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Studies on effects of exogenous application of polyamines on growth and physiochemical changes in Troyer citrange under NaCl stress

KrishiKosh

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Title Studies on effects of exogenous application of polyamines on growth and physiochemical changes in Troyer citrange under NaCl stress
M Sc
 
Creator SOYIMCHITEN
 
Contributor A. K. Dubey
 
Subject amines, planting, vegetative propagation, fruits, food preservation, concentrates, biological development, chlorophylls, enzymes, irrigation
 
Description T-8391
The present investigation was conducted under polyhouse at the Division of Fruits and Horticultural Technology, I.A.R.I. New Delhi during 2009-10. The experiment was conducted with two levels each of salt i.e. 0.0 or 50 mM NaCl and polyamines 0.0 mM or 1mM of putrescine (Put), spermidine (Spd) and spermine (Spm) on salt susceptible citrus rootstock Troyer citrange. Polyamines were applied as foliar application at seven days interval. The plants were irrigated with tap water or water containing 50 mM NaCl at weekly interval. Results revealed that NaCl stress treatment reduced plant height, number of leaves and dry mass of shoot and root. While, salinity increased accumulation of toxic element like Na+ and Cl- and decreased the concentration of beneficial element like K+ in both root and leaf tissues. Furthermore, Troyer citrange root accumulated more Na+ than leaf. Salt stress also enhanced the activities of antioxidant enzyme like SOD, POD and CAT activities, proline content and phenol accumulation and MII under NaCl stress.
Exogenous polyamines were found effective in mitigation of salt stress effect. PAs reduced level of Na+ and Cl- and enhanced the level of K+, Ca2+ and Mg2+ in leaf and root tissues resulting improvement in plant height, number of leaves and dry mass of shoot and root under both saline and non saline condition. Polyamines mainly Spm and Spd were found more effective in restricting the accumulation of Na+ and increasing the level of K+ and Mg+2. However, Put had more pronounced effect on restricting Cl- accumulation in leaf tissues under saline condition. Further, exogenous PAs improved RWC and chlorophyll fractions in the stressed seedlings. The maximum improvement in RWC and chlorophyll fractions was found with exogenous application of Spm. Lower
MII in saline and non saline condition was recorded with Spm and Spd, respectively. Exogenous application of Spm and Spd also had higher activity of SOD, POD and CAT under both saline and non saline conditions. While proline accumulation was found higher in seedlings treated with Spm.
 
Date 2016-11-01T09:56:29Z
2016-11-01T09:56:29Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/83072
 
Format application/pdf
 
Publisher IARI , DIVISION OF FRUITS AND HORTICULTURAL TECHNOLOGY