摘要
运用光合作用测定系统,对野生秦艽(Gentiana macrophylla Pall．)和小秦艽(G．dahurica Fisch．)的开花期的光合特性进行研究。结果表明,2种秦艽的净光合速率、蒸腾速率、气孔导度日变化曲线都呈双峰型,有明显的光合“午休”现象。小秦艽的光合速率、蒸腾速率、气孔导度照著高于秦艽,分别高出2．7 μmolCO2·m-2·s-1、1．5 mmol·m-2·s-1和140．7 mmol．m-2·s-1而叶温则低于秦艽2．8C。相关分析表明,开花期的温度、光照对2种秦艽的光合都有一定影响,蒸腾速率、气孔导度调节光合作用,而引起2种秦艽光合速率降低的主要因素为非气孔因素。
A portable photosynthesis system was used to study the photosynthetic characteristics of Gentiana macrophylla Pall. and G. dahurica Fisch. at the flowering stage. The results indicated that the in the two plants,the net photosynthetic rates,transpiration rates and stomatal conductance varied in a doublepeak curve and presented a clear ＂midday depression＂. The net photosynthetic rates,transpiration rates and stomatal conductance in G. dahurica Fisch. were significantly higher that those in G. macrophylla Pall. by 2.7μmol CO2 ·m^-2·s^-1,1.5mmol ·m^-2 · s^-1 and 140.7mmol · m^-2 ·s^-1 respectively, but the leaf temperature of G. dahurica Fisch. was 2.8 C higher than that of G. dahurica Fisch. Related analysis showed that the temperature and sunshine exerted influence on the photosynthesis of two plants at the flowering stage to some extent and the transpiration rates and stomatal conductance regulated the photosynthesis, whereas the decreased photosynthetic rates in the two plants resulted from non-stomatal factors.
出处
《西北植物学报》
CAS
CSCD
北大核心
2006年第4期836-841,共6页
Acta Botanica Boreali-Occidentalia Sinica
基金
国家教育部科学技术研究重点项目(204152)国家科技部西部专项(2005BA901A18)
关键词
野生
秦艽
小秦艽
光合特性
wild
Gentiana macrophylla Pall.
G. dahurica Fisch.
photosynthetic characteristic
