不同生态条件对烤烟形态及相关生理指标的影响

选云南玉溪主产烟区红塔区大营街镇、通海县四街镇和峨山县小街镇三个不同生态环境下种植烤烟K326，探讨烤烟形态和生理差异及其影响因子。结果表明：大营街的烤烟形态性状最好，四街烤烟形态性状最差。三个试验点烤烟叶绿素含量、叶绿素a/b比值及类黄酮含量均没有显著差异，其中尤以四街烤烟类胡萝卜素含量、可溶性蛋白含量最高，而叶绿素/类胡萝卜素比值最低，均与其余地点有显著差异。Pnmax、LCP和LSP的大小顺序为四街＞大营街＞小街。光强在800~1000 mol?m-2?s-1范围内时，Ci、Gs和Tr为大营街＞小街＞四街，WUE为四街＞小街＞大营街。用灰色关联法对影响烤烟形态及生理特征的主要生态因子进行分析，对K326茎高、中部叶叶面积、类黄酮含量、丙二醛含量和叶绿素含量影响最大的生态因子分别是光照度、日平均气温、降水量、UV-B辐射和日照时数；而土壤氮含量是影响类胡萝卜素含量、可溶性蛋白含量和最大净光合速率的主要因子。

Effects of ecological conditions on morphological and physiological characters of tobacco

The effects of different ecological conditions on morphological and physiological features in squaring stage of tobacco cultivar K326(Nicotiana tabacum L cv.K326) were investigated under different field conditions.The test fields with different ecological conditions were located at Sijie(S),Dayingjie(D) and Xiaojie(X) in Yuxi City of Yunnan province,respectively.The tobacco planted in D showed best morphological characters.However,the tobacco in S showed worst morphological characters.Flavonoid content,chlorophyll content and ratio of chlorophyll a/b had no significant difference among the three planting sites.Content both of carotenoid and soluble protein was the highest,while ratio of chlorophyll/carotenoid was the lowest in tobacco at S.The order of Pnmax,LCP and LSP was test S>test D>test X.When PAR ranging from 800 μmol·m-2·s-1 to 1000 μmol·m-2·s-1,the order of Ci,Gs and Tr was test D>test X>test S,and the order of WUE was test S>test X>test D.In addition,to ascertain the effects of ecological factors on morphological and physiological features of tobacco in different sites,the values of gray association degrees were calculated.The results show that the main ecological factors which influencing stem length,leaf area and contents of flavonoid,MDA and chlorophyll in K326 were light intensity,temperature,precipitation,UV-B radiation and illumination time,while content of alkali-hydrolyzable nitrogen in planted soil was regarded as the major influencing factor on carotenoid soluble protein and rate of Pnmax in K326.