高级检索

    外源褪黑素对不同品种雪茄烟生长和光合生理特性的影响

    Effects of Exogenous Melatonin on Growth and Photosynthetic Physiological Characteristics of Different Varieties of Cigar Tobacco

    • 摘要: 为探明外源褪黑素对不同品种雪茄烟生长和光合生理特性的影响,以CX80和德雪5号为试验材料,设置喷施100 μmol/L褪黑素(MT)和喷施清水(CK)两个处理,研究外源褪黑素对两个雪茄烟品种光合色素、光合气体交换参数、光合作用关键酶活性、根系构型参数、干物质积累量等的影响。结果表明,外源褪黑素显著提高了两个品种雪茄烟叶片的叶绿素含量、磷酸烯醇式丙酮酸羧化酶(PEPC)和核酮糖-1,5-二磷酸羧化酶/加氧酶(Rubisco)活性,CX80和德雪5号的净光合速率(Pn)分别较对照组提高26.39%和26.19%,光能利用率(LUE)分别提高31.64%和26.43%,气孔限制值(Ls)分别降低33.70%、47.79%;两个品种雪茄烟褪黑素处理的的总根长、根系表面积、根系体积、根系平均根直径、总根尖数、株高、叶面积、比根长、根冠比均不同程度提高,并且CX80的地上部和根系生物量增加比例更高,分别较对照提高24.59%和41.89%;褪黑素与品种互作效应对地下部根长、根体积、根系表面积的影响达到显著水平。综上所述,叶面喷施外源褪黑素对雪茄烟的生长发育和光合生理特性具有显著促进作用,尤其对地下部根系的生长和构型起到正向调节的作用,因此,可以通过施用外源褪黑素提高其对环境的适应能力。

       

      Abstract: In order to explore the effects of exogenous melatonin on the growth and photosynthetic physiological characteristics of different cigar varieties in this study. CX80 and Dexue No. 5 were used as the experimental material. Two elements including variety and melatonin were conducted to study the effects of exogenous melatonin on photosynthetic pigments, photosynthetic gas exchange parameters, key enzyme activities, root architecture parameters and material accumulation of different varieties. The results showed that exogenous melatonin significantly increased the chlorophyll content, PEPC and Rubisco activity of the leaves of both varieties, and the net photosynthesis rate (Pn) of CX80 and De Xue 5 were 26.39% and 26.19% higher than the control group, respectively. Meanwhile the light energy utilization rate (LUE) was 31.64% and 26.43% higher, the stomatal limitation value (Ls) was 33.70% and 47.79% lower. The total root length, root surface area, root volume, average root diameter, total root tip number, plant height, leaf area, root-to-shoot ratio, and root crown ratio of the melatonin treatment of both varieties were increased to varying degrees. The aboveground and root biomass of CX80 increased by 24.59% and 41.89% compared with the control, respectively. The interaction effect of melatonin and variety on the underground root length, root volume, and root surface area reached a significant level. The results showed that the application of exogenous melatonin can significantly promote the growth and development, as well as photosynthetic physiological characteristics of cigars, especially the growth and configuration of the underground root system. Therefore, exogenous melatonin can be applied to improve the adaptability of cigar to the environment.

       

    /

    返回文章
    返回