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采用盆栽试验,研究了不同保水剂用量对烟草生长指标、叶绿素含量、光合特性和叶绿素荧光参数的影响。结果表明:适量保水剂的施用显著提高了烟草各生长指标、叶绿素a、叶绿素b和总叶绿素的含量;随保水剂用量的增加,各处理烟叶的净光合速率(Pn)、蒸腾速率(Tr)、气孔导度(Gs)和水分利用率(WUE)都呈先上升后下降的趋势,说明保水剂对烟草光合特性影响较大,可以明显提高烟草光合能力,但用量过大时不利于改善烟草光合特性;各处理烟草叶片叶绿素荧光参数Fv/Fm、ΦPSII和q P均表现为先上升后略下降,而NPQ则呈下降趋势。所有处理中以T2(3 g/株)效果最好,其烟株光合能力最强,同时具有较好的自我保护调节能力。
Pot experiments were conducted to study the effects of different super absorbent polymers on tobacco growth index, chlorophyll content, photosynthetic characteristics and chlorophyll fluorescence parameters. The results showed that: Appropriate amount of super absorbent polymer significantly increased the growth index of tobacco, chlorophyll a, chlorophyll b and total chlorophyll content; With the increase of water retention agent, the net photosynthetic rate (Pn), transpiration rate (Tr) , Stomatal conductance (Gs) and water use efficiency (WUE) all increased first and then decreased, indicating that SAP had a significant effect on photosynthetic characteristics of tobacco and significantly increased photosynthetic capacity of tobacco, but it was unfavorable for improving tobacco photosynthesis Photosynthetic characteristics; The leaf chlorophyll fluorescence parameters Fv / Fm, ΦPSII and q P of all treatments showed a slight increase at first and then a slight decrease at NPQ. T2 (3 g / plant) had the best effect in all the treatments, and its photosynthesis ability was the strongest in tobacco plants, meanwhile it had better self-protection and regulation ability.