烟草科技2018，Vol.51Issue(5)：8-14,7.
盆栽试验中外源NO对干旱胁迫下烤烟光合日变化和营养元素含量的影响
Effects of exogenous NO on diurnal variation of photosynthesis and nutrition elements of drought-stressed flue-cured tobacco in pot experiment
摘要
Abstract
To reveal the mechanism of nitric oxide (NO) on drought tolerance of flue-cured tobacco under drought stress, a pot experiment was carried out to study the effects of sodium nitroprusside (SNP, an exogenous NO donor) on the chlorophyll content, diurnal variation of photosynthesis, photosynthetic products and nutrient element contents of flue-cured tobacco under drought stress. The results showed that under drought stress, the chlorophyll (Chl) content in flue-cured tobacco significantly decreased. The net photosynthetic rate (Pn), stomatal conductance (Gs) and transpiration rate (Tr) was reduced, while the intercellular CO2 concentration (Ci) increased with apparent midday depression of photosynthesis. Simultaneously, the contents of soluble sugar, sucrose,N,and K significantly increased, and the contents of starch, P, Ca, Mg, Fe and Mn significantly reduced. In addition, the contents of B, Zn and Cu were changed slightly. Under drought stress, the application of exogenous SNP (0.25 mmol/L) significantly increased the Chl content in flue-cured tobacco, promoted the Pn, Gs and Tr, and decreased its Ci content. The midday depression of photosynthesis suppressed. The contents of soluble sugar, P, K, Ca, Mg, Fe and Mn raised, however, the sucrose content was significantly reduced, and starch decomposition diminished. Therefore, the exogenous NO could alleviate the adverse effects of drought stress on the capacity of photosynthetic assimilation and the nutrient element absorption of flue-cured tobacco and improve its drought tolerance to a certain extent.关键词
烤烟/一氧化氮/干旱胁迫/光合日变化/营养元素Key words
Flue-cured tobacco/Nitric oxide/Drought stress/Diurnal variation of photosynthesis/Nutrient element分类
农业科技引用本文复制引用
林二阁,李春光,杨懿德,李怀奇,曾庆宾,王省伟,陈孟起,李耀光,喻保华,景延秋..盆栽试验中外源NO对干旱胁迫下烤烟光合日变化和营养元素含量的影响[J].烟草科技,2018,51(5):8-14,7.基金项目
河南省烟草公司郑州市公司应用基础研究项目资助"干旱逆境条件下提高烟叶品质的关键农艺措施研究"(ZYKJ201502). （ZYKJ201502）
