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摘要: 以4个美国紫菀Aster novae-angliae 品种1年生扦插苗为研究对象,研究了美国紫菀的光合生理特性。结果表明:4个美国紫菀品种的光补偿点与光饱和点各不相同,但光适应能力均较强。4个品种的光适应能力为紫球Purple Dome>香叶Herbstschnee>粉花Barrs Pink>安德Andenken an Alma Potschke;表观量子效率为香叶>安德>紫球>粉花;暗呼吸速率为安德>紫球>香叶>粉花。在春秋两季4个品种净光合速率日变化曲线均表现为单峰型,在夏季均为双峰型,春季峰值出现时间明显比夏、秋两季提前,夏季第1峰值均大于第2峰值,且有明显的光合午休现象。多元逐步回归分析表明,影响净光合速率的关键环境因子随花卉品种和生长季节不同而变化,主要包括光合有效辐射、空气温度及叶面温度。图3表3参21Abstract: One-year-old cuttings of four cultivars of Aster novae-angliae,Purple Dome,Herbstschnee,Barrs Pink,and Andenken an Alma Potschke,were studied to determine their photosynthetic physio-ecological characteristics using a multivariate stepwise regression analysis. Results indicated that the light adaptive capacity was high and in the order:Purple Dome > Herbstschnee>Barrs Pink>Andenken an Alma Potschke with light compensation and saturation points differing. For apparent quantum yield,the order was:Herbstschnee > Andenken an Alma Potschke>Purple Dome >Barrs Pink;and for the dark respiration rate it was:Andenken an Alma Potschke>Purple Dome>Herbstschnee>Barrs Pink. These four cultivars had strong diurnal changes in the net photosynthetic rate with single-peaked curves at midday in spring and autumn,but double-peaked curves in summer. These peak net photosynthetic rates were earlier in spring than in summer or winter. Double-peaked curves had greater initial peaks,and the photosynthetic noon break was strong at midday in summer(midday depression of photosynthesis). A multivariate stepwise regression showed that the key environmental factors influencing the net photosynthetic rate included photosynthetically active radiation(PAR),air temperature,and leaf temperature;however,these differed for each cultivar.[Ch,3 fig. 3 tab. 21 ref.]
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https://zlxb.zafu.edu.cn/article/doi/10.11833/j.issn.2095-0756.2010.06.010
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