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In coder to explore the spectrum characteristics of tobacco leaf and its relationship with SPAD value in the field of different maturity, the differences of hyperspectral reflectance, location, area and vegetation variables of different maturity tobacco leaf were analyzed. Correlation analysis and stepwise regression method were used to determine the relationship between hyperspectral parameters and SPAD values. The results showed that with increasing maturity, the reflectance in the visible range (480-680 iim) gradually increased, especially in the 500 - 660 urn range for the reflectance of tobacco leaf maturity better distinguishing effect. In the near-infrared region, with increasing maturity, the reflectivity of tobacco generally showing a decreasing trend. Trend red edge area of tobacco is as follows: first and then decrease; blue border area with increasing maturity increasing; SDr / SDb value and (SDr - SDb) / (SDr + SDb) value decreases and the difference between the maturity reached significant or highly significant. The prediction effect of the regression equation of SPAD value of the Red Valley reflectance is better, and it is feasible to build a regression model based on the high spectral characteristic parameter to predict the SPAD value. [ABSTRACT FROM AUTHOR]

【Objective】 The joint segregation analysis method of mixed major gene plus polygene genetic model was used to study the inheritance of curing characteristics in flue-cured tobacco. Recombinant inbred lines derived from ‘Yunyan 85’ × ‘Dabaijin 599’ were investigated. 【Method】 The breeding lines were different from one another in curing traits. ‘Yunyan 85’ with excellent easy curing trait and holding curing potential was used, while ‘Dabaijin 599’ was low-quality in curing characteristics. 【Result】 It was found that easy curing trait appeared to be a quantitative trait and the inheritance fit to a model of four major genes with additive-epistatic effects. Genetic effects were mainly controlled by additive effects of the first and second major genes. Heritabilities of the major genes were estimated to be 95. 98 %. The inheritance of holding curing potential fit to a mixed genetic model of two major genes with additive-epistatic effects plus polygenes with additive-epistatic effects. The additive effects of major genes were negative and the epistatic effects were also important. Heritabilities of the major genes and polygenes were estimated to be 54. 26 % and 17. 82 % respectively. 【Conclusion】 The inheritance of curing characteristics in flue-cured tobacco is controlled by major genes. [ABSTRACT FROM AUTHOR]

[Objective]The study aims to investigate the feasibility of using color parameters to estimate the curing characteristics of fresh flue-cured tobacco leaves in maturity process. [Method] The color parameters of flue-cured tobacco leaves with different maturity were measured by color difference meter and curing characteristics were studied through the black box testing using flue-cured tobacco NCI 02 middle leaves. Cured-leaves were taken to verify the curing characteristics of different maturity fresh flue-cured tobacco leaves. [Result] The result shows that color values of front and back of flue-cured tobacco leaves had similar changing trend with the enhancement of leaves maturity. The relationship between color parameters(L ,b ,C) and maturity of tobacco leaves was statistically significant, which could be used to distinguish maturity. [Conclusion]The curing characteristics of flue-cured tobacco leaves with different maturity were different. The Fisher discriminant function based on color parameters can be used to identify different maturity leaves. Color parameters could be used as an auxiliary index to judge the curing characteristics of fresh flue-cured tobacco leaves. [ABSTRACT FROM AUTHOR]