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African Crop Science Journal
African Crop Science Society
ISSN: 1021-9730 EISSN: 2072-6589
Vol. 3, Num. 2, 1995, pp. 131-133
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African Crop Science Journal, Vol. 3. No.2. pp. 131-133,
1995
The importance of biosafety in the deployment of private
transgenic sorghums in the environment
S. SHANTHARAM
Microorganisms Branch Biotechnology, Biologics, and
Environment Protection USDA/APHIS/BBEP, 4700 River Rd, Unit
147. Riverdale, MD 20737, USA
Code Number: CS95018
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ABSTRACT
This pa per provides a n overview of the concerns towards
commercialization and deployment of transgenic sorghums. It
also highlights the key role USDA/APHIS has played in the
international harmonization of biotechnology regulatory
policies.
Key Words: Commercialization, transgenic sorghums,
regulatory policies
RESUME
Ce papier donne un apercu sur les problemes lies a la
commercialisation et la diffusion des sorgho transgeniques. I1
met aussi en evidence le role cle de I'USDA/APHIS dans
l'harmonisation des politiques reglementant la
biotechnologie.
Mots Cles: Commercialisation, sorgho transgeniques,
politiques regulatoires
Biosafety and environmental impacts of introducing genetically
engineered organisms into different agricultural environments
present new challenges for the commercialization of
biotechnology products. For an environmentally sound and
sustainable mode of agricultural development, it is essential
that biosafety issues be examined in detail to allay fears of
significant impacts to non-target organisms, and also any
other potential changes in the agriculture of crop plants, and
related health and social structure effects. Biosafety has
become a critical issue for technology transfer of safe
products of biotechnology.
The USDA/Animal and Plant Health Inspection Service
(APHIS) has been at the forefront of international
harmonization of biotechnology regulatory policies, and has
actively promoted the development of protocols to safely
deploy genetically engineered plants in different agroclimatic
conditions. To that end, APHIS/ Biotechnology, Biologies, and
Environmental Protection (BBEP) has sponsored half a dozen
biosafety workshops on maize, wheat, tomato, potato, canola,
and rice. These workshops have been of immense value, and
serve as useful guides to most countries worldwide.
Current sorghum (Sorghum bicolor (L.) Moench)
breeding efforts are directed at several agronomic traits,
most important of which is the resistance to the parasitic
weed Striga. Several biotechnological efforts are
underway to engineer weed controlling traits into sorghum.
Recently, a group of researchers at Purdue University,
West Lafayette, Indiana, USA, through funding from Pioneer
Hi-Bred International, reported the first successful
transformation of sorghum with a bar gene from
Streptomyces hygroscopicus. that confers tolerance to
the herbicide bialaphos (Casas et al., 1993). The
bar gene codes for phosphinothricin acetyl transferase.
the enzyme that detoxifies glufosinate. the ammonium salt of
phosphinothricin. This is a significant development in the
area of agricultural biotechnology, sorghum being an important
grain and forage crop that is uniquely adapted to semi-arid
environments dominant in most of the tropical countries of the
world.
Sorghum is a coarse grain, which is a staple food for more
than 400 million people in the semi-arid tropics and has been
grown in Africa for more than 6000 years (Doggert, 1988). The
crop ranks second to rice as the most important staple food of
the people of the tropics. Sorghum occupies fifth place in the
world production of crops (59 million metric tonnes from 45
million hectares of land). In the western hemisphere, sorghum
is primarily grown as a livestock feed. Presently, sorghum is
the third largest cereal grown in the United States, and is a
preferred crop in areas of low water availability. It is grown
for feed, forage, broomcorn, and a sweet syrup.
Current cultivars and landraces of sorghum are derived
from several wild species. Crosses between those landraces.
and wild species and cultivated sorghums still occur. In the
USA. johnsongrass (S. halepense (L.) Pers.), is a
troublesome weed with which cultivated sorghums
cross-pollinate (Doggett, 1988).
Some of the major concerns that have been addressed while
discussing the biosafety and environmental impacts of
genetically engineered crops in general, are potential for
gene escape, environmental consequences of gene escape, and
safeguards to prevent or minimize gene escape. Some of the
biosafety questions that can be specifically asked of sorghum
are: (1) will genetically engineered sorghum reduce the number
of landraces of sorghum. or otherwise alter the available gene
pool of sorghum? This is aquestion related to effects of
biotechnology on biodiversity and germplasm; (2) will
genetically engineered sorghum alter or otherwise harm wild or
weedy species of the genus Sorghum?; (3) will
genetically engineered sorghum alter pest resistance to such
pests as Striga?; (4) what kind of genes introduced
into sorghums lead to weediness or weed problems'?; (5) will
genetically engineered sorghum result in a reduction in
diversity of cultivated sorghums which will put them at a
higher risk for uniform crop failure under seasonal variations
in pest and other growing conditions?; and (6) will
genetically engineered sorghum result in altered agronomic
practices such as purchased seed versus saved seed, shifts
toward monoculture, dependence on outside inputs, etc., which
will have long term effects on land or agriculture
sustainability?
The deliberation on the biosafety of genetically
engineered sorghums is extremely important as it serves as a
platform for discussions on the assessment of biotechnology
applied to sorghums, including its cost-benefits, and is very
crucial for technology transfer, trade and agricultural
production in the developing countries. The recommendations
from this workshop will pave way for the international
harmonization of biotechnology regulatory policies.
The presentations that will follow in this special issue
will no doubt highlight the biology and cultivation practices
of sorghums in different parts of the world. and set a stage
for lively discussions on the above listed questions. Most
importantly, the discussions will also throw light on the
future direction of the applications of plant molecular
biology and genetic engineering to the improvement of
sorghum.
In 1988/89, USDA/APHIS initiated an active series of
scientific, technical, and policy discussions involving
scientific, industrial, and professionally active groups and
individuals to address critical needs and questions related to
the increasing challenges of the rapidly advancing field of
agricultural biotechnology. These series of national and
international level discussions came to be known as
Biotechnology Regulatory Support Activities. So far,
USDA/APHIS have sponsored several of such international level
workshops and discussions that have positively influenced the
development of biotechnology regulatory policies throughout
the world. Considering the economic importance of sorghum in
the world, APHIS/BBEP strongly believed that an international
consultation on various biosafety aspects should be organized
to recommend certain good developmental and cultural practices
while growing genetically engineered sorghums on a large
scale.
REFERENCES
Casas, A.M., Kononowicz, A.K., Zehr, U.B.Tomes, D.T.,
Axtell, J.D., Butler,L.G., Bressan, R.A. and Hasegawa, P.N.
1993. Transgenic sorghum plants via microprojectile
bombardment. Proceedings of the National Academy of
Sciences USA. 90:11212-11216.
Doggert. H. 1988. Sorghum. Second Edition. Longman
Scientific & Technical, New York, NY, USA. 512pp.
Copyright 1995 African Crop Science Society
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