Recently, Union Science Minister said in the Rajya Sabha that Field trials of the transgenic mustard variety, Dhara Mustard Hybrid-11 (DMH-11), revealed them to be higher yielding and they did not deter the pollination habits of honeybees,
GS II: Environment and Ecology
Dimensions of the Article:
- What exactly is hybrid mustard?
- What are GM Crops?
- Regulating Bodies concerned with GM Crops
What exactly is hybrid mustard?
- 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.
Genetic modification (GM) of 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).
What are GM Crops?
- Genetically modified crops (GM crops) are plants used in agriculture, the DNA of which has been modified using genetic engineering techniques. More than 10% of the world’s crop lands are planted with GM crops.
- In most cases, the aim is to introduce a new trait to the plant which does not occur naturally in the species like resistance to certain pests, diseases, environmental conditions, herbicides etc.
- Genetic Modification is also done to increase nutritional value, bioremediation and for other purposes like production of pharmaceutical agents, biofuels etc.
Regulating Bodies concerned with GM Crops
- The top biotech regulator in India is Genetic Engineering Appraisal Committee (GEAC).
- The committee functions as a statutory body under the Environment Protection Act 1986 of the Ministry of Environment & Forests (MoEF).
- GEAC is responsible for granting permits to conduct experimental and large-scale open field trials and also grant approval for commercial release of biotech crops.
- The Rules of 1989 also define five competent authorities for handling of various aspects of the rules:
- The Institutional Biosafety Committees (IBSC),
- Review Committee of Genetic Manipulation (RCGM),
- Genetic Engineering Approval Committee (GEAC),
- State Biotechnology Coordination Committee (SBCC) and
- District Level Committee (DLC)
- The Cartagena Protocol on Biosafety to the Convention on Biological Diversity is an international agreement on biosafety as a supplement to the Convention on Biological Diversity effective since 2003.
- The Biosafety Protocol seeks to protect biological diversity from the potential risks posed by genetically modified organisms resulting from modern biotechnology.
-Source: The Hindu