ROLE OF SODIUM NITROPRUSSIDE ON MITIGATION OF SALT STRESS IN SWEET CORN
2017
Manshoorı, Fateme | Armın, Mohammad | Marvı, Hamid
To evaluate the effect of foliar application of sodium nitroprusside (SNP) on physiological characteristics of sweet corn under salt stress a factorial experiment in completely randomized design with three replications was conducted in the research greenhouse of Islamic Azad University of Sabzevar. Factors were application time of SNP at the concentrations of 200 ppm (vegetative, reproductive and vegetative + reproductive) and salinity (0,1.5, 3 and 4.5 dS m-1). The results showed that increasing salinity levels from 0 to 4.5 dSm-1 decreased the height by 31.81%, plant dry weight by 34.34%,the number of ear by 46.34%, chlorophyll a content by 30.54%, chlorophyll b content by 55.81%, carotenoid content by 37.40%, total chlorophyll content and the amount of potassium by 54.86% and increased the amount of sodium by 63.86%. Application of sodium nitroprusside twice in vegetative and reproductive stage resulted in maximum height, plant dry weight,chlorophyll a, chlorophyll b, total chlorophyll and foliar application had higher levels of carotenoids. Overall the results indicated that sweet corn is sensitive to salinity and cannot tolerate salinity more than 3 dS m-1. At low salinity condition SNP foliar application at vegetative + reproductive stage and in high salinity level at the vegetative stage can reduce the effects of salinity.
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