Heat at low light strongly reduced PSII activity, O2 evolution and B-band amplitude.

heat · physiology: photosynthesis · Hordeum vulgare (barley)Positive and negative results

4 papers in the same direction as this claim · 2 in the opposite direction

1. positive
   After stress relief, combined drought and heat improved recovery of photosynthetic electron transport relative to heat alone.

   Impact of Drought, Heat, and Their Combination on Chlorophyll Fluorescence and Yield of Wild Barley (Hordeum spontaneum) · 2015 · compared with heat stressed plants

   Opposite direction

2. positive
   In Tarm-92, heat shock pretreatment yielded higher Fm, Fv/Fm and PI than heat stress alone.

   Evaluation of Heat Shock-Induced Stress Tolerance to Some Abiotic Factors in Barley Seedlings by Chlorophyll a Fluorescence Technique · 2020 · compared with heat stress alone

   Opposite direction

3. negative
   Heat reduced barley photosynthetic performance.

   Leaf proteome alterations in the context of physiological and morphological responses to drought and heat stress in barley (Hordeum vulgare L.) · 2013

   Same direction

4. negative
   Heat-wave-induced reductions in barley photosynthetic rate, stomatal conductance and water use efficiency were larger under interspecific competition than in monoculture.

   Does interspecific competition change the barley's response and recovery from heat wave? · 2019 · compared with monocultured conditions

   Same direction

5. negative
   Heat stress reduced photosynthetic pigments.

   Effect of high temperature stress on Hordeum vulgare L. growth · 2025 · compared with 25°C (control)

   Same direction

6. negative
   Combined drought and heat caused a large decline in CO2 assimilation.

   Atmospheric CO2 concentration, light intensity and nitrogen nutrition affect spring barley response to drought and heat stress · 2021 · compared with heat stress alone

   Same direction

light · physiology: photosynthesis · Hordeum vulgare (barley)Positive and negative results

11 papers in the same direction as this claim · 6 in the opposite direction

1. no effect
   Growth light regime did not influence PS 2 photochemical activity.

   Light-Dark Changes in Proline Content of Barley Leaves under Salt Stress · 2002

   Same directionCited by this paper

2. positive
   Combined red, blue, far red and UV A light enhanced photosynthetic performance.

   Distinct Morphological, Physiological, and Biochemical Responses to Light Quality in Barley Leaves and Roots · 2019

   Opposite direction

3. positive
   Transition from growth irradiance to high photoinhibitory irradiance doubled the CO2 assimilation rate of barley leaves within minutes.

   Limitation of CO₂ Assimilation and Regulation of Benson-Calvin Cycle Activity in Barley Leaves in Response to Changes in Irradiance, Photoinhibition, and Recovery · 1989 · compared with growth irradiance

   Opposite direction

4. positive
   Blue light improves PSII stability.

   Blue light as an important factor increasing plant tolerance to acute photooxidative stress · 2024

   Opposite direction

5. positive
   Cloud-related light reduction temporarily increased photosystem II efficiency.

   The abundance of minor chlorophyll a/b-binding proteins CP29 and LHCI of barley (Hordeum vulgare L.) during leaf senescence is controlled by light · 2002

   Opposite direction

6. positive
   Light delayed senescence relative to darkness and maintained chlorophyll content, photosystem 2 photochemistry and electron transport.

   Xanthophyll cycle activity in detached barley leaves senescing under dark and light · 2005 · compared with dark-senescing ones

   Opposite direction

7. positive
   More blue-rich white light increased photosynthesis in young barley leaves.

   Effect of Abiotic Signals on the Accumulation of Saponarin in Barley Leaves in Hydroponics Under Artificial Lights · 2024

   Opposite direction

8. no effect
   Shade and sun barley leaves showed only low differences in PSII antenna size

   Photosynthetic responses of sun- and shade-grown barley leaves to high light: is the lower PSII connectivity in shade leaves associated with protection against excess of light? · 2014 · compared with sun

   Same direction

9 papers more in this group