Abstract
Background. Drought is one of the most important factors affecting plant growth and productivity. The study addressed the perspectives of usage of salicylic acid, a stress protective compound, to increase the adaptive potential of Triticum aestivum L. plants under drought conditions. The effect of salicylic acid on the photosynthetic apparatus of wheat plants under the conditions of drought with a subsequent gradual resumption of watering was investigated. Materials and methods. Plants of the Podolyanka variety of wheat (Triticum aestivum L.) were the objects of our study. Seeds were pre-soaked in a solution of salicylic acid (50 mM) for 3 h. First seeds germinated in an incubator, and on the 3rd day of growth were transplanted into plastic pots (d = 14 cm). Plants were grown on soil substrate, whose humidity was maintained at 60 % of full moisture capacity – the optimal water supply. The model of drought was created by the simultaneous cessation of irrigation (30 % of soil moisture capacity) for 12 days. Upon termination of the drought, soil moisture in the pots was adjusted to 60 % of its full capacity. The control plants were grown from the seeds not treated with salicylic acid under conditions of optimal water supply (60 %). Study samples were taken from the shoots of wheat on the 7th, 9th and 12th days of the drought period and on the first day after the resumption of irrigation (14 days). The concentrations of TBA-active products, chlorophyll, carotenoids, glucose, sucrose and chlorophyllase activity were determined. Results. The influence of salicylic acid on the content of chlorophyll, carotenoids and TBA-active products along with chlorophyllase activity in shoots of wheat under the drought conditions on the early stages of ontogenesis was determined. It was found that both drought and salicylic acid modify the content of chlorophyll and carotenoids in the shoots of Triticum aestivum L., apparently by altering their metabolism. Chlorophyllase plays an important role in the adaptation of photosynthetic apparatus to the drought conditions. Our results suggest that salicylic acid causes an increase in the content of photosynthetic pigments and a decrease in chlorophyllase activity in drought conditions. In addition, salicylate causes the accumulation of glucose and sucrose in the shoot tissues of wheat plants under stressful conditions. Conclusions. Our research suggests participation of salicylic acid in the plants’ adaptation processes under the conditions of moisture deficiency. It was also found that under the effect of salicylic acid the content of TBA-active products decreases in the plant shoots under the conditions of drought. Considering the fact that the content of TBA-active products is an important indicator of lipid peroxidation intensity, the decrease of this index reveals the reduced activity of free radical processes in plant tissues under the effect of salicylic acid. Thus, it can be assumed that SA has a positive effect on plant metabolism under drought conditions.
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Claims 7
Claim · model-written summary
Drought and salicylic acid modified chlorophyll and carotenoid contents.
- Taxon
- Triticum aestivum L.
Triticum aestivume0 - Organ / stage
- shootse0
- Treatment
- drought and salicylic acide0
- Outcome
- content of chlorophyll and carotenoidse0
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“both drought and salicylic acid modify the content of chlorophyll and carotenoids in the shoots of Triticum aestivum L.”
Claim · model-written summary
Salicylic acid increased photosynthetic pigment content under drought.
- Taxon
- Triticum aestivum L.Triticum aestivume1
- Treatment
- salicylic acide0
- Outcome
- content of photosynthetic pigmentse0
- Direction
- increasee0
- Qualifier
- drought conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salicylic acid causes an increase in the content of photosynthetic pigments and a decrease in chlorophyllase activity in drought conditions.”
e1“shoots of Triticum aestivum L.”
Claim · model-written summary
Salicylic acid reduced chlorophyllase activity under drought.
- Taxon
- Triticum aestivum L.Triticum aestivume1
- Treatment
- salicylic acide0
- Gene
- chlorophyllasee0
- Outcome
- chlorophyllase activitye0
- Direction
- decreasee0
- Qualifier
- drought conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salicylic acid causes an increase in the content of photosynthetic pigments and a decrease in chlorophyllase activity in drought conditions.”
e1“shoots of Triticum aestivum L.”
Claim · model-written summary
Salicylate increased glucose accumulation in wheat shoots under stress.
- Taxon
- wheatTriticum aestivume0
- Organ / stage
- shoot tissuese0
- Treatment
- salicylatee0
- Outcome
- accumulation of glucosee0
- Direction
- accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salicylate causes the accumulation of glucose and sucrose in the shoot tissues of wheat plants under stressful conditions.”
Claim · model-written summary
Salicylate increased sucrose accumulation in wheat shoots under stress.
- Taxon
- wheatTriticum aestivume0
- Organ / stage
- shoot tissuese0
- Treatment
- salicylatee0
- Outcome
- sucrosee0
- Direction
- accumulatione0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“salicylate causes the accumulation of glucose and sucrose in the shoot tissues of wheat plants under stressful conditions.”
Claim · model-written summary
Salicylic acid decreased TBA-active products in shoots under drought.
- Taxon
- Triticum aestivum L.Triticum aestivume1
- Organ / stage
- plant shootse0
- Treatment
- salicylic acide0
- Outcome
- content of TBA-active productse0
- Direction
- decreasese0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“under the effect of salicylic acid the content of TBA-active products decreases in the plant shoots under the conditions of drought.”
e1“shoots of Triticum aestivum L.”
Claim · model-written summary
Authors interpreted lower TBA-active products as reduced free-radical activity.
- Taxon
- Triticum aestivum L.Triticum aestivume2
- Treatment
- salicylic acide0
- Outcome
- reduced activity of free radical processese0
- Qualifier
- lipid peroxidation intensitye1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the decrease of this index reveals the reduced activity of free radical processes in plant tissues under the effect of salicylic acid.”
e1“content of TBA-active products is an important indicator of lipid peroxidation intensity”
e2“shoots of Triticum aestivum L.”
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