Untitled

Ernstsen, Jerriann; Woodrow, Ian E.; Mott, Keith A.

doi:10.1023/a:1005847500471

Cited by 20 publications

(6 citation statements)

References 21 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Modelling of these results augments predictions of 2–20% impacts of shade-induced changes in Rubisco activity on diurnal photosynthesis 2 , 3 . Prior estimates have relied on gas exchange in wheat 1 , where estimated τ d was slightly longer than τ a , consistent with measurements using S in spinach, basil and impatiens 16 , 17 . Longer deactivation times, important for exploitation of sunflecks, have also been reported in the tropical understorey species Alocasia macrorrhiza 15 .…”

Section: Mainsupporting

confidence: 57%

“…A foundational study using both methods with spinach 16 found long deactivation half-times of >1,440 s; however, subsequent gas exchange measurements estimated only 606 s for the same species 23 . Furthermore, basil and impatiens showed faster Rubisco deactivation on the basis of in vitro biochemistry than gas exchange 17 . Parameterization of Rubisco deactivation therefore remains a key uncertainty in addressing impacts of Rubisco activation on crop productivity 2 .…”

Section: Mainmentioning

confidence: 95%

“…Estimates of τ a for other crops derived from gas exchange range from ~100 to 350 s (refs. 1 , 2 , 17 , 20 , 21 , 27 ) and decrease at higher assay temperatures as used here 27 .

Fig.…”

Section: Mainmentioning

confidence: 99%

“…Throughout a day, light reaching chloroplasts steps-up or steps-down by 90% within a second 3 . In shade, biochemical adjustments improve the efficiency with which chloroplasts use absorbed light 9 but the light-dependent supply of RuBP is insufficient to saturate Rubisco catalytic sites, allowing decarbamylation and/or sugar-phosphate inhibition to decrease Rubisco activity 15 – 17 . Following shade–sun transitions, Rubisco activation is among the slowest responding of the biochemical processes that tune photosynthetic capacity to match incoming light 18 , 19 .…”

Section: Mainmentioning

confidence: 99%

See 3 more Smart Citations

Faster than expected Rubisco deactivation in shade reduces cowpea photosynthetic potential in variable light conditions

et al. 2022

View full text Add to dashboard Cite

Cowpea is the major source of vegetable protein for rural populations in sub-Saharan Africa and average yields are not keeping pace with population growth. Each day, crop leaves experience many shade events and the speed of photosynthetic adjustment to this dynamic environment strongly affects daily carbon gain. Rubisco activity is particularly important because it depends on the speed and extent of deactivation in shade and recovers slowly on return to sun. Here, direct biochemical measurements showed a much faster rate of Rubisco deactivation in cowpea than prior estimates inferred from dynamics of leaf gas exchange in other species1–3. Shade-induced deactivation was driven by decarbamylation, and half-times for both deactivation in shade and activation in saturating light were shorter than estimates from gas exchange (≤53% and 79%, respectively). Incorporating these half-times into a model of diurnal canopy photosynthesis predicted a 21% diurnal loss of productivity and suggests slowing Rubisco deactivation during shade is an unexploited opportunity for improving crop productivity.

show abstract

Section: Mainsupporting

confidence: 57%

Section: Mainmentioning

confidence: 95%

“…Estimates of τ a for other crops derived from gas exchange range from ~100 to 350 s (refs. 1 , 2 , 17 , 20 , 21 , 27 ) and decrease at higher assay temperatures as used here 27 .

Fig.…”

Section: Mainmentioning

confidence: 99%

Section: Mainmentioning

confidence: 99%

See 2 more Smart Citations

Faster than expected Rubisco deactivation in shade reduces cowpea photosynthetic potential in variable light conditions

et al. 2022

View full text Add to dashboard Cite

show abstract

“…3, 4). The deactivation rate of Rubisco accounts for the divergent dynamic light utilization capacity between two vascular species (Ernstsen et al 1997).…”

Section: Photosynthetic Light Inductionmentioning

confidence: 99%

Photosynthetic response to dynamic changes of light and air humidity in two moss species from the Tibetan Plateau

Cui

et al. 2008

Ecological Research

View full text Add to dashboard Cite

Bryophytes are widely distributed in alpine meadow and wetlands on the Tibetan Plateau, where light intensity and air moisture are highly variable in time. To address how bryophytes respond to their light and moisture environments, we examined dynamic photosynthesis in two moss species, Distichium inclinatum common in meadow, and Encalypta alpine frequently found in wetland. Photosynthetic induction response was faster in the two moss species than in most vascular species. In both species the 90% induction time after a sudden light increase from 50 to 600 lmol m À2 s À1 was within 3 min. The induction was faster in mosses experiencing a period of weak light than in those in total darkness. E. alpina, the wetland species, showed more rapid induction response and shorter post-illumination CO 2 fixation to sunflecks than D. inclinatum, the meadow species. Photosynthetic rate (A max ) under saturated light in the two species increased linearly with increasing air relative humidity (RH). The meadow species D. inclinatum showed higher A max under low RHs, but exhibited lower A max under high RHs in comparison with the wetland moss E. alpina. Moreover, the quantum efficiency increased linearly with increasing RH, indicating that air humidity plays a critical role in photochemical activities in the alpine mosses. The study suggests that there are acclimations in dynamic photosynthesis in response to light and humidity, and the acclimations would benefit a high leaf carbon gain in the two alpine moss species in their common habitats.

show abstract