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研究了干旱处理15d后,大叶型丹参和小叶型丹参2个品种幼苗气体交换和叶绿素荧光参数的变化.结果表明:在干旱胁迫15d后,大叶型丹参叶片净光合速率(Pn)和PSⅡ最大光化学效率(Fv/Fm)分别下降了66.42%和10.98%,而小叶型丹参的Pn和Fv/Fm分别下降了29.32%和5.47%,干旱胁迫对大叶型丹参Pn和Fv/Fm的影响明显大于小叶型丹参.小叶型丹参Pn下降主要由气孔因素造成,而大叶型则主要由非气孔因素所致.干旱胁迫使丹参叶片的气孔导度(Gs)下降,但明显诱导了水分利用效率(WUE)、非光化学猝灭系数(qN)和光呼吸速率与净光合速率比率(Pr/Pn)的增加,以提高干旱胁迫抗性.其中小叶型丹参的增幅明显大于大叶型丹参.表明小叶型丹参的抗干旱胁迫能力更强.
The changes of gas exchange and chlorophyll fluorescence parameters of seedlings of two cultivars of large-leaf Salvia miltiorrhiza and small leaf-type Salvia miltiorrhiza were studied after 15 days of drought stress.The results showed that after 15 days of drought stress, the net photosynthetic rate (Pn) and PSⅡ The maximum photochemical efficiency (Fv / Fm) decreased by 66.42% and 10.98%, respectively, while the Pn and Fv / Fm decreased by 29.32% and 5.47%, respectively. The effect of drought stress on Pn and Fv / Fm Was significantly greater than the leaflet Salvia miltiorrhiza Pn decline mainly caused by stomatal factors, while the large leaf type is mainly caused by non-stomatal factors.Drought stress decreased stomatal conductance (Gs) of Salvia miltiorrhiza leaves, but significantly induced water use (WUE), non-photochemical quenching coefficient (qN), and the ratio of photosynthesis rate to net photosynthetic rate (Pr / Pn), in order to improve the resistance to drought stress. Salvia miltiorrhiza resistance to drought stress stronger.