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Mahesh

14/01/24 06:38 AM IST

GM mustard approval

In News
  • The Supreme Court  questioned the Centre on why reports of the court-appointed Technical Experts Committee (TEC) on the biosafety of genetically modified (GM) crops were not looked into by the Genetic Engineering Appraisal Committee (GEAC).
Mustard Hybrid DMH-11
  • The transgenic mustard hybrid DMH-11 has been developed by the Centre for Genetic Manipulation of Crop Plants (CGMCP) at Delhi University.
  • Hybridisation involves crossing two genetically dissimilar plant varieties that can even be from the same species.
  • The first-generation (F1) offspring from such crosses tend to have higher yields than what either parent can individually give.
  • Such hybridisation isn’t easy in mustard, as its flowers have both female (pistil) and male (stamen) reproductive organs, making the plants largely self-pollinating.
  • Since the eggs of one plant cannot be fertilised by the pollen grains from another, it limits the scope for developing hybrids — unlike in cotton, maize or tomato, where this can be done through simple emasculation or physical removal of anthers.
Hybridisation in Mustard
  • Scientists at Delhi University’s Centre for Genetic Manipulation of Crop Plants (CGMCP) have developed the hybrid mustard DMH-11 containing two alien genes isolated from a soil bacterium called Bacillus amyloliquefaciens.
  • The first gene (‘barnase’) codes for a protein that impairs pollen production and renders the plant into which it is incorporated male-sterile.
  • This plant is then crossed with a fertile parental line containing, in turn, the second ‘barstar’ gene that blocks the action of the barnase gene.
  • The resultant F1 progeny is both high-yielding and also capable of producing seed/ grain, thanks to the barstar gene in the second fertile line.
  • The CGMCP scientists have deployed the barnase-barstar GM technology to create what they say is a robust and viable hybridisation system in mustard.
  • This system was used to develop DMH-11 by crossing a popular Indian mustard variety ‘Varuna’ (the barnase line) with an East European ‘Early Heera-2’ mutant (barstar).
  • DMH-11 is claimed to have shown an average 28% yield increase over Varuna in contained field trials carried out by the Indian Council of Agricultural Research (ICAR).
GEAC recommendation
  • It recommended the environmental release of DMH-11 “for its seed production and testing…prior to commercial release.
  • GEAC has also recommended the environmental release of DMH-11’s parental lines (carrying the barnase and barstar genes) for them to be used to develop new hybrids. Such hybrids could give even higher yields than DHM-11.
  • Mustard varieties in India have a narrow genetic base. The barnase-barstar system enables breeding of hybrids from a wider range of mustards, including those of East European origin such as ‘Heera’ and ‘Donskaja’.
Challenges
  • In GM mustard, there have been two specific concerns voiced as well.
  • The first is the presence of a third ‘bar’ gene, which makes GM mustard plants tolerant to the spraying of glufosinate ammonium, a chemical used for killing weeds.
  • This, the opponents allege, will cause displacement of manual labour engaged in weeding by promoting the use of chemical herbicides.
  • The GEAC has recommended the “usage of any formulation of herbicide…exclusively for hybrid seed production”, while not permitting the same “for cultivation in the farmer’s field under any situation”.
  • The second concern is over GM mustard threatening or undermining the population of honey bees. Mustard flowers are a source of nectar for honey bees and many other pollinator insects.
Source- Indian Express

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