Effects of light intensity on photosynthesis and photoprotective mechanisms in apple under progressive drought
The effects of light intensity on photosynthesis and photoprotective mechanisms under progressive drought were studied on apple trees (Malus domestica Borkh.) Fuji. The potted trees were exposed to drought stress for 12 days and different light conditions (100, 60 and 25% sunlight). During the progr...
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| Format: | Article |
| Language: | English |
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Elsevier
2015-09-01
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| Series: | Journal of Integrative Agriculture |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2095311915611480 |
| _version_ | 1818663131584397312 |
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| author | Ping MA Tuan-hui BAI Xiao-qian WANG Feng-wang MA |
| author_facet | Ping MA Tuan-hui BAI Xiao-qian WANG Feng-wang MA |
| author_sort | Ping MA |
| collection | DOAJ |
| description | The effects of light intensity on photosynthesis and photoprotective mechanisms under progressive drought were studied on apple trees (Malus domestica Borkh.) Fuji. The potted trees were exposed to drought stress for 12 days and different light conditions (100, 60 and 25% sunlight). During the progressive drought, the relative water content (RWC) in leaf declined and was faster in full light than in 60 and 25% sunlight. However, the decrease in the net photosynthetic rate (Pn), stomatal conductance (Gs) and Rubisco activity were slower under 100% sunlight condition than other light conditions. After the 6 days of drought, the maximum PSII quantum yield (Fv/Fm), the capacity of electrons move beyond QA− (1–VJ) and electron move from intersystem to PSI acceptor side (1–VI)/(1–VJ) decreased, with greater decline extent in brighter light. While RWCs were >75%, the variations in different light intensities of Gs and Rubisco activity at identical RWC, suggested the direct effects of light. While the little difference in the state of photosynthetic electron transport chain among tested light intensities indicates the results of faster water loss rate of light. Our results also demonstrated that the enhancement the de-epoxidations of xanthophyll cycle, activities of ascorbate peroxidase (APX) and catalase (CAT) were directly regulated by light intensity. While the higher photorespiration rate (Pr) under stronger light condition was mainly caused by faster water loss rate of light. |
| first_indexed | 2024-12-17T05:11:58Z |
| format | Article |
| id | doaj.art-d5b51cdb0ca94fb4a0340f6701c70e81 |
| institution | Directory Open Access Journal |
| issn | 2095-3119 |
| language | English |
| last_indexed | 2024-12-17T05:11:58Z |
| publishDate | 2015-09-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Integrative Agriculture |
| spelling | doaj.art-d5b51cdb0ca94fb4a0340f6701c70e812022-12-21T22:02:13ZengElsevierJournal of Integrative Agriculture2095-31192015-09-0114917551766Effects of light intensity on photosynthesis and photoprotective mechanisms in apple under progressive droughtPing MA0Tuan-hui BAI1Xiao-qian WANG2Feng-wang MA3College of Horticulture, Northwest A&F University, State Key Laboratory of Crop Stress Biology for Arid Areas, Yangling 712100, P.R.ChinaCollege of Horticulture, Northwest A&F University, State Key Laboratory of Crop Stress Biology for Arid Areas, Yangling 712100, P.R.ChinaCollege of Horticulture, Northwest A&F University, State Key Laboratory of Crop Stress Biology for Arid Areas, Yangling 712100, P.R.ChinaCorrespondence MA Feng-wang, Tel/Fax: +86-29-87082648; College of Horticulture, Northwest A&F University, State Key Laboratory of Crop Stress Biology for Arid Areas, Yangling 712100, P.R.ChinaThe effects of light intensity on photosynthesis and photoprotective mechanisms under progressive drought were studied on apple trees (Malus domestica Borkh.) Fuji. The potted trees were exposed to drought stress for 12 days and different light conditions (100, 60 and 25% sunlight). During the progressive drought, the relative water content (RWC) in leaf declined and was faster in full light than in 60 and 25% sunlight. However, the decrease in the net photosynthetic rate (Pn), stomatal conductance (Gs) and Rubisco activity were slower under 100% sunlight condition than other light conditions. After the 6 days of drought, the maximum PSII quantum yield (Fv/Fm), the capacity of electrons move beyond QA− (1–VJ) and electron move from intersystem to PSI acceptor side (1–VI)/(1–VJ) decreased, with greater decline extent in brighter light. While RWCs were >75%, the variations in different light intensities of Gs and Rubisco activity at identical RWC, suggested the direct effects of light. While the little difference in the state of photosynthetic electron transport chain among tested light intensities indicates the results of faster water loss rate of light. Our results also demonstrated that the enhancement the de-epoxidations of xanthophyll cycle, activities of ascorbate peroxidase (APX) and catalase (CAT) were directly regulated by light intensity. While the higher photorespiration rate (Pr) under stronger light condition was mainly caused by faster water loss rate of light.http://www.sciencedirect.com/science/article/pii/S2095311915611480appledrought stressphotosynthesisphotoprotection |
| spellingShingle | Ping MA Tuan-hui BAI Xiao-qian WANG Feng-wang MA Effects of light intensity on photosynthesis and photoprotective mechanisms in apple under progressive drought Journal of Integrative Agriculture apple drought stress photosynthesis photoprotection |
| title | Effects of light intensity on photosynthesis and photoprotective mechanisms in apple under progressive drought |
| title_full | Effects of light intensity on photosynthesis and photoprotective mechanisms in apple under progressive drought |
| title_fullStr | Effects of light intensity on photosynthesis and photoprotective mechanisms in apple under progressive drought |
| title_full_unstemmed | Effects of light intensity on photosynthesis and photoprotective mechanisms in apple under progressive drought |
| title_short | Effects of light intensity on photosynthesis and photoprotective mechanisms in apple under progressive drought |
| title_sort | effects of light intensity on photosynthesis and photoprotective mechanisms in apple under progressive drought |
| topic | apple drought stress photosynthesis photoprotection |
| url | http://www.sciencedirect.com/science/article/pii/S2095311915611480 |
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