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Root-zone-specific sensitivity of K+-and Ca2+-permeable channels to H2O2 determines ion homeostasis in salinized diploid and hexaploid Ipomoea trifida
- Source :
- Journal of Experimental Botany
- Publication Year :
- 2019
- Publisher :
- Oxford University Press (OUP), 2019.
-
Abstract
- Low sensitivity to H2O2 of PM K+-permeable channels in the meristem root zone and high sensitivity of PM Ca2+-permeable channels in the elongation and mature root zones are correlated with ploidy-dependent K+ retention and Na+ exclusion under salt stress.<br />Polyploids generally possess superior K+/Na+ homeostasis under saline conditions compared with their diploid progenitors. In this study, we identified the physiological mechanisms involved in the ploidy-related mediation of K+/Na+ homeostasis in the roots of diploid (2x) and hexaploid (6x; autohexaploid) Ipomoea trifida, which is the closest relative of cultivated sweet potato. Results showed that 6x I. trifida retained more K+ and accumulated less Na+ in the root and leaf tissues under salt stress than 2x I. trifida. Compared with its 2x ancestor, 6x I. trifida efficiently prevents K+ efflux from the meristem root zone under salt stress through its plasma membrane (PM) K+-permeable channels, which have low sensitivity to H2O2. Moreover, 6x I. trifida efficiently excludes Na+ from the elongation and mature root zones under salt stress because of the high sensitivity of PM Ca2+-permeable channels to H2O2. Our results suggest the root-zone-specific sensitivity to H2O2 of PM K+- and Ca2+-permeable channels in the co-ordinated control of K+/Na+ homeostasis in salinized 2x and 6x I. trifida. This work provides new insights into the improved maintenance of K+/Na+ homeostasis of polyploids under salt stress.
- Subjects :
- 0106 biological sciences
0301 basic medicine
K+/Na+ homeostasis
Salinity
Potassium Channels
Physiology
H2O2
Plant Science
Plant Roots
01 natural sciences
Polyploidy
03 medical and health sciences
Polyploid
Homeostasis
Ca2+ transport
salinity stress
Plant Proteins
Chemistry
Na+ exclusion
polyploid
food and beverages
Hydrogen Peroxide
Meristem
Research Papers
Diploidy
K+ retention
030104 developmental biology
Ion homeostasis
Plant—Environment Interactions
Biophysics
DNS root zone
Calcium Channels
Ipomoea
Efflux
Ploidy
Elongation
010606 plant biology & botany
Subjects
Details
- ISSN :
- 14602431 and 00220957
- Volume :
- 70
- Database :
- OpenAIRE
- Journal :
- Journal of Experimental Botany
- Accession number :
- edsair.doi.dedup.....fb354ceb5089bde9853c6c8afad37162