Relationship Of Leaf Traits And Quality Of Flue-cured Tobacco

The test was performed at Shanghai tobacco base unit in Jia county of Henan province in 2014. The tested materials of 44 flue-cured tobacco varieties have been analyzed the interspecies mutation of the leaf traits, the density of glandular hair, leaf surface secretion, routine chemical components and neutral aroma components content. Trends of tobacco leaf quality on different leaf trait levels. The main conclusions are as follows:(1) There’s a large difference between the leaf traits of the test flue-cured tobacco varieties. The length of tobacco leaf is 67.1cm; the average leaf width is 32.5 cm; the average length-width ratio is 2.2; the changing range is 1.5-2.8; the average leaf area is(1346.8cm2), the sample can be divided into long ellipse, ellipse and broadly ellipse.(2) The research of the relationship between the leaf length and glandular hair density, the leaf surface secretion suggests that, with the leaf length increases, the glandular hair density and the content of leaf surface secretion increases firstly and then decreases. The correlation between the the glandular hair density and the content of leaf surface secretion is not significant.(3) The research of the relationship between the leaf width and the density of glandular hairs, the leaf surface secretion shows that the trends of glandular hair density and leaf surface secretion go down with the rise of the leaf width. The width and the density of glandular hairs, the leaf surface secretion present a significantly negative correlation.(4) The research of the relationship between length-width ratio and the density of glandular hairs, leaf surface secretion demonstrates that with the length-width ratio increases, the trends of glandular hair density and the content of leaf surface secretion goes up. Length-width ratio and the density of glandular hairs, leaf surface secretion show the significantly positive correlation.(5) The research of the relationship between the leaf area and glandular hair density, leaf surface secretion showed that the glandular hair density increases first and then decreases with the increase of leaf area. However, the correlation of leaf area and glandular hair density, leaf surface secretion is insignificant.(6) The analysis of the relationship between leaf length and routine chemical components reveals that: the content of reducing sugar, total sugar of leaves have a uptrend, and nicotine and total nitrogen contents in leaves increases first and then decreases with the leaf length increases. The variation equation of total sugar, nicotine content changed with leaf length could be defined as y = 0.2606 x + 2.2333, y = 0.0046x2 + 20.5957 + 21.685 and the regression reaches the significant level.(7) The analysis of the relationship between leaf width and routine chemical components reveals that: the content variation of reducing sugar, total sugar, nicotine and total nitrogen of leaves have a uptrend, and nicotine and total nitrogen contents in leaves could be defined as equations: y =0.026x2 + 2.102x- 18.071, y =0.0212x2 + 1.7974x- 9.4568, y=0.0036x2 + 0.2737x- 7.4042. The regression reaches the significant level.(8) The analysis of the relationship of length-width ratio and routine chemical components suggests that, variation trends on the reducing sugar and total sugar content decrease with the increase of length-width ratio,but the content of total nitrogen and nicotine increase. The relationship between Length-width ratio and total nitrogen, nicotine content could be described as: y = 0.3993x2- 1.0546 x + 2.338, y = 1.0232x2- 4.0379 x + 34.663,y =3.4995x2- 21.947 x + 55.294. The regression comes up to the significant level.(9) The analysis of the relationship between leaf area and routine chemical components demonstrates that reducing sugar and total sugar content increases with the increase of the leaf area. The variation trend of total nitrogen decreases with the increase of leaf area.(10) The analysis of the relationship between the leaf length and neutral volatile aroma components reveals that: the products of Maillard reaction have a significant difference in groups of different leaf length, which performs as the lowest Maillard reaction products in the range of 64.2cm-73.8cm of leaf length in groups, and high in Maillard reaction products’ content ranged from 58.7cm to 63.7cm, 53.8cm to 58.3cm between two groups. Other neutral aroma components have no significant difference between the groups.(11) The analysis of the relationship between leaf width and neutral volatile aroma components demonstrates that the products degraded by cembranoids, neoplytodiene, products of Maillard reaction, products degraded by carotenoids are lowest in the range of 31.8cm-38.9cm of leaf width, in the middle at the range of 28.8cm-31.5cm of leaf width, and the highest in the range of 24.2cm-27.8cm of leaf width. The difference in groups is significant. There is no significant difference between groups of products degraded by Aromatic amino acid and cembranoiods.(12) The analysis of length-width ratio and volatile aroma substances suggests that the neophytodiene, Maillard reaction products, products degraded by carotenoids have the highest average content in the range of 2.2-2.7 of length-width ratio; the average contents are in the middle at the range of 18-2.2 of the length-width ratio;the average contents are the lowest in the range of 1.5-1.8 of the length-width ratio. There is no significant difference between aromatic amino acid degradation products and cembranoiods.(13) The analysis of the relationship between leaf area and neutral volatile aroma components reveals that, in the 1476.1cm2-1753.6cm2 of leaf area, the Maillard reaction products and neophytodiene contents are the lowest; there is relatively high contents in the range of 1207.8cm2-1462.4cm2 and 762.1cm2-1198.4cm2 in two groups. The aromatic amino acid degradation products and cembranoiods vary insignificantly between groups.