Molecular Assisted Breeding and Adaptability Analysis of Zhongyouza 11 with Super High Oil Content

Using a three-line system of Shaan 2A cytoplasmic male sterility,a hybrid variety rapeseed,Zhongyouza 11,was developed by the combination of traditional methods and a molecular marker-assisted breeding technique. This hybrid variety had high grain yield,high oil content,wide adaptability,and good quality. The oil content of Zhongyouza 11 is steadily above 43% in the three ecological regions along the Yangtze River valley,which is the largest winter oilseed production area in China. The highest oil content of Zhongyouza 11 reached 46.68% in the upper reaches of the Yangtze River valley in 2003-2004,which was the highest among all lines involved in the national regional rapeseed variety trials. In the regional yield trials in Hubei Province,the average yield of Zhongyouza 11 reached 2 853 kg ha-1 (2002-2004),yielding more than the control variety Zhongshuang 6 by 11.34%. In the national trials,the yield of Zhongyouza 11 reached 2 405.7,2 697.3,and 2 770.2 kg ha-1 in the upper,middle,and lower reaches of the Yangtze River valley,yielding more than the control varieties by 11.52,12.9,and 14.92%,respectively,in 2003-2005. Both the high oil content and high grain yield contributed to the high oil yield of Zhongyouza 11. The oil yield of Zhongyouza 11 in the national trials reached 1 083.3,1 210.2,and 1 224.8 kg ha-1,yielding more than the controls by 29.42,27.65,and 20.98%,respectively,in the upper,middle,and lower reaches of the Yangtze River valley. The highest oil yield reached 1 369.65 kg ha-1 in the middle reach of the Yangtze River valley (2003-2004),with an increase of 46.21% compared to the control. The experimental sites distributed widely along the Yangtze River valley,cover most of the Chinese winter rapeseed production areas. Among the 89 experimental location/years,the yield of Zhongyouza 11 surpassed the controls at 77 location/years in the trials,indicating its wide adaptability. Zhongyouza 11 was the only one that passed the national regional trials in all