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Growth and physiological response of salt-sensitive and salt-tolerant rootstocks of citrus to paclobutrazol under salt stress

Indian Agricultural Research Journals

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Title Growth and physiological response of salt-sensitive and salt-tolerant rootstocks of citrus to paclobutrazol under salt stress
 
Creator DUBEY, A K
SRIVASTAV, MANISH
SINGH, A K
PANDEY, R N
 
Subject Citrus rootstock; Chlorophyll; Membrane injury index; Paclobutrazol; Root to shoot ratio; RWC; Salinity
 
Description The response of paclobutrazol was studied during 2006-07 on salt-sensitive ‘Soh Sarkar’ (Citrus karna Raf.) and salt-tolerant ‘Rangpur lime’ (Citrus limonia Osbeck) under salt stress. One-year-old seedlings of both rootstocks were grown in earthen pots of 10 inches size containing 5 kg soil. Paclobutrazol (0, 125 and 250 ppm) was applied 7 days prior to salinization is a 1 ½ litre solution/pot. Computed amount of NaCl (1 000 mg/kg soil) was added in solution form to get soil salinity level of 2 dS/m. Paclobutrazol mitigated the salinity stress effects in both the rootstocks. Application of 250 ppm paclobutrazol increased plant height (34.70%), leaves/plant (170.61%), root length (51.83%), shoot fresh weight (51.89%) and dry weight (44.88%), root fresh weight (14.42%) and dry weight (58.06%) under salt stress than salinized control without paclobutrazol application in salt-susceptible ‘Soh Sarkar’. While in ‘Rangpur lime’, application of 125 ppm paclobutrazol increased maximum plant height (10.33%), root length (68.84%), shoot fresh weight (31.38%) and dry weight (41.25%), root fresh weight (95.40%) and dry weight (76.34%) under salt stress as compared to salinized seelings without paclobutrazol. Root to shoot ratio increased maximum in ‘Soh Sarkar’ (35.30%) and in ‘Rangpur lime’ (24.32%) with application of 125 ppm paclobutrazol under salt stress. Paclobutrazol-treated plants of the both rootstocks had less defoliation and toxicity symptoms appeared on fewer leaves. Relative water content, chlorophyll a and b, total chlorophyll and chlorophyll a to b ratio in both rootstocks increased by application of paclobutrazol. Membrane injury index reduced by 20.18% in Soh Sarkar and 51.83% in ‘Rangpur lime’ with application of 250 ppm paclobutrazol under salt stress than salinized seedlings without paclobutrazol treatment. The findings suggested that paclobutrazol promoted salt stress avoidance in both salt-sensitive and salt-tolerant rootstocks of citrus.
 
Publisher The Indian Journal of Agricultural Sciences
 
Contributor —
 
Date 2011-01-04
 
Type info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Peer-reviewed Article
 
Format application/pdf
 
Identifier http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/2457
 
Source The Indian Journal of Agricultural Sciences; Vol 79, No 8 (2009)
0019-5022
 
Language eng
 
Relation http://epubs.icar.org.in/ejournal/index.php/IJAgS/article/view/2457/593
 
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