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• W616409635 abstract "Although the reliability of molecular techniques employed in maize breeding have iinproved, field evaluation of maize hybrids -will be an integral part of maize breeding for the foreseeable future. Since 1970, concern of the genetic diversity of maize hybrids has increased. This study examined the response of a field method for estimating genetic diversity values (GDV) among maize hybrids. This method relies on the positive association between genetic diversity and heterosis, and the genetic principle that an hybrid either sibbed or selfed produces the same Fg gene frequency. Values should range from 0 (no diversity) to 1 (complete diversity) Thirty-six comparison sets of hybrids of varying levels of Reid Yellow Dent and Lancaster Sure Crop genrtplasm were examined using GDV. Comparison sets were grown in a randomized complete block design at six Iowa environments and at one Illinois environment. Genetic diversity values were calculated by two methods; based on comparison set means (GDVI) and based on entry means (GDVli) . For grain yield, both methods gave similar values and were highly correlated (r = 0.94**) . Genetic diversity values calculated by GDVI are prone to substantial errors. The standard error of a GDVI mean for grain yield was 0.15. No comparison x environment interaction for grain yield GDVI, however, was observed. Of eight traits examined, grain yield GDV values were most accurate with respect to pedigree. Despite the potential for error, GDVI and GDVI I generally were able to distinguish among comparisons of hybrids with zero, one or both parents in common. The comparison of identical hybrids (B73 x Mol7 vs. B73 x Mol7) had values of -0.046 and -0.01 for GDVI and GDVI I. Genetic diversity values for comparisons not involving a common parent ranged from 0.77 to 1.12 and 0.71 to 1.097 for GDVI and GDVII, respectively. Both GDVI and GDVII are less reliable for comparisons of hybrids sharing a common parent. For each method, values for four comparisons among hybrids overlapped with the range of values for comparisons not involving a common parent. Each of the four comparisons were composed of greater than 50% Reid Yellow Dent genrtplasm. It is unclear whether these deviations were" @default.
• W616409635 created "2016-06-24" @default.
• W616409635 creator A5075342529 @default.
• W616409635 date "2018-08-13" @default.
• W616409635 modified "2023-10-16" @default.
• W616409635 title "Genetic diversity analysis of a set of public maize hybrids" @default.
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• W616409635 doi "https://doi.org/10.31274/rtd-180813-11581" @default.
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