<![CDATA[Selection for increased oil level in maize showed the increase wasassociated with decrease in starch concentration, kernel weight,and grain yield. The study was conducted with the objectives:(1) to evaluate response to six cycles for increased grain yieldin the high oil maize Alexho Elite (AE: 60-90 g kg-1 oil concentration)and Ultra High Oil (UHO: 100-140 g kg-1 oil concentration)using inbred tester B73; (2) to measure responses toselection for increased grain yield with changes in yield components;and (3) to determine a suitable tester. Previously the twosynthetics had been selected for oil concentration. After six cycles,the six genotypes i.e. AE C0, AE C3, AE C6, UHO C0, UHO C3,and UHO C6 were testcrossed to B73, LH185, and LH202 inbreds(40 g kg-1 oil concentration) to a total of 18 testcrosses. Twofield experiments were used to evaluate selection in AE and UHOtestcrosses. The study showed selection using inbred tester B73in AE and UHO was effective in increasing grain yield of AEtestcrosses without changing (i.e. decreasing) oil and proteinconcentrations. AE testcrosses produced higher grain yield andgreater selection response for grain yield than UHO testcrosses.LH185 was best for grain yield in AE and UHO testcrosses. Increasein grain yield in most of the testcrosses was associated withincreases in starch concentration, kernel weight, kernel number, andgrain weight.]]>
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