Abstract
Recently, several reports have suggested that the growth and grain yield of wheat are significantly influenced by high atmospheric carbon dioxide concentration (CO 2 ) because of it photosynthesis enhancing effects. Moreover, it has been proposed that plants with large carbon sink size will benefit more from CO 2 enrichment than those with small carbon sink size. However, this hypothesis is yet to be test in winter wheat plant. Therefore, the aim of this study was to examine the effect of elevated CO 2 (eCO 2 ) conditions on the quantum efficiency of photosystem II (PSII) photochemistry in large ear-type (cv. Shanhan 8675; greater ear C sink strength) and small multiple ear-type (cv. Early premium; greater vegetative C source strength) winter wheat varieties. The experiment was conducted in a free air CO 2 enrichment (FACE) facility, and three de-excitation pathways of the primary reaction of PSII of flag leaf at the anthesis stage were evaluated under two CO 2 concentrations (ambient [CO 2 ], ∼415 μmol⋅mol –1 , elevated [CO 2 ], ∼550 μmol⋅mol –1 ) using a non-destructive technique of modulated chlorophyll fluorescence. Additionally, the grain yield of the two varieties was determined at maturity. Although elevated CO 2 increased the quantum efficiency of PSII photochemistry (Φ PSII ) of Shanhan 8675 (SH8675) flag leaves at the anthesis stage, the grain number per ear and 1,000-kernel weight were not significantly affected. In contrast, the Φ PSII of early premium (ZYM) flag leaves was significantly lower than that of SH8675 flag leaves at the anthesis stage, which was caused by an increase in the regulatory non-photochemical energy dissipation quantum (Φ NPQ ) of PSII, suggesting that light energy absorbed by PSII in ZYM flag leaf was largely dissipated as thermal energy. The findings of our study showed that although SH8675 flag leaves exhibited higher C sink strength and quantum efficiency of PSII photochemistry at the anthesis stage, these factors alone do not ensure improved grain yield under eCO 2 conditions.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 6
Claim · model-written summary
Elevated CO2 increased flag leaf PSII efficiency in Shanhan 8675 wheat at anthesis.
- Taxon
- Wheat
Triticum aestivumt0 - Material
- Shanhan 8675e0
- Organ / stage
- flag leaves at the anthesis stagee0
- Treatment
- elevated CO 2e0
- Outcome
- quantum efficiency of PSII photochemistrye0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“elevated CO 2 increased the quantum efficiency of PSII photochemistry (Φ PSII ) of Shanhan 8675 (SH8675) flag leaves at the anthesis stage”
t0“Wheat”
Claim · model-written summary
Elevated CO2 did not significantly affect grain number per ear in Shanhan 8675 wheat.
- Taxon
- WheatTriticum aestivumt0
- Material
- Shanhan 8675e1
- Treatment
- elevated CO 2e2
- Outcome
- grain number per eare0
- Direction
- not significantly affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the grain number per ear and 1,000-kernel weight were not significantly affected”
t0“Wheat”
e1“Shanhan 8675 (SH8675) flag leaves”
e2“elevated CO 2 increased”
Claim · model-written summary
Elevated CO2 did not significantly affect thousand kernel weight in Shanhan 8675 wheat.
- Taxon
- WheatTriticum aestivumt0
- Material
- Shanhan 8675e1
- Treatment
- elevated CO 2e2
- Outcome
- 1,000-kernel weighte0
- Direction
- not significantly affectede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the grain number per ear and 1,000-kernel weight were not significantly affected”
t0“Wheat”
e1“Shanhan 8675 (SH8675) flag leaves”
e2“elevated CO 2 increased”
Claim · model-written summary
Early premium wheat flag leaves had significantly lower PSII efficiency than Shanhan 8675 at anthesis.
- Taxon
- WheatTriticum aestivumt0
- Material
- early premiume0
- Organ / stage
- flag leavese0
- Outcome
- Φ PSIIe0
- Direction
- lowere0
- Comparator
- SH8675e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the Φ PSII of early premium (ZYM) flag leaves was significantly lower than that of SH8675 flag leaves at the anthesis stage”
t0“Wheat”
Claim · model-written summary
Early premium wheat had increased regulatory nonphotochemical energy dissipation, explaining its lower PSII efficiency.
- Taxon
- WheatTriticum aestivumt0
- Material
- early premiume1
- Outcome
- Φ PSIIe1
- Direction
- lowere1
- Qualifier
- regulatory non-photochemical energy dissipation quantume0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“which was caused by an increase in the regulatory non-photochemical energy dissipation quantum (Φ NPQ ) of PSII”
e1“the Φ PSII of early premium (ZYM) flag leaves was significantly lower than that of SH8675 flag leaves”
t0“Wheat”
Claim · model-written summary
Greater sink strength and PSII efficiency in Shanhan 8675 alone did not ensure improved grain yield under elevated CO2.
- Taxon
- WheatTriticum aestivumt0
- Material
- SH8675e0
- Treatment
- eCO 2 conditionse0
- Outcome
- grain yielde0
- Direction
- do not ensure improvede0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“although SH8675 flag leaves exhibited higher C sink strength and quantum efficiency of PSII photochemistry at the anthesis stage, these factors alone do not ensure improved grain yield under eCO 2 conditions”
t0“Wheat”
The same questions in other papers
co2 · physiology: photosynthesis · Triticum aestivum (wheat)Positive and negative results
68 papers in the same direction as this paper · 28 in the opposite direction
- negative
- negative
- no effect
93 papers more in this group
See all 97 papers →co2 · yield · Triticum aestivum (wheat)Positive and negative results
28 papers in the same direction as this paper · 174 in the opposite direction
- positive
- positive
- positive
199 papers more in this group
See all 203 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.