engleski

Improvement of stalk rot resistance and grain yield in the maize synthetic FAOSYNFR1B by recurrent selection

Two cycles of simultaneous selection for stalk rot resistance and grain yield have been conducted in the FAOSYNFR1B population synthesized from Eastern European maize germplasm. The objectives of this study were: 1) to compare expected genetic gain from S1 and HSI methods of selection in the second cycle and 2) to evaluate improvement (gain) of stalk rot resistance and grain yield in the population per se associated with two cycles of selection. In the first cycle of selection, S1 method and HSI method (using an inbred tester) were combined (S1-HSI) to produce C1 population. In the second cycle of selection the S1 and HSI methods were applied separately to produce C2(S1) and C2(HSI) populations, respectively. In 1996, the C0, C1, C2(S1), and C2(HSI) populations per se were evaluated at four locations in natural conditions and at one under artificial stalk infection. Combined S1-HSI method was successful in improving both stalk rot resistance and grain yield. In the second cycle, further improvement for stalk rot resistance was observed with a more favorable response for S1 method. Neither S1 nor HSI method, applied separately in the second cycle, were successful in improving grain yield. Therefore, combining of S1 and HSI methods of recurrent selection seems to be more effective way in simultaneous improvement of stalk rot resistance and grain yield in maize.

maize; recurrent selection; S1 method; HSI method; stalk rot resistance; grain yield

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