Investigation on the Plant Height Constitution and Breeding Potential of a Dwarfing Somatic Variation Line AS34 in Wheat

It is very important to create,characterize,and use wheat dwarfing resources for wheat breeding. Even though many dwarfing materials have been excavated in Triticum genera so far,most of them are less valuable in wheat variety improvement. In this study,a dwarfing somatic variation line AS34 developed recently and its F 1 and F 2 generation plants with Chinese Spring( C. S) were investigated for plant height constitution and several main agronomic traits related to yield potential. Results revealed that the stem of AS34 was consisted of four internodes,which was one less than its wild type of Yumai66. The length of each internode in AS34 was shortening by a similar ration with the plant height to Yumai66,and the first internode was less than the second internode in length of this dwarfing line. The plant height and internode length of the F 1 plants were almost the average values of their two parents, containing the same internodes as AS34. Especially,the F 1 plants appeared superiority over their two parents in spike length,spikelets per spike and grains per spike. In the F 2 generation plants,plant height,spike length,grains per spike,and spikelets per spike varied broadly,and about 70% of the F 2 plants had 60-89 cm in plant height, 6. 0-9. 9 cm in spike length,50-79 grains per spike,and 20-24 spikelets per spike. Results suggested that the dwarfing trait of AS34 was controlled by multiple genes,and appeared positive genetic effects on the above main agronomic characteristics in the segregated population when crossed with other wheat varieties,in which the ideal plants with moderate plant height,longer spike,and more grains per spike could be selected with more chance,assuming that AS34 would be potentially used in wheat breeding.