Analysis Of Heredity In Droug Ht-resistant Maize Seedling Stage For Root Morphology Index

With the increasingly severe drought, people increasingly high requirements for cropdrought resistance. Maize is an important food crop in people’s lives has been playing animportant role, so the significance of the study for its drought resistance. Root as a moistureabsorption organ works closely with the relationship between drought resistances of maize,has become the hotspot, this experiment using hydroponics method of corn seedling roottraits were used in genetic analysis.1Under drought stress and normal conditions of MRL Separately by oneadditive--dominance major gene plus additive--dominance--epistasis polygene mixedinheritance mode and one negative complete dominance major gene plusadditive--dominance polygene mixed inheritance model. Genetic Under drought stress BC1,BC2and F2were31.97%,25.35%,27.86%,Genetic Under normal conditions11.51%、24.36%,29.14%. Under two environments the main root long heritability is low also thechange is big, the showing main root long heritability is low, the environmental condition isbig to its influence.2Under drought stress and normal conditions of TRL Separately by two additive--dominance--epistasis major genes plus additive--dominance--epistasis polygene mixedinheritance model and two additives--dominance--epistasis major genes plus additive--dominance polygene mixed inheritance model. Genetic Under drought stress BC1, BC2andF2were83.23%,84.23%,93.61%,Genetic Under normal conditions85.17%,74.9%,75.72%.In two environments the TRL had higher rates of genetic, indicating high heritability of theTRL and effects of environmental conditions on small, stable inheritance.3Under drought stress and normal conditions of LTN Separately by two additive--dominance--epistasis major genes plus additive--dominance--epistasis polygene mixedinheritance model and two additives--dominance--epistasis major genes plus additive--dominance polygene mixed inheritance model. Genetic Under drought stress BC1, BC2andF2were83.49%,84.54%,84.68%,Genetic Under normal conditions79.16%,73.73%,89.52%.In two environments the LTN had higher rates of genetic, indicating high heritability of the LTN and effects of environmental conditions on small, stable inheritance.4Under drought stress and normal conditions of PA by twoadditives--dominance--epistasis major genes plus additive--dominance polygene mixedinheritance model. Genetic Under drought stress BC1, BC2and F2were72.48%,87.21%,79.04%, Genetic Under normal conditions57.55%,51.84%,48.97%. In two environments theFWR heritability change is not big, indicating environmental conditions have an impact,genetic is not stable enough.5Under drought stress and normal conditions of SA all Separatel by twoadditives--dominance--epistasis major genes plus additive--dominance polygene mixedinheritance model. Genetic Under drought stress BC1, BC2and F2were72.48%,87.21%,79.04%,Genetic Under normal conditions71.34%、63.95%和72.13%. Intwo environments the SA had higher rates of genetic, indicating high heritability of the SAand effects of environmental conditions on small, stable inheritance.6Under drought stress and normal conditions of RV by one additive-dominance majorgene plus additive-dominance-epistasis polygene mixed inheritance mode and twoadditives--dominance--epistasis major genes plus additive--dominance polygene mixedinheritance model. Genetic Under drought stress BC1, BC2and F2were74.87%,79.44%,58.63%,Genetic Under normal conditions67.64%,65.05%,78.55%. Undertwo environments the RV heritability change is not big, the showing environmental conditionis not big to its influence, the heredity is relatively stable.7Under drought stress and normal conditions of FWR by one additive-dominancemajor gene plus additive--dominance--epistasis polygene mixed inheritance mode and twoadditive--dominance--epistasis major genes plus additive--dominance polygene mixedinheritance model. Genetic Under drought stress BC1, BC2and F2were74.51%,80.16%,53.86%,Genetic Under normal conditions49.69%,62.99%,43.03%.In twoenvironments the FWR heritability change is not big, indicating environmental conditionshave an impact, genetic is not stable enough.8Under drought stress and normal conditions of RSR all by twoadditives--dominance--epistasis major genes plus additive--dominance polygene mixedinheritance model. Genetic Under drought stress BC1, BC2and F2were49.77%,49.27%,38.78%,Genetic Under normal conditions46.06%,65.33%,48.31%Under twoenvironments the RSR heritability change is not big indicating environmental conditions havean impact, genetic is not stable enough. Drought type material it’s excellent of drought sexual with developed of roots has closeof relationship. This study shows that: the TRL、 LRN、 SA、RV in the3groups had higherheritability, can stable genetic, through effective selection in hybrid progeny population in theimprovement of these traits.FRW、RSR shoot ratio, low rate of genetic, genetic instability, butthey are in the B2group had a higher heritability, through effective selection in the B2groupwere carried on the improvement of these traits. The corn production mainly uses F1theheterosis, under flood and drought condition total root long, lateral root number, root surfacearea by two pairs additive--Dominance--Epistasis cardinalia control, therefore screens hasthese character inbred line has the significance to the breeding work.