光照强度对夏枯草幼苗生长及光合特性的影响

Effects of light intensity on photosynthetic characteristics and seedling growth of Prunella vulgaris

目的:以夏枯草幼苗为材料,研究不同光照强度(100%,42%,20%,10%)对其生长指标和光合特性的影响。方法:不同层数遮阳网处理夏枯草幼苗,测定相关指标,结合方差统计方法进行分析比较。结果:随着光照强度的减弱,植株茎杆变细,叶片变长,并以42%全光照条件下的株高与净生长量最大;叶绿素a,叶绿素b,叶绿素(a+b),类胡萝卜素均随光强的减弱而增加,叶绿素a/b随光强减弱而减弱;净光合速率,蒸腾速率随光强减弱而减弱,胞间CO2浓度随光强减弱而增加,气孔导度先下降在10%全光照下又升高。结论:夏枯草幼苗对不同的光照强度有不同的适应性和较高的利用率,在42%光照条件下生长最好,适度遮阴更能促进夏枯草幼苗营养生长。

Objective： To study the effect of light intensity on photosynthetic characteristics and seedling growth of Prunella vulgaris under different light intensity.Method： The seedling of P.vulgaris was shaded with shading net,and relative parameters were measured.The data was statistically processed.Result： With the reducing light intensity,the young plant stems became slender,the leaf long increased.The plant height and net growth under 42% full light condition were significantly higher than those under the other light intensity,chlorophyⅡand carotenoid contents increased,as well as Chl a/b decreased under low light.Photosynthetic indicators of Pn,Tr decreased under low light,but CO2 concentration increased,and Gs content decreases and then increased under 10% full light intensity.Conclusion： P.vulgaris manifested the different plasticity and adaptability under different light intensities.The 42% light intensity was the best and the proper shading would promote the growth of seedlings.