Effect of sodium nitroprusside on post harvest keeping quality of gladiolus spikes
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Date
2018
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Punjab Agricultural University, Ludhiana
Abstract
The present investigation entitled “Effect of sodium nitroprusside on post harvest keeping quality of
gladiolus spikes” was undertaken in Research Farms of Floriculture and Laboratories of Botany of
Punjab Agricultural University during the year 2016-18. The spikes of gladiolus var. Punjab Glad-1
were pulsed for 20 hrs with SNP solutions (100 mg l-1, 200 mg l-1, 300 mg l-1 and 400 mg l-1) alone and
in combination with sucrose (20%) and aluminium sulphate (400 mg l-1) and held in SNP solutions (50
mg l-1, 100 mg l-1, 150 mg l-1 and 200 mg l-1) alone and in combination with sucrose (2%) and
aluminium sulphate (400 mg l-1). The pulsing solutions of SNP @ 100 mg l-1 and 200 mg l-1 and
holding solutions containing SNP@50 mg l-1 and 100 mg l-1 significantly hastened the opening of basal
floret, increased size, number of florets open at one time, per cent opening of florets, vase life,
water/solution absorbed and decreased the pH of solutions whereas pulsing with SNP @ 400 mg l-1 or
holding spikes in 200 mg l-1 SNP adversely affected the quality parameters. Further, to have an insight
into concentration dependent response of SNP, the physiological and biochemical analysis of florets of
spikes treated with four pulsing SNP solutions viz. 100 mg l-1, 200 mg l-1 supplemented with sucrose
and aluminium sulphate, 300 mg l-1 and 400 mg l-1 and four holding SNP solutions viz. 50 mg l-1, 100
mg l-1 supplemented with sucrose and aluminium sulphate, 150 mg l-1 and 200 mg l-1 was done at four
developmental stages. The results pertaining to membrane stability index, relative water content, total
soluble sugars, total protein content, catalase and peroxidase activity supported the results of keeping quality parameters. Thus, sodium nitroprusside @200 mgl-1 with sucrose and aluminium sulphate could be used as pulsing and @100 mgl-1 with sucrose and aluminium sulphate as holding solution to improve the post harvest quality of spike.
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