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SM ISO690:2012 MIKHAILOV, Mihail. Inheritance of drought tolerance in maize backcross generations. In: International Congress of Geneticists and Breeders from the Republic of Moldova, Ed. 11, 15-16 iunie 2021, Chişinău. Chișinău, Republica Moldova: Centrul Editorial-Poligrafic al Universităţii de Stat din Moldova, 2021, Ediția 11, p. 105. ISBN 978-9975-933-56-8. DOI: https://doi.org/10.53040/cga11.2021.083 |
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International Congress of Geneticists and Breeders from the Republic of Moldova Ediția 11, 2021 |
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Congresul "International Congress of Geneticists and Breeders from the Republic of Moldova" 11, Chişinău, Moldova, 15-16 iunie 2021 | |||||||
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DOI: https://doi.org/10.53040/cga11.2021.083 | |||||||
CZU: 631.52:633.15 | |||||||
Pag. 105-105 | |||||||
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Different lines may contain different genetic factors favorable for drought tolerance, which when combined in one genotype, can mutually enhance their effect. In the case of non-allelic interaction of major genes, the presence of such factors can be detected by analyzing trait distribution in segregating generations. Analysis of drought tolerance in maize MK01×A619 hybrid combination was carried out, where significant role of non-allelic interactions was previously found. Method: Maize backcross populations (MK01×22a)×22a and (A619×22a)×22a were tested in drought 2020 year, where 22a is the double haploid line derived from MK01×A619, in which the both parental genomes are combined. The following traits were measured: tassel and ear flowering, flowering gap, cob weight, kernel set, grain yield at 10% moisture. Productivity of the studied genotypes decreased compared to the typical years by 7-36 times. The tassel flowering was delayed by 3-9 days, the ear flowering was delayed even more. Non-allelic interactions were tested by the deviation of the mean backcross values from expected ((МК01×22а)+22а)/2 and ((А619×22а)+ 22а)/2. Phenophases and cob weight did not manifest non-allelic interactions, and for kernel set and productivity non-allelic interactions persist, especially in MK01×22a×22a, where deviations are significant with P<0.001. Kernel set and productivity in MK01×22a×22a show a bimodal distribution, as opposed to the unimodal one in the original MK01×22a hybrid. In the backcross population there is a fraction of increased kernel set and productivity, which is absent in the original hybrid. The presence of such a fraction can be explained by the transition of certain favorable genetic factors into homozygous state. Such factors must be recessive or semidominant and inherited in the 22a line from A619. This means that selection for drought tolerance in MK01×A619 has certain perspectives. Conclusions: 1) Non-allelic interactions involved in the genetic control of grain yield in the maize hybrid MK01×A619 are also manifested under drought conditions; 2) The recessive nature of the interacting factors inherited from the A619 line and the dominant nature ones inherited from the MK01 line remains in drought conditions too |
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