Short-term elevated temperature and CO

Abstract

The continuous increases of atmospheric temperature and CO 2 concentration will impact global photosynthesis. However, there are few studies considering the interaction of elevated temperature (eT) and elevated CO 2 (eCO 2 ) on dynamic photosynthesis, particularly for C 4 species. We examine dynamic photosynthesis under four different temperature and [CO 2 ] treatments:(1) 400 ppm × 28°C (CT); (2) 400 ppm × 33°C (CT+); (3) 800 ppm × 28°C (C+T); and (4) 800 ppm × 33°C (C+T+). In Glycine max L., the time required to reach 50% (T 50%A ) and 90% (T 90%A ) of full photosynthetic induction was smaller under the CT+, C+T, and C+T+ treatments than those under the CT treatment. In Amaranthus tricolor L., however, neither T 50%A nor T 90%A was not significantly affected by eT or eCO 2 . In comparison with the CT treatment, the achieved carbon gain was increased by 58.3% (CT+), 112% (C+T), and 136.6% (C+T+) in G. max and was increased by 17.1% (CT+), 2.6% (C+T) and 56.9% (C+T+) in A. tricolor. The increases of achieved carbon gain in G. max were attributable to both improved photosynthetic induction efficiency (IE) and enhanced steady-state photosynthesis, whereas those in A. tricolor were attributable to enhanced steady-state photosynthesis.

Effects of Environmental and Non-Environmental Factors on Dynamic Photosynthetic Carbon Assimilation in Leaves under Changing Light

“…Recent research in three phylogenetically linked pairs of C3 and C4 species from the Alloteropsis , Flaveria and Cleome genera indicated that photosynthetic induction was slower in C4 than in C3 species [ 65 ]. Zheng also reported that photosynthetic induction was much faster in the C4 species Amaranthus tricolor than in the C3 species Glycine max ; in addition, this research reported that short-term elevated temperature and carbon dioxide conditions promoted photosynthetic induction in the C3 species Glycine max , but not in the C4 species Amaranthus tricolor [ 66 ].…”

Climate change increases net CO2assimilation in the leaves of strawberry, but not yield

“…Net CO 2 assimilation in amaranth decreased an average of 33% compared with the control. Zheng et al (2022) conducted similar work with Glycine max or soybean (C 3 ) and Amaranthus tricolor (C 4 ) in China. There were four combinations of temperature (28° or 35°C) and CO 2 (400 or 800 ppm) with a PPF of 600 µmol per m 2 per s. In Glycine max, high temperatures increased gas exchange under both low and high CO 2 compared with the other regimes.…”

Strategies to alleviate the unusual effects of climate change on crop production: a thirsty and warm future, low crop quality. A review

“…However, crops with a C 4 photosynthetic pathway (e.g., maize and sugarcane) profit from this condition. It appears that C 4 plants benefit from climate change and increased temperatures due to the nature of their photosynthetic system; however, temperatures above 38°C inhibit photosynthesis (Zheng et al, 2022), whereas warming at night raises respiration costs without any potential benefit for photosynthesis (Sadras, Calderini, 2015). Thirdly, warming raises the vapor pressure deficit (VPD) between air and the leaf and increases transpiration and water loss.…”