Review of Extension and Analysis on Current Status of Hybrid Rice in China

Abstract

In the 40 thanniversary of hybrid rice extension( from 1976 to 2015) in China,the extension process and current status of hybrid rice,including two-line hybrid rice and japonica hybrid rice,was reviewed and analyzed.The cumulated extension area of hybrid rice was 531. 62 million hm2 from 1976 to 2013,and the annual planting area reached the peak in 1995 at 20. 897 8 million hm2,accounting for 67. 97% of total rice area. However,both of the area of hybrid rice and its percentage to total rice area showed a slightly downward tendency after 1999,and in 2013 the planting area was 16. 178 7 million hm2,accounting for 53. 37% of total rice area. The number of major hybrid rice varieties with annual planting area over 6 700 hm2 was increased from 133 in 1996 to 532 in 2013 while the averaged planting area per variety was decreased from 0. 110 1 million hm2 in 1996 to 0. 023 6 million hm2 in 2013,indicating a fierce competition among varieties and deficiency of dominant varieties in recent years.From 1996 to 2013,the percentage of two-line hybrid rice to hybrid rice in planting area was increased from0. 92%( 0. 180 5 million hm2) to 33. 59%( 5. 440 4 million hm2),indicating that two-line hybrid rice had become an important part of hybrid rice. Currently,the annual planting area of japonica hybrid rice was 0. 20 ~ 0. 26 million hm2or only 1. 1% ~ 1. 5% of total hybrid rice area,indicating the very weak position of japonica hybrid rice in hybrid rice.