Origin, cultivation and improvement of Rice
Origin, cultivation and improvement of Rice Botanical Name:- Oryza sativa Family:- Poaceae or Gramineae Chromosome Numbers:- 2n = 2x = 24 2. Species:- Genus Oryza has total 24 species. 22 species are wild and 2 species are cultivated. Cultivated species are:- a. Oryza sativa:- This is main cultivated species. It is cultivated all over the world. It has 3 main sub - species:- i. indica:- In warm areas ii. japonica:- In cold areas iii. javanica:- In intermediate areas (In Indonesia) Above mentioned sub - species have morphological, physiological and genetic variations. b. Oryza glaberrima:- · It occurs in warm areas. · It is cultivated in West Africa. · Gradually, it is being replaced by the Oryza sativa species. 3. Center of Origin :- · Oryza sativa is also called as "Asian Rice" because it originated in south Asia and South East Asia. It is originated from a perennial wild species ' Oryza rufipogon '...