Abstract: Twelve combinations were used for analyzing superstandard heterosis of plant kernel number,plant kernel weight, plant spike number, spiklet number of main spike, 1000 kernel weight, spike length in the spring hybrid wheat with T type. The results indicated that the plant kernel weight, plant spike number, 1000 kernel weight, spike length of all combinations have positive superstandard, heterosis,the superstandard heterosis of plant kernel number and spiklet number of main spike showed positive or negative heterosis with a big change range, namely,-19.2% to 56.5%,-2.1% to 5.3%. The same parents regression analysis of GCA was adapted, SCA of kehan 9A and Kehan Ke 82R27 were highest, the second was Ke Feng 2A×Ke 82R27, the third was Ke Feng 3A×Ke 82R27. The two spring hybrid wheat with T type and the two CHA hybrid wheat were used. The 3 parents(two of them were check varieties),total varieties were seven.The effects of population density on the main characters and their heterosis in spring hybrid wheat was studied,the aptimum range of population density in spring hybrid wheat was definited, good cultivating measures must be used for appropriate usage of heterosis effects in hybrid wheat.

Key words: Spring wheat, Heterosis, Population density, Heterosis effects

CLC Number: 

• S512.101