Genetically Modified Organisms: Innovation and Concern

Genetically modified organisms (GMOs) represent a unique category of living beings that differ from their natural counterparts through deliberate human alteration of their genetic makeup. Since the fundamental distinction among species lies in their DNA, any organism whose genome has been artificially modified could be considered “exotic” compared to its original population.

According to the European Economic Community, a GMO is “an organism in which the genetic material has been altered in a way that does not occur naturally by mating and/or natural recombination.” The term “organism” refers broadly to any biological entity capable of reproduction or of transferring genetic material. This definition encompasses not only plants and animals but also microorganisms such as bacteria, viruses, and parasites. However, non-viable products derived from GMOs that cannot replicate or transfer genes are not themselves considered GMOs.

Public discussion of GMOs intensified in the 1990s, particularly with their proposed use in agriculture to boost food production. Genetic modification (GM), also known as biotechnology, involves transferring DNA between species using laboratory methods. In agriculture, GM has primarily been used to create crops with enhanced resistance to pests, diseases, and environmental stresses. Advocates argue that GMOs can improve yields, reduce reliance on chemical fertilizers and pesticides, and enable farming on marginal lands with poor soil fertility or high salinity. Such innovations, they claim, could play a vital role in combating poverty and food insecurity in developing nations like India and China.

Nevertheless, GMOs remain controversial. Critics, including environmental scientists and activists, warn of unintended ecological and social consequences. One major concern is “gene flow,” the spread of modified genes into wild or native plant populations through pollen dispersal, potentially threatening biodiversity. There is also the risk that GM crops with herbicide or pest resistance could become invasive weeds if their seeds spread beyond cultivated fields. Additionally, the ecological effects of toxins produced by some GM plants raise concerns for non-target species and ecosystem health.

Thus, while GMOs hold great promise for addressing global agricultural challenges, their use demands careful regulation, transparent research, and ongoing ethical and environmental consideration.
Genetically Modified Organisms: Innovation and Concern

Genetic Resource of Rice

Genetic Resource of Rice
Cultivated rices fall into two groups similar in appearance but distinguish by their different areas of origin and by the sterility of hybrids between them, indicating significant genetic separation. They are Oryza sativa, Asian rice, and Oryza glaberrima, African rice. Both are presumed to have descended from a common ancestor, perhaps O. perennis, a wild perennial species widely distributed throughout the tropics. The evolution of the two groups proceeded independently with the similar steps in each case; first, the evolution from the presumptive common ancestor, of two wild perennial, one Asian the other Africa. Each in turn gave rise to a wild annual species from which the cultivated annuals arose. Chromosome studies show that the species in the two pathways share the same genome AA, which appears to have undergone some modifications in the O. glaberrima pathway. These differences are associated with, though not necessarily responsible for, the genetic isolation between the two groups. Uncertainties exist about the precise identity of ancestral species, partly because of the absence of major genomic differentiation, which provided strong evidence of origin in other species groups such as wheat and cotton. All cultivated rices are diploids.

O. glaberrima occurs in sub-Saharan Africa, in flood plain habitats where it is sown before the floods arrive and harvested after they have receded. Upland or ‘dryland’ varieties are also grown. Although it is hardier than O. sativa, it nevertheless has been replaced by O. sativa whenever condition permit the latter’s cultivation. The greatest diversity of O. glaberrima is in West Africa.

The starting point for the differentiation of the Asian rices is perennial wild grass O. rufipogon, widely distributed in south and south-east Asia, south China, and South America, from which the annual wild species O. nivara arose. O. nivara has a wide distribution range in India, south-east Asia and Oceania. Domestication of nivara involved selection for non-brittle ears, larger plants and grain, and shorter dormancy and it probably occurred, perhaps in several independent cases, within the large area north east India, northern Bangladesh, Burma, Thailand, Laos, Vietnam and south east China. From this diffuse area origin, cultivate rice was rapidly and widely dispersed into new regions and habitats by farmers who doubtless could see the immense benefits to be gained from the addition of a cereal crop to a farming culture which up to that time had lacked one.
Genetic Resource of Rice