摘要
为研究三色堇花期光合生理生态特性,以4个品种229-18、EP1、ZMY2-1、08-H2为对象,利用Li-6400便携式光合作用系统,对其花期叶片光合生理生态特征及其影响因子进行研究。结果表明:在华北地区的5月中旬,三色堇叶片净光合速率(Pn)的日变化呈双峰曲线,最高峰出现在10:00,中午时段出现"午休"现象;在导致光合"午休"的因素中,强光引起的光饱和现象及中午高温为主要原因,各生态因子间存在显著相关性;在叶片Pn影响因子中,蒸腾速率(Tr)和光合有效辐射(PAR)对其呈显著直接正效应;08-H2具有较高的光饱和点(LSP)和表观量子效率,其光合日变化中Pn、Tr和光能利用率(SUE)都显著高于其他品种,显示出花期较高的光合能力和需水特点。
Taking 4 cuhivars of Viola tricolor, i. e. , 229 - 18, EP1 , ZMyz - 1 and 08 - H2 as study objects, the characteristics of photosynthetic physiology and ecology of the plants during florescence stage and the relevant influencing factors were studied with Li - 6400 portable photosynthesis tester in north of Henan Province in May. The results showed that the diurnal variation of net photosynthesis rate of V. tricolor leaves showed two peak curves in May, the highest peak occurred at 10：00 am, indicating a ＇nap＇ phenomenon. The light satura- tion caused by strong sunshine and the followed high temperature at noon time were the important ecological factors leading to the photosynthetic ＇ nap＇ of V. tricolor plants. There were significant correlations among the relevant ecological factors. The major physiological factors that affected the diurnal P,1 variation were transpiration rate （Tr） and photosynthetic available radiation （PAR） , there was a significant positive correlation between Tr and PAR. The cultivar 08 - H2 showed higher level of light saturation point （LSP） and photosynthetic quantum effi- ciencies, whose Pn, Tr and sunlight use efficiency （SUE） were all significantly higher than those of other cuhivars, indicating that this cultivar had higher photosynthetic capability and water-demand characteristics.
出处
《西南林学院学报》
2011年第3期7-12,共6页
Journal of Southwest Forestry College
基金
河南科技学院博士启动金(7027)资助
关键词
三色堇
净光合速率
光饱和
光能利用率
Viola tricolor
net photosynthesis rate
light saturation point
light use efficiency
