| Understanding waxy maize genetic mechanism of photosynthetic traits and ear traits for high photosynthetic efficiency for the waxy corn breeding and production provides an important theoretical basis for breeding. In this experiment, eight different genetic basis of waxy maize inbred lines (JN2, JN4, JN7, JN8, JN10, JN12, JN14, JN15) are used parents, hybrid method completely double has matched stack of 56 hybrids combinations in 2009, Eight parental inbred lines and F1 hybrids planted in Jilin Agricultural University experimental field in 2010, and the genetic studies (heterosis, combining ability, genetic parameters, etc.)of photosynthetic traits of the late silking (photosynthetic rate, transpiration rate, chlorophyll SPAD values, stick three leaf area) and panicle traits (ear length, ear diameter, bald length, rows per ear, kernels per row, kernel weight, yield) and genetic correlation for each trait were analysis, tested parents and hybrids were evaluated, selected a better combination of parental inbred lines and advantages, the main results are as follows:1. Heterosis analysisThe hybrid combinations of 56 in super kiss kiss advantages and advantages analysis shows that in addition to the length of bald, the other characters in the mid-parent advantage, whether or heterobeltiosis, the number of positive advantages are greater than the negative combination of advantages. In photosynthetic traits, JN2×JN8, JN4×JN12, JN7×JN8, JN8×JN14, JN10×JN7, JN12×JN2, JN14×JN10 and other combinations with strong heterosis; In spike traits, JN2×JN14, JN4×JN8, JN7×JN4, JN12×JN2, JN12×JN8, JN14×JN2, JN14×JN4 and other combinations with strong heterosis, heterosis of these combinations are positive and large value (excluding the length of bald), the use of larger value.Quantitative traits of hybrid combinations of the order of preference index yield> kernels per row> transpiration rate> bald length> ear length> photosynthetic rate> leaf area> kernel weight> ear diameter> ear rows> chlorophyll SPAD values, strengths index coefficient of variation in the order of bald length> transpiration rate> plot yield> photosynthesis> kernels per row> leaf area> ear length> rows per ear> kernel weight> ear diameter> chlorophyll SPAD values. Show that the photosynthetic rate, transpiration rate, leaf area, bald length, kernels per row, the district has a large yield advantage index and coefficient of variation, breeding a few of these traits have a greater choice, choice relative to other traits smaller.2. Combining ability analysisDifferent inbred lines of the GCA effects of parents are quite different in same trait. In photosynthetic traits, the parental inbred lines with higher GCA effects JN2 and JN7, two inbred lines in the overall performance of the photosynthetic performance of good character, high photosynthetic efficiency in maize breeding in the parent as well; in Spike traits, JN7, JN8, JN10 better overall performance, it has good value in waxy maize breeding..Different hybrid combinations of the same character quite different SCA effects. In photosynthetic traits, JN2×JN8, JN4×JN14, JN7×JN10, JN8×JN14, JN10×JN15 as the combination performed better; ear yield traits, JN2×JN12, JN2×JN15, JN4×JN8, JN7×JN12, JN7×JN14 as the combination of better performance.Different hybrid combinations of the same character quite different RCA effects. In addition to ear length traits, other traits of the RCA effects were achieved very significant levels of cytoplasmic expression of genes in the genetic traits play an important role. In photosynthetic traits, JN14×JN2, JN15×JN10 such as better anti-cross combination of high light efficiency; In ear traits, JN12×JN2, JN15×JN10 as the production of better breeding combination.The same traits in different combinations quite different TCA effects. JN2×JN8, JN2×JN14, JN4×JN12 in photosynthetic traits such as TCA combined effect of better performance, JN7×JN8 JN7×JN14, JN2×JN10 other combinations performed better in terms of ear traits.3. Traits and combining ability of the type of relationshipDifferent types of combining ability of hybrid combinations of traits play a role in varying degrees. In 11 traits, in addition to photosynthesis, other hybrid combinations of the traits associated with female than male close, so the choice of the parents should be more depending on the choice of the female parent. The total number of characters with the power and performance of hybrid combinations have reached a very significant relationship; it can be used to predict the total effect of combining ability of the performance of each trait situation.4. Heritability analysisTest the genetic composition of the quantitative traits are different, the role of genes is also inconsistent. Photosynthetic rate, transpiration rate, the broad heritability of cell production are very high, indicating that traits mainly affected by genetic factors; leaf area, ear length, ear diameter, number of rows affected by genetic factors, general; chlorophyll SPAD values, bald length, kernels per row, kernel weight lower by genetic factors, environmental factors influenced. Leaf area of genetic additive effect of genes is more important, other traits of non-additive effect of genes are more important. Narrow sense heritability of the quantitative traits are not high, indicating poor stability of the traits, the non-additive effect of genes on the traits of a larger selection of characters should be carried out at high generation.5. Correlation and Path AnalysisDistrict yield and other properties are significant or significant positive correlation except bald length. kernels per row on the yield the greatest impact, followed by the ear length and ear diameter. Therefore, in waxy maize breeding, the number should fully consider all the relevant characters and plot yield, especially kernels per row, ear length, ear diameter, and kernel weight correlated traits to a larger location on the priority, the choice of emphasis on these traits, other traits related degree may be relaxed little choice.
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