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Physiological response of Miscanthus genotypes to salinity stress under elevated CO 2
Miscanthus is a class of C 4 perennial grasses, which can be cultivated on marginal land even with high salinity. However, the future environment may be altered by elevated atmospheric CO 2 concentration ([CO 2 ]) and knowledge is limited about the interactive impacts of CO 2 enrichment and salinity...
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| Published in: | Global change biology. Bioenergy 2022-07, Vol.14 (7), p.858-874 |
|---|---|
| Main Authors: | , , |
| Format: | Article |
| Language: | English |
| Citations: | Items that this one cites Items that cite this one |
| Online Access: | Get full text |
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| Summary: | Miscanthus
is a class of C
4
perennial grasses, which can be cultivated on marginal land even with high salinity. However, the future environment may be altered by elevated atmospheric CO
2
concentration ([CO
2
]) and knowledge is limited about the interactive impacts of CO
2
enrichment and salinity on this C
4
bioenergy crop. In this study, three
Miscanthus
genotypes (
M. sacchariflorus
,
M. × giganteus
, and
M. lutarioriparius
) were grown under either ambient (400 ppm) [CO
2
] (
a
[CO
2
]) or elevated (800 ppm) [CO
2
] (
e
[CO
2
]) at five salinity levels (0, 50, 100, 150, and 200 m
m
NaCl denoted as S0, S1, S2, S3, and S4, respectively), and the impacts of
e
[CO
2
] on plant physiological responses to salt stress were investigated. Our results suggested that
e
[CO
2
] had no obvious effect on net photosynthetic rate (
A
n
), but significantly reduced the stomatal conductance (
g
s
), thus improving water use efficiency regardless of salinity levels. In addition,
e
[CO
2
] could improve water potential of plants under both control and saline conditions, but the magnitude of increase was highly genotypic dependent. The maximum quantum yield of photosystem II (
F
v
/
F
m
) was not altered by
e
[CO
2
], which, however, could alleviate the negative effect of salt on
F
v
/
F
m
. Furthermore, salt stress increased the concentration of abscisic acid (ABA) in xylem sap and leaves, while the effect of
e
[CO
2
] on ABA level was closely associated with genotypes.
e
[CO
2
] reduced Na
+
concentration and had positive influences on maintaining Na
+
/K
+
ratio, thus favoring ionic homeostasis, although such effect was genotype dependent. Collectively, our data suggested that
e
[CO
2
] could partially mitigate the detrimental effects of salinity, conferring higher salt tolerance of
Miscanthus
. |
|---|---|
| ISSN: | 1757-1693 1757-1707 |
| DOI: | 10.1111/gcbb.12948 |