| 摘要: |
| 【目的】探讨烤烟上部8片烟叶质量差异产生的生理机理，为指导上部叶采收调制以及工业企业在特定叶位挑选优质原料提供参考。【方法】以烤烟品种云烟87为材料，研究成熟期烤烟上部8片叶每位叶的光合特性和烤后烟叶单叶质量，并采用聚类分析法对光合特性相近的叶位进行分组，比较单叶质量与光合特性的叶位效应。【结果】随着叶位的降低，烤烟叶片的净光合速率、气孔导度和蒸腾速率明显下降，其中倒3~8位叶净光合速率较倒1叶显著降低了9.79%~27.68%，但各叶位胞间CO2浓度差异不明显。对各叶位光合特性的聚类分析表明，上部8片叶可分为倒1~2叶、倒3~5叶、倒6~7叶和倒8叶4个叶组，其单叶质量分别为8.68~8.79，9.86~10.05，10.32~10.43和10.80 g，组内差异不显著，不同组间差异显著，其叶位效应与光合特性的叶位效应相似。【结论】云烟87上部8片叶光合特性和单叶质量叶位效应相似，光合特性是烟叶质量差异形成的主要生理基础。 |
| 关键词: 烤烟 上部8片叶 光合特性 单叶质量 聚类分析 |
| DOI： |
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| 基金项目:广东中烟工业有限责任公司科技项目（2016440000340013）；广东省烟草专卖局（公司）科技项目（2019440000200035）；湖南省烟草公司衡阳市公司科研项目（201743040024098） |
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| Cluster analysis of photosynthetic characteristics of upper leaves and leaf position effect of single leaf weight in flue-cured tobacco |
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LEI Jia,YE Weiguo,SHAN Xuehua,et al
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| Abstract: |
| 【Objective】This study explored physiological basis of differences in quality of the eight leaves in the upper part of flue-cured tobacco to provide reference for harvesting,modulation and selection of high-quality raw materials for industrial enterprises in specific leaf positions.【Method】The flue-cured tobacco variety Yunyan 87 was selected to study photosynthetic characteristics and single leaf weight after roasting of top eight leaves.The leaf positions with similar photosynthetic characteristics were grouped by cluster analysis,and leaf position effects of single leaf weight and photosynthetic characteristics were compared.【Result】With the decrease of leaf position,net photosynthetic rate,stomatal conductance and transpiration rate of flue cured tobacco leaves decreased significantly.The net photosynthetic rate of the inverted 3-8 leaves was significantly decreased by 9.79%-27.68% compared with that of the first leaf,but there was no significant difference in intercellular CO2 concentration among leaves.Clustering analysis showed that the upper eight leaves could be divided into four leaf groups of inverted 1-2 leaves,inverted 3－5 leaves,inverted 6－7 leaves and inverted 8 leaves.The single leaf weights of these four groups were in the range of 8.68－8.79 g,9.86－10.05 g,10.32－10.43 g and 10.80 g,respectively.The differences were insignificant within same groups,but significant among different groups.The leaf position effect of single leaf weight was similar to that of photosynthetic characteristics.【Conclusion】 The photosynthetic characteristics of the upper eight leaves of Yunyan 87 were similar to the leaf position effect of single leaf weight,that photosynthetic characteristics was the main physiological basis for formation of quality differences in tobacco leaves. |
| Key words: flue-cured tobacco top eight leaves photosynthetic characteristics single leaf weight cluster analysis |
