ROLE OF NITRIC OXIDE IN ALLEVIATING LIME INDUCED IRON CHLOROSIS IN GROUNDNUT (Arachis hypogaea L.)
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Date
2015-06
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University of Agricultural Sciences Dharwad
Abstract
A field experiment was conducted during kharif, 2014 at Main Agricultural Research Station, Dharwad to study the role of sodium nitroprusside (SNP) a donor of nitric oxide (NO) in combination with ferrous sulphate in alleviation mechanism of iron chlorosis in groundnut genotypes grown on calcareous soil. The experiment was laid out in split-plot design with three genotypes viz., GPBD-4, TMV-2 and GPBD-6 and five treatment combinations of foliar and soil applications of SNP and FeSO4 viz., SNP @ 5.63 mg+ FeSO4 @ 18.9 mg /g of urea at the time of sowing (0.31kg SNP ha-1 + 1.03kg FeSO4 ha-1), Foliar application of SNP @ 6mM (1.78g litre-1), Foliar spray of FeSO4 @ 0.5% (5g litre-1), Foliar spray SNP @ 6mM + FeSO4 @ 0.5%, Foliar water spray (Control).
The results revealed that lime induced iron chlorosis was 32 per cent with the pod yield reduction of 25 per cent. All the morpho-physiological traits, growth, yield and yield attributes were found to be reduced due to iron deficiency. Chlorophyll content, leaf ferrous content and SPAD values were also reduced. The combination of FeSO4 and SNP both in soil and foliar applications allevi¬ated leaf interveinal chlorosis and increased the activity of root Fe3+ reductase and the concentration of available iron in soil and leaf suggesting that NO action could be related to iron availability in the rhizosphere and the plant.
These results suggest that combined foliar application SNP and FeSO4 could alleviate iron deficiency induced chlorosis of groundnut in calcareous soil. Among genotypes GPBD-4 and GPBD-6 had higher leaf ferrous iron, chlorophyll content and ferric reductase activity and were found iron efficient genotypes.
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