Rice (Oryzae sativa L.), a member of family Poaceae is widely grown in tropical and
subtropical regions of the world (Ezuka & Kaku, 2000). Rice is one of the major food
crops of the world especially of the most Asian countries like Pakistan, Bangladesh,
China, Vietnam and Korea. Rice is placed on second position in cereal cultivation around
the globe and occupies an important position in the economy of Pakistan as an export
item as well as staple food (Zahid et al., 2005). Approximately 90% of the world's rice is
grown in Asia continent and constitutes a staple food for 2.7 billion people worldwide
(Salim et al., 2003). Rice as the third largest crop of Pakistan covers about 10%
cultivated area and contributes about 17% towards total cereal grains production of the
country (Ahmad et al., 2005).
Rice (Oryzae sativa L.), a member of family Poaceae is widely grown in tropical andsubtropical regions of the world (Ezuka & Kaku, 2000). Rice is one of the major foodcrops of the world especially of the most Asian countries like Pakistan, Bangladesh,China, Vietnam and Korea. Rice is placed on second position in cereal cultivation aroundthe globe and occupies an important position in the economy of Pakistan as an exportitem as well as staple food (Zahid et al., 2005). Approximately 90% of the world's rice isgrown in Asia continent and constitutes a staple food for 2.7 billion people worldwide(Salim et al., 2003). Rice as the third largest crop of Pakistan covers about 10%cultivated area and contributes about 17% towards total cereal grains production of thecountry (Ahmad et al., 2005).
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