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Drought tolerance of cowpea enhanced by exogenous application of methyl
jasmonate
Omid Sadeghipour*
Department of Agronomy, Yadegar-e-Imam Khomeini (RAH) Shahre Rey Branch,
Islamic Azad University, 18155/144, Tehran, Iran.
*Corresponding author (e-mail:
osadeghipour@yahoo.com)
Abstract
Drought stress limits crop productivity in many regions of the world.
Methyl jasmonate (MeJA) a plant growth regulator is involved in many plant
growth and developmental processes and tolerance to environmental
stresses. This field experiment was conducted to investigate the role of
exogenous application of MeJA (seed priming, foliar application at the
vegetative or reproductive stages and the combination of them) in
alleviating the adverse effects of drought stress in cowpea. Results
showed that drought stress severely reduced growth attributes such as
plant height, leaf area, biomass and seed yield as well as stomatal
conductance, relative water content (RWC) and chlorophyll value. Drought
also increased membrane lipid peroxidation (malondialdehyde
''MDA'' content), proline and total soluble sugars (TSS) contents. On the
other hand, exogenously applied of MeJA improved all growth attributes
under drought stress conditions through stomata closure and improving RWC,
enhancing chlorophyll value, proline and TSS contents and also reduction
of membrane lipid peroxidation. Among MeJA treatments, foliar application
at the reproductive stage was the most effective. These results suggest
the involvement of MeJA in increasing drought tolerance of cowpea by
improving water status and chlorophyll value, enhancing compatible solutes
accumulation and reducing membrane lipid peroxidation.
Keywords:
Foliar application; Jasmonates; Legumes; Seed priming; Water stress.
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Response of yield and yield components of chickpea to Fe foliar
fertilization
Siros Ekhtiari1* and Soheil Kobraee1
1Department
of Agronomy and Plant Breeding Kermanshah Branch, Islamic Azad
University, Kermanshah, Iran.
*Corresponding author (e-mail:
S.ekhtiari@yahoo.com)
Abstract
This study investigated response of Fe concentrations in shoot and seed,
yield and yield components of chickpea cultivars to iron foliar
fertilization. The experimental design was set
up in split plot in randomized complete block with three
replications. The main plot includes three Fe foliar treatment and four
chickpea cultivars which are replaced in sub plot. At harvest, seed yield
and its components, pod, seed and total dry weight, and seed protein
content were measured. The Fe content was determined by Atomic Absorption
Spectrometry. According to the results, Fe spraying had significant effect
on the iron concentrations in shoots and seeds, dry weight of seed and
total plant, number of pod per plant,100 seed weight and seed yield at 1%
level and pod dry weight at 5% level.
Based on the results, Fe foliar application at flowering stage compared to
control treatments significantly increased number of pod 34.0% and seed
19.0% per plant. The highest 100 seed weightwas observed in Fe foliar
fertilization at pod set stagewhile, the
highest seed yieldobtained when iron was applied at flowering
stage.Compared to control treatment, iron foliar fertilization at pod set
stage significantly increased the Fe concentrations in shoots and seeds
by, 142.9% and 181.7%, respectively.
Keyword:
Chickpea, concentration, fertilizer, flowering stage, iron
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