Abstract
Optimum water availability at different growth stages is one the major prerequisites of best growth and yield production of plants. Exogenous application of plant growth regulators considered effective for normal functioning of plants under water-deficit conditions. A study was conducted to examine the influence of exogenously applied L-methionine on sunflower ( Helianthus annuus L.) plants grown under water-deficit conditions. Twenty-five-day old seedlings of four sunflower cultivars, FH331, FH572, FH652 and FH623 were exposed to control (100% F.C.) and drought stress (60% F.C.) conditions. After 30-day of drought stress, L-methionine (Met; 20 mg/L) was applied as a foliar spray to control and drought stressed plants. Water deficit stress significantly reduced shoot fresh and dry weights shoot and root lengths, and chlorophyll a content in all four cultivars. While a significant increase was observed due to water deficiency in relative membrane permeability (RMP), malondialdehyde (MDA), total soluble proteins (TSP), total soluble sugars (TSS), ascorbic acid (AsA) and activity of peroxidase (POD). Although, exogenously applied Met was effective in decreasing RMP, MDA and H 2 O 2 contents, it increased the shoot fresh weight, shoot length, chlorophyll a , chlorophyll a/b ratio, proline contents and the activities of SOD, POD and CAT enzymes in all four cultivars under water deficit stress. No change in AsA and total phenolics was observed due to foliar-applied Met under water stress conditions. Of all sunflower cultivars, cv. FH-572 was the highest and cv. FH-652 the lowest of all four cultivars in shoot fresh and dry weights as well as shoot length under drought stress conditions. Overall, foliar applied L-methionine was effective in improving the drought stress tolerance of sunflower plants that was found to be positively associated with Met induced improved growth attributes and reduced RMP, MDA and H 2 O 2 contents under water deficit conditions.
Abstract from the paper’s OpenAlex record; open copy licensed cc-by-sa. Read at the source ↗
The text the model read, with the source record’s inline markup (italics, sub- and superscripts) rendered and its character entities decoded; quote offsets refer to the raw text.
Claims 7
Claim · model-written summary
Water deficit reduced growth traits and chlorophyll a across four sunflower cultivars.
- Taxon
- sunflower
Helianthus annuust0 - Treatment
- Water deficit stresse0
- Outcome
- shoot fresh and dry weights shoot and root lengths, and chlorophyll a contente0
- Direction
- reducede0
- Qualifier
- in all four cultivarse0
- Comparator
- control (100% F.C.)t1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Water deficit stress significantly reduced shoot fresh and dry weights shoot and root lengths, and chlorophyll a content in all four cultivars”
t0“sunflower”
t1“control (100% F.C.)”
Claim · model-written summary
Water deficit increased membrane permeability, oxidative damage, solutes, ascorbic acid and POD activity.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- water deficiencye0
- Outcome
- relative membrane permeability (RMP), malondialdehyde (MDA), total soluble proteins (TSP)e0
- Direction
- increasee0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“a significant increase was observed due to water deficiency in relative membrane permeability (RMP), malondialdehyde (MDA), total soluble proteins (TSP), total soluble sugars (TSS), ascorbic acid (AsA) and activity of peroxidase (POD)”
t0“sunflower”
Claim · model-written summary
Methionine decreased RMP, MDA and hydrogen peroxide under drought.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- exogenously applied Mete0
- Outcome
- RMP, MDA and H 2 O 2 contentse0
- Direction
- decreasinge0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“exogenously applied Met was effective in decreasing RMP, MDA and H 2 O 2 contents”
t0“sunflower”
Claim · model-written summary
Methionine increased shoot fresh weight, shoot length and chlorophyll traits under drought.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Mett1
- Outcome
- shoot fresh weight, shoot length, chlorophyll ae0
- Direction
- increasede0
- Qualifier
- under water deficit stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it increased the shoot fresh weight, shoot length, chlorophyll a , chlorophyll a/b ratio, proline contents and the activities of SOD, POD and CAT enzymes in all four cultivars under water deficit stress”
t0“sunflower”
t1“exogenously applied Met”
Claim · model-written summary
Methionine increased proline and antioxidant enzyme activities under drought.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- Mett1
- Outcome
- proline contents and the activities of SOD, POD and CAT enzymese0
- Direction
- increasede0
- Qualifier
- under water deficit stresse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“it increased the shoot fresh weight, shoot length, chlorophyll a , chlorophyll a/b ratio, proline contents and the activities of SOD, POD and CAT enzymes in all four cultivars under water deficit stress”
t0“sunflower”
t1“exogenously applied Met”
Claim · model-written summary
Foliar methionine did not change ascorbic acid or total phenolics under water stress.
- Taxon
- sunflowerHelianthus annuust0
- Treatment
- foliar-applied Mete0
- Outcome
- AsA and total phenolicse0
- Direction
- No changee0
- Qualifier
- under water stress conditionse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No change in AsA and total phenolics was observed due to foliar-applied Met under water stress conditions”
t0“sunflower”
Claim · model-written summary
FH-572 ranked highest and FH-652 lowest for shoot weights and length during drought.
- Taxon
- sunflowerHelianthus annuust0
- Material
- cv. FH-572e0
- Outcome
- shoot fresh and dry weights as well as shoot lengthe0
- Direction
- higheste0
- Qualifier
- under drought stress conditionse0
- Comparator
- cv. FH-652e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“cv. FH-572 was the highest and cv. FH-652 the lowest of all four cultivars in shoot fresh and dry weights as well as shoot length under drought stress conditions”
t0“sunflower”
The same questions in other papers
application · quality: phytochemicals · Helianthus annuus (common sunflower)Positive and negative results
1 paper in the same direction as this paper · 6 in the opposite direction
- positive
- positive
- positive
4 papers more in this group
See all 8 papers →drought · physiology: pigments · Helianthus annuus (common sunflower)Positive and negative results
17 papers in the same direction as this paper · 1 in the opposite direction
- positive
- negative
- negative
15 papers more in this group
See all 19 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.