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Impact of transgenic cotton varieties on activity of enzymes in their rhizosphere

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Title Impact of transgenic cotton varieties on activity of enzymes in their rhizosphere
 
Creator Mina, Usha
Anita Chaudhary, Anita
 
Subject Bt-Cotton
Dehydrogenase
Urease
Phosphatase
Soil enzymes
Growth stage
 
Description 195-201
The impact of five Bacillus thuringiensis
(Bt) cotton varieties and their respective isogenic non-Bt(NBt) isolines (ANKUR-2534, MECH-6304, RCH-317, ANKUR-651 and MECH-6301) was assessed on the
key soil enzymes i.e., dehydrogenase, alkaline phosphatase and urease in their rhizosphere at four growth
stages of the crop, namely vegetative, flowering, bolling and harvesting. These varieties were grown on farmer’s
field in villages 22 miles and 24 miles of Ganganagar District of Rajasthan
State in India.
Results showed that dehydrogenase, alkaline phosphatase and urease activities
were higher in rhizosphere of Bt isolines as compared to NBt isolines of
all the varieties. Except phosphatase,
differences in dehydrogenase and urease activities in rhizosphere of Bt
and NBt isolines of all five varieties were significant (P<0.05). Maximum enhancement in the three enzymes activities
was observed in MECH-6304 Bt
isoline rhizosphere. Maximum and minimum activities of dehydrogenase and urease
were observed in MECH-6304 and RCH-317 Bt isolines,
respectively, whereas phosphatase activity was maximum and minimum in MECH-6304 and ANKUR-651 Bt isolines, respectively. Maximum dehydrogenase
and urease activities were observed at boll formation and minimum at flowering
and harvesting stage, respectively, while maximum phosphatase activity was
observed at vegetative stage and minimum
at harvesting stage. In conclusion, all the studied Bt isolines of
cotton varieties showed no adverse effect on dehydrogenase, alkaline phosphatase
and urease activities in the rhizosphere.
 
Date 2012-06-18T11:33:56Z
2012-06-18T11:33:56Z
2012-06
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://hdl.handle.net/123456789/14280
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJBB Vol.49(3) [June 2012]