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采用土培盆栽实验,以烤烟品种‘中烟100’和‘豫烟10’为供试材料,研究了烟叶发育过程中3种类型钙盐对两种基因型烤烟光合生理指标、叶绿素荧光参数、水分利用效率及干物质积累的影响。结果表明:‘中烟100’的光补偿点(LCP)较低、光饱和点(LSP)较高,对不同光环境的适应性较强,光合潜力较大。外源钙盐增加了两种基因型烤烟的LSP,加速了烟株生长。两种烤烟的表观量子效率(AQY)均以Ca(NO3)2处理最高,外源钙盐有助于烟株群体及个体光合能力的提高,钙盐处理的净光合速率(P n)和最大净光合速率(A max)高于对照。喷施钙盐后烟株的光化学淬灭系数(q P)、PSII最大光化学效率(F v/F m)、PSII实际光化学效率(ФPSII)和电子传递速率(ETR)升高,初始荧光(F o)及非光化学淬灭系数(NPQ)降低,表明外源钙盐不仅能够提高烟株的光化学反应效率,还能减轻光抑制。两种基因型烤烟的水分利用效率(WUE)在移栽75 d前均以Ca(Ac)2处理最高。外源钙盐提高了两种基因型烤烟的光能利用效率及光合生产能力,进而促使烟株的光合碳同化产物积累量增加。
Soil culture pot experiments were conducted to investigate the effects of three types of calcium salts on the photosynthetic characteristics, chlorophyll fluorescence parameters, chlorophyll fluorescence parameters and chlorophyll fluorescence parameters of two tobacco cultivars (Zhongyan 100 and Yuanyu 10) Water use efficiency and dry matter accumulation. The results showed that: ’China Tobacco 100’ had a lower light compensation point (LCP) and a higher light saturation point (LSP), stronger adaptability to different light environments and greater photosynthetic potential. Exogenous calcium salt increased the LSP of both genotypes of flue-cured tobacco and accelerated the growth of tobacco plants. The apparent quantum yield (AQY) of two flue-cured tobacco leaves was the highest with Ca (NO3) 2 treatment. The exogenous calcium salt could enhance the photosynthetic capacity of tobacco plants and individuals, the net photosynthetic rate (P n) The maximum net photosynthetic rate (A max) was higher than the control. The photochemical quenching coefficient (q P), PS Ⅱ maximum photochemical efficiency (F v / F m), PSII actual photochemical efficiency (ФPSII) and electron transport rate (ETR) increased after spraying calcium salts. The initial fluorescence o) and non-photochemical quenching coefficient (NPQ) decreased, indicating that exogenous calcium salt can not only improve the photochemical reaction efficiency of tobacco plants, but also reduce the light inhibition. The water use efficiency (WUE) of two genotypes of flue-cured tobacco was the highest with Ca (Ac) 2 treatment 75 days before transplanting. Exogenous calcium salt increased light use efficiency and photosynthetic productivity of two genotypes of flue-cured tobacco, which in turn led to the accumulation of photosynthetic carbon assimilation products of tobacco plants increased.