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Physiological and biochemical responses of citrus rootstocks under salinity stress

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Title Physiological and biochemical responses of citrus rootstocks under salinity stress
 
Creator Anshuman Singh, Jai Prakash, Manish Srivastav, S. K. Singh, O. P. Awasthi, A. K. Singh, S. K. Chaudhari and D. K. Sharma
 
Subject Antioxidant enzymes, chlorophyll, citrus, proline, rootstocks, salinity.
 
Description Physio-biochemical response of indigenous citrus rootstocks namely Attanni-1 (Citrus rugulosa), Attanni-2
(C. rugulosa) and Jatti khatti (C. jambhiri) under NaCl stress was studied. The experiment was performed on
1-year-old potted plants which were irrigated with non-saline and saline (25 and 50 mM NaCl) water. Results
indicated that salt stress had a pronounced effect on different physiological and biochemical parameters of
these rootstocks. The highest MII (0.159) was recorded in Jatti khatti under 50 mM salinity followed by Attani-2
and Attani-1. There was almost two-fold reduction in RWC in the Jatti khatti rootstock under 50 mM salinity as
compared to Attani-1 and Attani-2 rootstocks. The maximum (2.22 mg g-1 FW) total chlorophyll was recorded in
Jatti khatti (control) followed by non-salinised Attani-1 and Attani-2. Salt stress induced a sharp reduction in
total chlorophyll content in Jatti khatti as compared to other two rootstocks. The highest SOD (45.67 units mg-1
protein min-1) and CAT (5.34 ยต moles H2
O2
hydrolized mg-1 protein min-1) activities were recorded in the Jatti khatti
under 50 mM NaCl salinity followed by Attani-2 and Attani-1. CAT activity declined in different rootstocks at 50
mM salinity. There was a sharp increase in salt induced POD levels in different rootstcoks upto 25 mM salinity
with the highest activity (0.75 Absorbance units g-1 FW) in Jatti khatti followed by Attani-2 rootstocks. Based
on observations on membrane stability, relative water content, photosynthetic pigments, proline content and
activity of antioxidant enzymes, the relative salt tolerance of citrus rootstocks was adjudged to decrease in the following order: Attanni-1>Attanni-2> Jatti khatti.
Indian Council of Agricultural Research
 
Date 2017-06-21T11:28:45Z
2017-06-21T11:28:45Z
2014-06
 
Type Research Paper
 
Identifier Singh, A., Prakash, J., Srivastav, M., Singh, S. K., Awasthi, O. P., Singh, A. K., Chaudhari, S. K. & Sharma, D. K. (2014). Physiological and biochemical responses of citrus rootstocks under salinity stress. Indian Journal of Horticulture, 71(2): 162-167.
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http://krishi.icar.gov.in/jspui/handle/123456789/4377
 
Language English
 
Publisher The Horticultural Society of India