of osmoprotectants in transgenic apple lines. In contrast, under salinity conditions, the MdINT1-mediated protective roles in the antioxidant activity, homeostasis of ions and osmosis were compromised, which in turn increased the risk of salt intolerance in the MdINT1 silencing line. • The tonoplast-localized MdINT1 is involved in the apple myo -inositol accumulation. • Salt stress increases the transcript level of MdINT1. • MdINT1 confers salinity tolerance in apple. • MdINT1 could improve the antioxidant system, homeostasis of ions, and osmosis in salt-stressed apple plants. [ABSTRACT FROM AUTHOR]
- Subjects :
- *SALINITY
*APPLES
*OSMOSIS
*APPLE varieties
*HOMEOSTASIS
*IONS
Subjects
Details
- Language :
- English
- ISSN :
- 09819428
- Volume :
- 154
- Database :
- Academic Search Index
- Journal :
- Plant Physiology & Biochemistry
- Publication Type :
- Academic Journal
- Accession number :
- 145531554
- Full Text :
- https://doi.org/10.1016/j.plaphy.2020.06.041