The Breeding Potential Analysis Of 21 New Election And Common Maize Inbred Lines

This article used 21 maize inbred lines which commonly used and selects newlyby Maize Research Institute of Sichuan Agriculture University and 210 crossescombined by 21 inbred lines according to the Griffing method 4. We analyzedagronomic and economic traits of 21 maize inbred lines through phenotypicscharacterization analysis, then analyzed their heterotic groups by SSR molecularmarkers. The results showed that,1. Variance was significant in all inbred line main observed traits, but at the sametime the most of traits were impacted by the sowing season and genotype×sowingseason. The proportion of the type of middle stem and middle yield is bigger. Both thetype of tall stem and high yield and type of middle stem and high yield had smallerproportions in all of inbred lines, and any of the short stem inbred lines belong to highyield type. Through comprehensive analyzing it shows that, lines-of6054, 6070, 48-2, 6057and RP128 were outstanding in agronomic and economic traitsin all of inbred lines.2. The differences of the 8 main economic traits between the combinations toachieve a significant at 0.01 level. The effects of sowing season and sowing seasoninteraction combination prominence. The analysis combining ability with the methodof D.Singh showed that all traits in general combining ability effect highly significantdifference between the inbred lines. Apart from the combination of yield per plant, thenumber of row and the row grains special combining ability effect of the mostsignificant differences, the other traits were not statistically significant. Generalcombining ability more accessible with sowing-season than special combining ability.Yield general combining ability effect of the high value inbred lines appeared higherfrequency of high-yield combination. We pay attention to general combining abilityof inbred lines should not overlook the special combination of combining ability.Comprehensive analysis each of trait general combining ability performance showsthat inbred lines 6070 and 6057 have the high general combining ability in an ear of trait and yield per plant, also the most of their crossed combinations have high specialcombining ability, they should belong to the high combining ability inbred lines.3.In the results of SSR mark analysis showed that, the change extension ofgenetic distances among in the inbred lines is 0.51～0.91, the average geneticdistance is 0.71±0.0181, introduced 4 standard examination lines which representdifferent heterotic group to carries on the cluster analysis, the change extension ofgenetic distances among in 25 inbred lines is 0.51～0.96, the average geneticdistance is 0.74±0.0153. Carries on the cluster analysis with the UPGMA method, atgenetic distance is 0.87, 25 inbred lines clustered to 5 heterotic groups. The inbredline is 478, 6038, 6035, RP128, 6037, 6019, R08, R18, 6054 gathers for the first biggroup, in this class group includes the standard examination to plant 478, shouldbelong to the Reid group; Dan 340, 48-2 gathers for the second big group, in thisgroup includes the standard examination to plant Dan 340, should belong to theLudahonggu group; Huangzao4, 6062, 6033, 6057, 6063, 6070, ES40, 6049, 6013, new 698-3 gathers early for the third big group, in this group includes the standardexamination to plant Huangzao4, should belong to Sipingtou groups; L790, 6057, Mo17 gathers for the fourth big group, in this group includes the standardexamination to plant Mo17, should belong to the Lancaster group; P14 is the geneticis away from with other inbred lines far also has not planted with the standardexamination gathers in the same place, possibly belongs to other groups, decides asthe fifth big class group.13 select is newly has 8 to gather into Sipingtougroups. Although the genetic diversity of the maize inbred line to have certainimproved, their hereditary basis is relative quite narrow.4.Strong superiority combination pair pattern analysis result indicated that, thecomparison superiority precedes 20 combinations (Table 14), some 13 combinationgroup formula type for Reid×Sipingtou. Indicated this superiority pattern also willpossibly have the big development superiority in the future t maize breeding.