What are the physical and physiological symptoms of a high light-stressed plant?
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High light stress in plants induces various physical and physiological symptoms. Physically, exposure to high light can lead to damage to the photosynthetic apparatus, including photooxidative damage, photoinhibition of PSII, and potential damage to PSI . Physiologically, high light stress triggers responses such as the dissipation of excess energy through nonphotochemical quenching, activation of stress-responsive nuclear genes, and accumulation of reactive oxygen species, leading to chloroplast retrograde signaling . Additionally, high light stress can result in the downregulation of genes encoding light-harvesting proteins, accumulation of C4 acids, and tight balancing of redox homeostasis through various mechanisms like enhanced subcellular redistribution of reducing equivalents . These symptoms collectively reflect the plant's acclimation and defense mechanisms against the detrimental effects of high light stress.
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| Papers (5) | Insight |
|---|---|
| High-light stress induces sun-type chloroplast formation, de-epoxidation of violaxanthin to zeaxanthin, increased heat emission, and photoinhibition. Chlorophyll fluorescence measurements help assess photoinhibition accurately. | |
15 Feb 2023 | Physical symptoms of high light-stressed plants include downregulation of light harvesting proteins, accumulation of C4 acids, and tight redox homeostasis. Physiological responses involve NADPH reduction and reactive oxygen species quenching. |
| Physical symptoms include photooxidative damage, photoinhibition of PSII, and PSI damage. Physiologically, stress activates nuclear genes, alters hormone levels, and triggers alternate electron flow mechanisms for adaptation. | |
| High light-stressed plants show alleviated photoinhibition, reduced membrane damage, and altered gene expression related to photosynthesis and stress pathways, as observed in maize under chilling stress. | |
| High light-stressed plants exhibit increased xanthophyll pigments, elevated malate levels, and decreased Crassulacean Acid Metabolism (CAM) expression, indicating photoprotective responses and metabolic changes. |
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