Development of photosynthetic electron transport reactions under the influence of phytohormones and nitrate nutrition in greening cucumber cotyledons |
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Authors: | M D Pedhadiya P P Vaishnav Y D Singh |
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Institution: | (1) Department of Biosciences, Saurashtra University, 360 005 Rajkot, India |
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Abstract: | Development of the photosynthetic electron transport system, under the influence of hormones and nitrate-nutrition, in greening cucumber cotyledon was investigated. Both photosystems, PS I measured as DCPIP MV, and PS II as H2O pBQ, were significantly promoted by GA and kinetin with kinetin being more effective. PS II/PS I ratio, though increased in control, did not change significantly with GA or kinetin treatment. Other partial reactions (H2O MV/K3Fe(CN)6/NADP) were also promoted. Addition of KNO3 showed concentration-dependent effects on growth and photosynthetic electron transport reactions (H2O MV/K3Fe(CN)6/NADP). It is concluded that both hormones and nutritional status influence development of the photosynthetic electron transport system in greening cucumber cotyledons.Abbreviations PS I
Photosystem I
- PS II
Photosystem II
- BSA
Bovine Serum Albumin
- DCMU
3-(3,4-Dichlorophenyl)-1,1-Dimethyl Urea
- DCPIP
2,6-Dichlorophenol Indophenol
- EDTA
Ethylene Diamine Tetra-acetic Acid
- GA
Gibberellic acid (GA3)
- HEPES
(N-2-Hydroxyethyl Piperazine-N-2-Ethanesulphonic Acid)
- IAA
Indole-3-acetic acid
- MV
Methyl Viologen
- NADP
Nicotinamide Adenine Dinucleotide Phosphate
- pBQ
p-benzoquinone |
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Keywords: | gibberellin cytokinin photosynthetic electron transport nitrate cucumber cotyledon |
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