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Chilean Journal of Agricultural Research
Instituto de Investigaciones Agropecuarias, INIA
ISSN: 0718-5820 EISSN: 0718-5820
Vol. 76, No. 2, 2016, pp. 243-252
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Bioline Code: cj16033
Full paper language: English
Document type: Review Article
Document available free of charge
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Chilean Journal of Agricultural Research, Vol. 76, No. 2, 2016, pp. 243-252
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Competitive ability of cultivated rice against weedy rice biotypes – A review
Olajumoke, Bashira; Juraimi, Abdul Shukor; Uddin, Md. Kamal; Husni, Mohd H.A. & Alam, Md. Amirul
Abstract
Weedy rice has been identified as a threat to rice production
worldwide. Its phenotypic and genotypic diversity and its
potential to compete against rice in all development stages
from germination to maturity have resulted in a loss of rice
yield and grain quality, which is remarkably high in directseeded
rice cultivation. Weedy rice dormancy varies, it has
a higher germination rate, and tolerates deeper germination
depth compared to rice cultivars. Interactions of weedy
rice with cultivars often reflect early vigor, more tillering,
nutrient utilization ability for shoot development with
respect to rice cultivars even though the latter also show
an improvement in shoot development under competition.
An exponential relationship has been reported between
cultivated rice loss and weedy rice density: this is true
for all rice cultivars. The degree of loss is dependent on
the competitive ability of the rice cultivar being studied,
and each weedy rice biotype also interacts differently.
Hence, the need for a comprehensive study of the biology
of various weedy rice variants. Difficulties arise in the
management of weedy rice due to its physiological,
anatomical, and morphological similarities to cultivated
rice. The manipulation of the environment to improve
cultivated rice production and suppress the emergence
of weedy rice variants is important in the management
of weedy rice, as well as other cultural practices and use
of pesticides. The development of herbicide-resistant
rice cultivars is necessary to totally eliminate the weedy
rice variants. This review provides information on the
competitive ability of weedy rice against rice cultivars; this
information is essential to create management options to
control weedy rice.
Keywords
Competitive ability; Oryza, rice; weedy rice
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