scholarly journals Changes in morphological and physiological characteristics of sunflower (Helianthus annuus L.) hybrids in relation to the water deficit stress

2014 ◽  
Vol 9 (30) ◽  
pp. 2324-2331 ◽  
Author(s):  
Alahdadi Iraj ◽  
Oraki Hussein ◽  
Parhizkar khajani Fataneh
Keyword(s):  
Helianthus Annuus ◽  
Water Deficit ◽  
Physiological Characteristics ◽  
Water Deficit Stress ◽  
Helianthus Annuus L

scholarly journals Methionine-induced regulation of growth, secondary metabolites and oxidative defense system in sunflower (Helianthus annuus L.) plants subjected to water deficit stress

PLoS ONE ◽  
2021 ◽  
Vol 16 (12) ◽  
pp. e0259585
Author(s):  
Gull Mehak ◽  
Nudrat Aisha Akram ◽  
Muhammad Ashraf ◽  
Prashant Kaushik ◽  
Mohamed A. El-Sheikh ◽  
...  
Keyword(s):  
Drought Stress ◽  
Helianthus Annuus ◽  
Water Deficit ◽  
Soluble Sugars ◽  
Foliar Spray ◽  
Shoot Length ◽  
Stress Conditions ◽  
Growth And Yield ◽  
Water Deficit Stress ◽  
Growth Stages

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 H2O2 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 H2O2 contents under water deficit conditions.

Investigation of the limitations to photosynthesis induced by leaf water deficit in field-grown sunflower (Helianthus annuus L.)

1990 ◽  
Vol 13 (9) ◽  
pp. 923-931 ◽  
Author(s):  
R. R. WISE ◽  
J. R. FREDERICK ◽  
D. M. ALM ◽  
D. M. KRAMER ◽  
J. D. HESKETH ◽  
...  
Keyword(s):  
Helianthus Annuus ◽  
Water Deficit ◽  
Leaf Water ◽  
Helianthus Annuus L ◽  
Leaf Water Deficit
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