Abstract
We investigated responses of wet climate (CY17) and dry climate (XN889) Trititcum aestivum L cultivars under 85, 55 and 25% field water capacity (FC). Less decrease in grain yield, relative water content, growth, gas exchange and chlorophyll fluorescence parameters indicated that XN889 was more drought-tolerant than CY17. At 55%FC, CY17 showed a lower net photosynthetic rate (Pn) than XN889 mainly due to stomatal closure. Stomatal closure was also observed in XN889, but its Pn was higher at 55%FC than at 85%FC. The higher Pn in XN889 may be associated with a higher chlorophyll content and resulting increase in photochemical quenching (qP), apparent electron transport rate, and effective quantum yield of photosystem II (PSII). Both cultivars showed photodamage at 25%FC, but XN889 showed less photodamage in terms of maximal PSII photochemical efficiency. XN889 showed higher qP and non-photochemical quenching than CY17, further demonstrating its superior drought tolerance.
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Claims 10
Claim · model-written summary
XN889 was more drought tolerant than CY17 across yield and physiological responses.
Verbatim
e0“Less decrease in grain yield, relative water content, growth, gas exchange and chlorophyll fluorescence parameters indicated that XN889 was more drought-tolerant than CY17.”
e1“Trititcum aestivum L cultivars”
Claim · model-written summary
At 55%FC CY17 had lower net photosynthetic rate than XN889.
Verbatim
e0“At 55%FC, CY17 showed a lower net photosynthetic rate (Pn) than XN889 mainly due to stomatal closure.”
e1“Trititcum aestivum L cultivars”
Claim · model-written summary
Stomatal closure was the main stated explanation for lower CY17 photosynthetic rate at 55%FC.
Verbatim
e0“At 55%FC, CY17 showed a lower net photosynthetic rate (Pn) than XN889 mainly due to stomatal closure.”
e1“Trititcum aestivum L cultivars”
Claim · model-written summary
XN889 showed stomatal closure.
Verbatim
e0“Stomatal closure was also observed in XN889”
e1“Trititcum aestivum L cultivars”
Claim · model-written summary
XN889 had higher photosynthetic rate at 55%FC than 85%FC.
Verbatim
e0“its Pn was higher at 55%FC than at 85%FC”
e1“observed in XN889, but its Pn”
e2“Trititcum aestivum L cultivars”
Claim · model-written summary
Higher chlorophyll content was proposed to be associated with higher XN889 photosynthetic rate.
Verbatim
e0“The higher Pn in XN889 may be associated with a higher chlorophyll content”
e1“Trititcum aestivum L cultivars”
Claim · model-written summary
Higher chlorophyll content was proposed to increase photochemical quenching, electron transport and effective PSII quantum yield.
Verbatim
e0“a higher chlorophyll content and resulting increase in photochemical quenching (qP), apparent electron transport rate, and effective quantum yield of photosystem II (PSII)”
e1“Trititcum aestivum L cultivars”
Claim · model-written summary
Both cultivars showed photodamage at 25%FC.
Verbatim
e0“Both cultivars showed photodamage at 25%FC”
e1“Trititcum aestivum L cultivars”
Claim · model-written summary
XN889 showed less photodamage than CY17 at 25%FC.
Verbatim
e0“XN889 showed less photodamage in terms of maximal PSII photochemical efficiency”
e1“Both cultivars showed photodamage at 25%FC”
e2“Trititcum aestivum L cultivars”
Claim · model-written summary
XN889 had higher qP and non-photochemical quenching than CY17.
Verbatim
e0“XN889 showed higher qP and non-photochemical quenching than CY17”
e1“Trititcum aestivum L cultivars”