Analysis Of High Starch Maize New Variety Breeding And Characteristics

In this study, using25hybrids as materials, studies on comparative experiment for grain yields, determination of starch content based on dry weight, screening of new varieties and local trails were conducted. The hybrids used here were produced by crossing the newly developed high starch content inbreds, JN128、JN154、JN503、 JN575and JN583by domestic core inbreds with high starch content Changji7-2, Zheng22, Zheng58, MO17and Dan340. The results showed that,(1) The starch content of newly developed inbreds varied from69.9%to76.6%, with average value of73.5%, slightly higher than other domestic inbreds whose starch content were ranged from69.0%to72.0%with average value of70.8%. Among these, the new inbred line JN154expressed the highest in starch content of76.4%;(2) Among the hybrids,"Jikeyu13"(JN154×Zheng58) has the most amount of starch with76.2%, higher than the control "Xianyu698" with75.0%by1.5%;(3) In Jilin local trial in2012,"Jikeyu13" expressed excellent properties, and it produced the highest grain yield exceeding the control by19.6-30.0%in all experiment locations, and its grain yield ranked number one;(4) High starch varieties "Jikeyu13" was highly resistant to southern and northern corn blight disease, moderately resistant to Curvularia Leaf Spot, stem rot and maize dwarf mosaic B, but sensitive to corn borer;(5) Mid-parent and high parent heterosis and heterosis in starch content compared to control were quit low. Mid-parent heterosis was highly correlated to high-parent heterosis (P<0.01), although correlations of mid-parent and high-parent heterosis with heterosis in starch content compared to control was not reached at significant level (P>0.05).