Three elite self-lines, YL1732, YL8234 and QIL3233, were bred by the above method in 1998. YL1732, a yellow semident self-line based on 75% subtropical germplasm and 25% temperate germplasm, was selected from 3 generations of inbreeding and 5 generations of self-inbreeding. Better performance was YL8234, an early maturing yellow flint self-line made up of 50% subtropical germplasm and 50% temperate germplasm. QIL3233, an intermediate to early maturing yellow dent material, was based upon inbreeding 4 generations and self-inbreeding 5 generations of temperate population 32 subtropical pool33. At present, these self-lines are used for breeding elite maize hybrids in summer planting corn region in China.
The evaluating experiments of selected
self-lines in Jinan showed that disease indices of maize leaf blight (Helminthosporium
turcicum Pass.) and leaf spot (Helminthosporium maydis Nisik.)
decreased 61.5% to 78.9% and 53.8% to 69.4% respectively. Plant rates of
maize stalk rots (Fusarium graminearum and moniliforme) and
maize rough dwarf decreased 84.1% to 93.2% and 86.7% to 98.2%. Number of
green leaves at maturity increased 2.6 to 4.4 times, and average grain
yield also increased 20.0% to 55.6% respectively.
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