The Study Of Near-infrared Spectroscopy And Genetic Analysis On Maize Quality Traits

Maize is one of the most important crop species. With the development of economy and marketrequirement, it is paid more attention to the genetic improvement of Maize quality. The key problem toincrease the breeding efficiency is how to meature the quality of maize, therefore. In this study, onehundred and twenty-five maize inbred line species which shows different qualities were used as researchmeterials. Firstly, choosing Partial Least Squares regression, spectral preprocessing and mathematicaltreatment were employed to analyze the full spectrum segment. Models were built on protein, starch, andoil content in this rearch. Then, the models were used to meature protein, starch, and oil content of sixgenerations (P1, P2, F1, B1, B2and F2) of3crosses in the next study. The joint segregation analysis of majorgenes plus polygenes mixed inheritance model was conducted to study the genetic rules of protein content,starch content and oil content.1It was four of the best combination of Derivative Treatment Gap and Smoothing in the three qualitycontent of maize. To selected the best model with different spectral preprocessing and mathematicalapproach combining. The better group of protein was the Second Derivative plus Weighted MultiplicativeScatter Correction, starch was the Second Derivative Standard Normalization plus Scattering Treatment, oilwas the First Derivative plus Scattering Treatment. It was used to external validation of the calibrationmodels of the three maize qualitiy contents, the correlation coefficients were0.985,0.946,0.952, especialy.2The optimal model was model E-1in protein conten above Cross I and cross Ⅲ. The two crosseswere dominated by major genes. The major genes of the two crosses were negative superdominance, theepistasis cumulative was negative. The polygenes of cross I was negative superdominance, cross Ⅲ showedpartial dominance. It had the highest heritability of major genes plus polygenes in F2generation of cross Iand in B2of cross Ⅲ. Cross Ⅱ was model C-0. It didn’t esist of major genes. It had the highest heritabilityof major genes in F2generation. The polygenes were positive superdominance. Environment had an impacton the protein content.The optimal model was model E-1in starch content above Cross I and cross Ⅲ. The two crosses weredominated by major genes. It had the highest heritability of major genes plus polygenes in F2generation.The major genes of cross I was positive superdominance. The polygenes were negative superdominance, and the epistasis cumulative was negative. The major genes of cross Ⅲ were diffreent, one pointed positivesuperdominance, the other was negative superdominance. For starch content of the cross Ⅱ was model D-2.It didn’t detected polygenes in B1,B2and F2generations were dominated by polygenes. It had the highestheritability of major genes plus polygenes in F2generation. The additive effect of major genes was positive,polygenes was negative superdominance.The optimal model was model D-2in oil content above the three crosses. Cross I was dominated bymajor genes and had the highest heritability of major genes plus polygenes in F2generation. The additiveeffect of major genes was positive, polygenes was negative superdominance. The oil content in cross Ⅱ, itdidn’t detected major genes in B1and didn’t detected polygenes in B2.It had the highest heritability ofmajor genes plus polygenes in F2generation. The additive effect of major genes was positive, polygeneswere positive superdominance. Cross Ⅲ was dominated by polygenes. It had the highest heritability ofmajor genes plus polygenes in F2generation. The additive effect of major genes were positive, polygeneswere negative superdominance.