Carbon isotope discrimination by Sorghum bicolor under CO2 enrichment and drought

  title={Carbon isotope discrimination by Sorghum bicolor under CO2 enrichment and drought},
  author={David G. Williams and V. L. Gempko and Alessandra Fravolini and Steven W. Leavitt and Gerard W. Wall and Bruce A. Kimball and Paul J. Pinter and Robert L. LaMorte and Michael J. Ottman},
  journal={New Phytologist},
Summary •  Sorghum bicolor was exposed to free-air CO2 enrichment (FACE) and drought at the Maricopa Agricultural Center, AZ, USA, in summer 1998. We predicted that bundle sheath leakiness (Φ) would be insensitive to FACE under well-irrigated (wet) conditions, but would be lower in FACE compared with control-CO2 treatments when irrigation was withheld (dry). •  Leaf and air δ13C values and leaf pi/pa from gas exchange were measured to estimate carbon isotope discrimination (Δ) and F. Midday… 

Figures and Tables from this paper

Elevated atmospheric CO2 improved Sorghum plant water status by ameliorating the adverse effects of drought

○ The interactive effects of atmospheric CO 2 concentration and soil-water content on grain sorghum (Sorghum bicolor) are reported here. ○ Sorghum plants were exposed to ambient (control) and

Carbon isotopes and water use efficiency in C4 plants.

Determination of leaf carbon isotope discrimination in C4 plants under variable N and water supply

Leaf carbon isotope composition, Nleaf, Ф, and leaf gas exchange were measured in Cleistogenes squarrosa, a dominant C4 species in the Inner Mongolia grassland and Δ remained relatively stable under variable N and water supply.

Photosynthetic response of sweet sorghum to drought and re-watering at different growth stages.

Evaluating the effects of drought and re-watering on the photosynthetic efficiency of sweet sorghum found down regulation of the photochemistry seems to be the main photoprotective/regulative mechanisms, while at late growth stages, the accumulation of compatible solutes likely has a more preponderant role.

Nonstomatal limitations are responsible for drought-induced photosynthetic inhibition in four C4 grasses.

It is concluded that inhibition of photosynthesis in the four C4 grasses under water stress is dependent mainly on biochemical limitations.

Photorespiration in C4 grasses remains slow under drought conditions.

Analysis of amino acids contained in the leaves supported the presence of slow photorespiration rates, but these were slightly faster in Cynodon dactylon than in Paspalum dilatatum and Zoysia japonica, providing evidence that photoreSpiration remained slow under drought conditions.

Light and growth temperature alter carbon isotope discrimination and estimated bundle sheath leakiness in C4 grasses and dicots

It is concluded that conditions favourable to C4 photosynthesis (high temperature and high light) lead to a reduction in leakiness.

The relationships between carbon isotope discrimination and photosynthesis and rice yield under shading

It was found that lower values of ∆Lg, ∆Sm and ∆Gm in rice indicated better light-harvesting and light-use capability and also higher grain filling and grain weight of rice.



CO2 enrichment increases water-use efficiency in sorghum

Summary • Sorghum (Sorghum bicolor) was grown for two consecutive seasons at Maricopa, AZ, USA, using the free-air CO2 enrichment (FACE) approach to investigate evapotranspiration of this C4 plant

Reduced photorespiration and increased energy‐use efficiency in young CO2‐enriched sorghum leaves

The stimulation of C4 photosynthesis at elevated Ca in young leaves was partially due to suppressed photorespiration, and elevated Ca enhanced energy-use efficiency inYoung leaves, possibly by decreasing CO2 leakage from bundle sheath cells, and by decreasing overcycling of the C4 pump.

Elevated CO2 increases sorghum biomass under drought conditions

Summary •  Atmospheric CO2 concentration is expected to increase by 50% near the middle of this century. The effects the free air CO2 enrichment (FACE) is presented here on growth and development of

Short-Term Changes in Leaf Carbon Isotope Discrimination in Salt- and Water-Stressed C4 Grasses

Online carbon isotope discrimination (Δ) and leaf gas exchange measurements were made with control and salt-stressed Zea mays and Andropogon glomeratus, two NADP-ME type C4 grasses. Linear

Carbon Isotope Discrimination, Gas Exchange, and Growth of Sugarcane Cultivars under Salinity

Carbon isotope discrimination in tissue obtained from the uppermost fully expanded leaf increased with salinity and with time elapsed from the beginning of the experiment, but [delta] was consistently lower in the resistant than in the susceptible cultivar at all levels of salinity.

Carbon isotope composition of C4 grasses is influenced by light and water supply

The carbon isotope composition of C4 grasses has the potential to be used as an indicator of changes in the isotopic composition and concentration of atmospheric CO2, especially for climate

Associations between partitioning of carboxylase activity and bundle sheath leakiness to CO2, carbon isotope discrimination, photosynthesis, and growth in sugarcane

A can serve as an integrated measure of underlying variation in photosynthetic biochemistry associated with variation in performance at the whole plant level in sugarcane and probably other C 4 species.

Productivity and water use of wheat under free‐air CO2 enrichment

A free-air CO2 enrichment (FACE) experiment was conducted at Maricopa, Arizona, on wheat from December 1992 through May 1993. The FACE apparatus maintained the CO2 concentration, [CO2], at 550 μmol

Photosynthetic and Water Relations Responses to Elevated CO2 in the C4 Grass Andropogon gerardii

Effects of elevated CO<sub>2</sub> may only be detectable in years with significant water stress, a common occurrence in the central North American tallgrass prairies.