Abstract
Abstract Strawberry seedlings are often subjected to strong light stress during breeding and strawberry production, leading to seedling death, sunburn and disease. We investigated the endogenous mechanism of strong light stress in strawberry by studying chlorophyll degradation. The activity of chlorophyll, intermediate products, chlorophyll degradation key enzymes and the expression of chlorophyll degradation related genes were measured in ‘Xuelixiang’ strawberry (Fragaria × ananassa Duch.) under 12 hours of 30 000 xl and 100 000 xl light treatment respectively. It was found that the concentrations of chlorophyll, chlorophyll a and chlorophyll b in strawberry leaves decreased significantly and the ratio of chlorophyll a to b increased under strong light stress treatment; pheophytin pheophorbide hydrolase (PPH), pheophorbide a oxygenase (PAO) and red chlorophyll catabolite reductase (RCCR) activities were higher than those in the NL group; chlorophyll degradation-related genes (except FaMDCase) were all higher expressed than in the NL group. The degradation of strawberry chlorophyll was accelerated by strong light stress. In addition, showing that PPH and PAO are key factors in the chlorophyll degradation pathway of strawberry. This study lays the foundation for an in-depth study on chlorophyll degradation in strawberry under strong light stress and other related studies, aiming to provide a theoretical basis for light management during strawberry production.
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Claims 8
Claim · model-written summary
Strong light stress significantly decreased chlorophyll, chlorophyll a and chlorophyll b concentrations in strawberry leaves.
- Taxon
- strawberry
_single2.jpg?width=60)
Fragaria ×ananassae1 - Organ / stage
- leavese1
- Treatment
- strong light stresse1
- Outcome
- concentrations of chlorophyll, chlorophyll a and chlorophyll be1
- Direction
- decreasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
_single2.jpg?width=500)
Verbatim
e1“the concentrations of chlorophyll, chlorophyll a and chlorophyll b in strawberry leaves decreased significantly and the ratio of chlorophyll a to b increased under strong light stress treatment”
Claim · model-written summary
Strong light stress increased the ratio of chlorophyll a to b in strawberry leaves.
- Taxon
- strawberryFragaria ×ananassae1
- Organ / stage
- leavese1
- Treatment
- strong light stresse1
- Outcome
- ratio of chlorophyll a to be1
- Direction
- increasede1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the concentrations of chlorophyll, chlorophyll a and chlorophyll b in strawberry leaves decreased significantly and the ratio of chlorophyll a to b increased under strong light stress treatment”
Claim · model-written summary
Under strong light stress, PPH activity was higher in strawberry than in the NL group.
- Taxon
- strawberryFragaria ×ananassae1
- Treatment
- strong light stresse1
- Gene
- pheophytin pheophorbide hydrolase (PPH)e2
- Outcome
- activitiese2
- Direction
- highere2
- Comparator
- NL groupe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the concentrations of chlorophyll, chlorophyll a and chlorophyll b in strawberry leaves decreased significantly and the ratio of chlorophyll a to b increased under strong light stress treatment”
e2“pheophytin pheophorbide hydrolase (PPH), pheophorbide a oxygenase (PAO) and red chlorophyll catabolite reductase (RCCR) activities were higher than those in the NL group”
Claim · model-written summary
Under strong light stress, PAO activity was higher in strawberry than in the NL group.
- Taxon
- strawberryFragaria ×ananassae1
- Treatment
- strong light stresse1
- Gene
- pheophorbide a oxygenase (PAO)e2
- Outcome
- activitiese2
- Direction
- highere2
- Comparator
- NL groupe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the concentrations of chlorophyll, chlorophyll a and chlorophyll b in strawberry leaves decreased significantly and the ratio of chlorophyll a to b increased under strong light stress treatment”
e2“pheophytin pheophorbide hydrolase (PPH), pheophorbide a oxygenase (PAO) and red chlorophyll catabolite reductase (RCCR) activities were higher than those in the NL group”
Claim · model-written summary
Under strong light stress, RCCR activity was higher in strawberry than in the NL group.
- Taxon
- strawberryFragaria ×ananassae1
- Treatment
- strong light stresse1
- Gene
- red chlorophyll catabolite reductase (RCCR)e2
- Outcome
- activitiese2
- Direction
- highere2
- Comparator
- NL groupe2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the concentrations of chlorophyll, chlorophyll a and chlorophyll b in strawberry leaves decreased significantly and the ratio of chlorophyll a to b increased under strong light stress treatment”
e2“pheophytin pheophorbide hydrolase (PPH), pheophorbide a oxygenase (PAO) and red chlorophyll catabolite reductase (RCCR) activities were higher than those in the NL group”
Claim · model-written summary
Under strong light stress, chlorophyll degradation-related genes (except FaMDCase) were more highly expressed in strawberry than in the NL group.
- Taxon
- strawberryFragaria ×ananassae1
- Treatment
- strong light stresse1
- Outcome
- chlorophyll degradation-related genese3
- Direction
- higher expressede3
- Qualifier
- except FaMDCasee3
- Comparator
- NL groupe3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“the concentrations of chlorophyll, chlorophyll a and chlorophyll b in strawberry leaves decreased significantly and the ratio of chlorophyll a to b increased under strong light stress treatment”
e3“chlorophyll degradation-related genes (except FaMDCase) were all higher expressed than in the NL group”
Claim · model-written summary
Strong light stress accelerated the degradation of strawberry chlorophyll.
- Taxon
- strawberryFragaria ×ananassae4
- Treatment
- strong light stresse4
- Outcome
- degradation of strawberry chlorophylle4
- Direction
- acceleratede4
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e4“The degradation of strawberry chlorophyll was accelerated by strong light stress”
Claim · model-written summary
PPH and PAO are key factors in the chlorophyll degradation pathway of strawberry.
- Taxon
- strawberryFragaria ×ananassae5
- Gene
- PPH and PAOe5
- Outcome
- chlorophyll degradation pathwaye5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e5“showing that PPH and PAO are key factors in the chlorophyll degradation pathway of strawberry”
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