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EFFECT OF Bt-TRANSGENIC COTTON ON SOIL BIOLOGICAL HEALTH

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Title EFFECT OF Bt-TRANSGENIC COTTON ON SOIL BIOLOGICAL HEALTH
Not Available
 
Creator Jagadish C. Tarafdar
Indira Rathore
Vandana Shiva
 
Subject Bt toxin
enzyme activities
microbial biomass
soil health
transgenic Bt-cotton
tropical sub-humid climate
 
Description Not Available
Bt cotton are plants that have been genetically modified to express the
insecticidal proteins Cry 1 Ac from subspecies of the bacterium, Bacillus
thuringiensis israelensis (Bt), to control bollworm pest that feed on cotton.
There is a persistent environmental concern that transgenic Bt-crops
carry genes that have indirect undesirable effect to natural and agro–
ecosystem function. We investigated the effect of Bt-cotton (with Cry 1 Ac
gene) on several microbial and biochemical indicators in fields under subhumid tropical condition. Twenty five fields were selected in the
Vidarbha region, India, where Bt-cotton has been growing at least three
consecutive years and side by side field of non-transgenic cotton is
growing under clay to clay loam soil. Soil from a control (no-crop)
treatment was also included from each area to compare the extent of
adverse effect of Bt, if any. Samples were analyzed for actinobacteria,
fungi and nitrifiers population, biomass carbon (MBC), biomass nitrogen
(MBN), biomass phosphorus (MBP) and soil enzyme activities. The result
revealed a significant decline in actinobacteria (17%), bacterial (14%)
count as well as acid phosphatases (27%), phytase (18%), nitrogenase
(23%) and dehydrogenase (12%) activities in Bt cotton compared with
non-Bt cotton fields. Fungal and nitrifiers counts and esterase and
alkaline phosphatase activities were not affected by the introduction of
Bt-cotton in fields. However, significant decline between 8 and 9% in
MBC and MBN was also noticed.
Not Available
 
Date 2020-08-10T11:12:12Z
2020-08-10T11:12:12Z
2012-01-01
 
Type Research Paper
 
Identifier Not Available
Not Available
http://krishi.icar.gov.in/jspui/handle/123456789/39243
 
Language English
 
Relation Not Available;
 
Publisher Not Available