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The SlCBL10 Calcineurin B-Like Protein Ensures Plant Growth under Salt Stress by Regulating Na + and Ca 2+ Homeostasis
Characterization of a new tomato ( ) T-DNA mutant allowed for the isolation of the ( ) gene whose lack of function was responsible for the severe alterations observed in the shoot apex and reproductive organs under salinity conditions. Physiological studies proved that gene is required to maintain a...
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Published in: | Plant physiology (Bethesda) 2018-02, Vol.176 (2), p.1676-1693 |
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Main Authors: | , , , , , , , , , , , , , , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that cite this one |
Online Access: | Get full text |
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Summary: | Characterization of a new tomato (
) T-DNA mutant allowed for the isolation of the
(
) gene whose lack of function was responsible for the severe alterations observed in the shoot apex and reproductive organs under salinity conditions. Physiological studies proved that
gene is required to maintain a proper low Na
/Ca
ratio in growing tissues allowing tomato growth under salt stress. Expression analysis of the main responsible genes for Na
compartmentalization (i.e.
,
,
,
[
] and V-ATPase [
]) supported a reduced capacity to accumulate Na
in
mutant leaves, which resulted in a lower uploading of Na
from xylem, allowing the toxic ion to reach apex and flowers. Likewise, the tomato
and
(
), key genes for Ca
fluxes to the vacuole, showed abnormal expression in
plants indicating an impaired Ca
release from vacuole. Additionally, complementation assay revealed that
is a true ortholog of the Arabidopsis (
)
gene, supporting that the essential function of CBL10 is conserved in Arabidopsis and tomato. Together, the findings obtained in this study provide new insights into the function of
in salt stress tolerance. Thus, it is proposed that SlCBL10 mediates salt tolerance by regulating Na
and Ca
fluxes in the vacuole, cooperating with the vacuolar cation channel
and the two vacuolar H
-pumps,
and
, which in turn are revealed as potential targets of
. |
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ISSN: | 0032-0889 1532-2548 |
DOI: | 10.1104/pp.17.01605 |