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Response of mango (Mangifera indica L.) seedlings to polyamines under salt stress

KrishiKosh

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Title Response of mango (Mangifera indica L.) seedlings to polyamines under salt stress
 
Creator KANCHAN LATA
 
Contributor Manish Srivastav
 
Subject ---
 
Description t-8150
The present investigation entitled “Response of mango ( Mangifera indica L.)
seedlings to polyamines under salt stress.” was carried out during 2008-2009 at the
Division of Fruits and Horticultural Technology, Indian Agricultural Research Institute,
New Delhi. Studies were conducted on polyembryonic cv. Kurukan and
Monoembryonic mango plants (Non-descript) in pots. Salt treatment was given twice at
7 days interval after 30 days of transplanting. One litre solution of 150 mM NaCl was
poured in pots twice at 7 days interval. Each treatment was replicated ten times. Plants
grown in pots were again treated twice with 60 x 10-2 mM putrescine and 70 x 10-2 mM
spermidine at 7 days interval.
Regardless of salinity and rootstocks, the application of polyamines improved
vegetative growth of mango plants. It was evident that effect of spermidine was more
pronounced than putrescine in improving vegetative growth of both mango rootstocks.
NaCl treatment with or without polyamines showed significant reduction in secondary
roots of both mango rootstocks. However, applications of polyamines have increased
the number of secondary roots per plant in both rootstocks under salt stress. Salt-treated
plants showed very high degree of defoliation than non-salt-treated plants. Defoliation
was significantly reduced by application of spermidine (2.18 folds decrease) and
putrescine (1.54 folds decrease). Salt treatment in both mango rootstocks has resulted in
reduction of beneficial mineral nutrient like K+
, Ca++, Fe++, Zn++ and Mg++ and
increased Na+
and Cl-
levels in leaves. It was interesting to note that treatment of salt
stressed mango rootstocks by polyamines significantly increased K+
, Ca++, Fe++, Zn++
and Mg++ in the tissues and reduced uptake and accumulation of toxic ions like Na+
and
Cl-
. Salt treatment caused more damage to membrane on all dates compared to non-salt-
treated mango plants. It was also interesting to note that with increase in the age the
membrane injury index increased significantly compared to non-salt-treated condition.
However, application of polyamines significantly reduced MII in both rootstocks under
salt-treated condition. Modulating effect of polyamines on mango plants under salt
stress may be attributed to increased photosynthetic pigments, relative water content,
proline accumulation, potassium and calcium uptake and accumulation and enhanced
activities of antioxidant enzymes and by reducing membrane injury and sodium and
chloride uptake and accumulation in mango plants.
 
Date 2016-12-22T11:11:16Z
2016-12-22T11:11:16Z
2009
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/92088
 
Format application/pdf
 
Publisher DIVISION OF FRUITS AND HORTICULTURAL TECHNOLOGY