Breeding of waxy corn lnbred line "shen-w22" with good quality,early ripening and high combining ability by different-ecotype genes of good characters

The waxy corn inbred lineShen - W22 , showing good quality, early ripening and high combining a-bility, was successfully developed through 18 - year breeding by gathering different - ecotype genes of good char-acters. It accords with the national standard in the variety's distinctness, uniformity, and stability through DUS testing by New Plant Variety Test Center, Ministry of Agriculture of P. R. China, this inbred line has gained a new plant variety right,It has three outstanding characteristics:① Its amylopectin content is 98. 88% , showing good glutinous quality.② Its earliness passes down steadily the growth period of the hybrids bred by using this line as a parent is between those of the parent lines and shorter than the average of those of two parent lines or approaching that of Shen W22 with earliness.③ It has a high combining ability. The hybrids Huyunuo No. 1 , Huyunuo No. 2 and Huyunuo No. 3 bred by using the line as a parent have a high yield, increasing by 5%-22.9% fiver Suyunuo No. 1.