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Studies on growth and physiochemical changes in citrus rootstocks under NaCl stress

KrishiKosh

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Title Studies on growth and physiochemical changes in citrus rootstocks under NaCl stress
M Sc
 
Creator SACHIN KUMAR PATEL
 
Contributor A. K. Dubey
 
Subject fruits, rootstocks, vegetative propagation, irrigation, planting, concentrates, chlorophylls, food preservation, enzymes, sampling
 
Description T-8335
Citrus is regarded as a salt-sensitive crop, but its growth and yield response
to salinity is affected by variety, rootstock, and duration of salt exposure, irrigation
management, soil type, and climate. This study quantified the effect of graded level
of NaCl on growth and dry mass production of different rootstocks. The pot
experiment was conducted with four levels of NaCl i.e 0.0 mM NaCl, 50 mM NaCl,
100 mM NaCl and 200 mM NaCl on five different citrus rootstocks viz., rough
lemon Attani-2 Troyer citrange, sour orange and billikhichlli during 2008-2010.
Results revealed that irrigation of seedlings of all rootstocks with higher
concentration of NaCl (200 mM) had exerted the maximum detrimental effect on
plant height, stem diameter, number of leaves and dry mass production in all
rootstocks. The minimum increase in stem diameter and the maximum defoliation
was recorded in Troyer. The maximum reduction in fresh weight of shoot and in
root was recorded in Attani-2 with application of 200 mM NaCl. In Attani-2, root to
shoot ratio shows decreasing trend after 50 mM NaCl. However, in sour orange,
rough lemon, billikhichlli and Troyer it increases upto higher NaCl concentrations.
Salinisation enhanced MII and reduced RWC and chlorophyll fractions in all citrus
rootstocks. At higher salinity level, the maximum improvement in SOD and POD
activities was found in Troyer. Sour orange had minimum improvement in SOD
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activity. The maximum enhancement in leaf proline content was recorded in Attani-
2. Sodium and Chloride accumulation in leaf tissues increased with increasing level
of NaCl in all genotypes. However, Attani-2 increased more Na+ in leaf tissue. The
maximum increase Cl- was noticed in Troyer and the minimum in rough lemon at
200 mm NaCl. Chloride accumulation in root tissues increased minimum in sour
orange and Attani-2. Furthermore, the maximum improvement in K was found in
rough lemon.
 
Date 2016-10-22T12:05:19Z
2016-10-22T12:05:19Z
2010
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/81390
 
Format application/pdf
 
Publisher IARI, DIVISION OF FRUITS AND HORTICULTURAL TECHNOLOGY