Interspecific Difference in Boron tolerance at Seed Germination Stage in three Hibiscus species
Journal Title: Journal of Plant Science and Research - Year 2016, Vol 3, Issue 2
Abstract
Influence of boron toxicity on seed germination, seedling growth and activities of two antioxidant enzymes in three Hibiscus species namely, Hibiscus cannabinus L., Hibiscus sabdariffa L. and Hibiscus tiliaceus L. was investigated. Germination percentage of all the three Hibiscus species was decreased due to higher ‘B’ concentration (200 ppm). Higher dose of boron (200 ppm) caused marked reduction in germination percentage in H. tiliaceus (86%) and H. cannabinus (20%) while, in case of H. sabdariffa (2%) decline in germination percentage was evident. Root length of all the three Hibiscus species was declined due to higher concentration of boron (200 ppm). Root length of the three Hibiscus species was affected under ‘B’ stress in the order H. cannabinus > H. sabdariffa > H. tiliaceus. Shoot length was also similarly reduced due to 200 ppm ‘B’ concentration but the order of decrease was H. tiliaceus > H. sabdariffa > H. cannabinus. Higher dose (200 ppm) of boron concentration reduced the total seedling length in all three Hibiscus species. The percent reduction in seedling length at 200 ppm ‘B’ concentration was in the order H. tiliaceus > H. sabdariffa > H. cannabinus. Considerable reduction in vigour index of all the three Hibiscus species was noticed in response to 200 ppm ‘B’ treatment in following order H. tiliaceus > H. cannabinus > H. sabdariffa. Decrease in fresh weight per seedling of H. cannabinus and H. sabdariffa was noticed under ‘B’ toxicity while, in H. tiliaceus there was slight increase in fresh weight at 100 ppm ‘B’ concentration and thereafter it was decreased. Catalase and peroxidase activities in seedlings of H. sabdariffa were greatly enhanced due to 150 ppm and 200 ppm ‘B’ treatment respectively. Lower dose (100 ppm) caused slight increase in catalase activity of both H. cannabinus and H. tiliaceus seedlings. The activity of enzyme peroxidase was reduced in seedlings of H. cannabinus and H. tiliaceus over entire range of ‘B’ treatment. Thus an interspecific difference in boron tolerance at germination stage was evident in the three Hibiscus species.
Authors and Affiliations
Babu A Sonar
Keywords
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