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The effect of ascorbic acid and salicylic acid foliar on vegetative properties and yield and yield components of Vigna unguiculata L. under drought stress
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Jaleh Akbari   , Abbas Maleki * |
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Abstract: (4237 Views) |
Abstract
Introduction: Vigna unguiculata L. is one of the oldest beans with highly nutrition value, having about 25 protein types, delicious with short cooking time. Among the environmental factors affecting the growth and yield of crops and medicinal plants, dryness is the most important factor in reducing production, especially in arid and semi-arid regions. Salicylic acid is an internal growth regulator of the natural from phenolic compounds group that plays a role in regulating the physiological processes of the plant. On the other hand, ascorbic acid is also an important antioxidant that protects the plant from free oxidizing radicals.
Materials and methods: In order to investigate the effect of ascorbic acid and salicylic acid on vegetative characteristics and yield and yield components of Vigna unguiculata L. under drought stress, an experiment was conducted in Kermanshah Mahidasht district at 2012. The experiment was as a split factorial based on randomized complete block design with 3 replications. The main drought stress factor including 1) drought stress or 60% evaporation from class A evaporation pan, 2) medium stress or 90% evaporation from class A evaporation pan and 3) severe stress or 120% evaporation from class A evaporation pan and the substrate foliar factor including 1) salicylic acid spraying in 2 levels (non-consumption and spraying at 8-12 leaf stage with 1 mM concentration) and 2) ascorbic acid spraying at 2 levels (non-consumption and spraying at 12 leaf stage with 1 mM concentration).
Results: The results of this study showed that the effect of drought stress on the most traits was significant and reduced these traits. Also, the effect of salicylic acid and ascorbic acid on the most traits was significant and their application increased the traits under both favorable irrigation and water stress conditions. The highest grain yield was obtained in treatment of non-stress and combined with salicylic acid and ascorbic acid (2425.1 kg/ha), which had a significant difference with most treatments. The lowest grain yield was obtained in treatment of severe stress and non-consumption of salicylic acid and ascorbic acid with 974.9 kg/ha. The results of the mean comparison indicated that the highest number of seeds per plant was obtained in treatment of moderate stress and combined with salicylic acid and ascorbic acid with 844.4, which had a significant difference with most treatments. The lowest number of seeds per plant was obtained in treatment of severe stress and no salicylic acid and ascorbic acid (169.8).
Conclusion: It seems that the two factors of spraying by reducing the adverse effects of drought stress and reducing the harmful oxidative effects and, finally, better water supply in the plant, initially improved vegetative and reproductive traits and through improving the traits related to yield have been able to increase grain yield.
Keywords: Yield Components, Salicylic Acid, Drought Stress, Beans |
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Full-Text [PDF 1412 kb]
(1479 Downloads)
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Type of Study: Research |
Subject:
Ecophysiology
Received: 2018/07/3 | Accepted: 2018/07/3 | Published: 2018/07/3
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