遮阴对濒危药用植物毛黄堇叶片生理特性的影响

Effects of Shading on Physiological Characteristics of Leaves of Endangered Medicinal Plant Corydalis tomentella

目的:找到合理有效的光照条件,为毛黄堇人工种植提供参考。方法:以1年生毛黄堇为试验材料,设置自然光(CK)和25%、50%、75%遮阴4个处理,通过测定和分析不同处理条件下毛黄堇叶片生理特征、光合特征、叶片形态结构等指标,探讨遮阴对毛黄堇生长和光合作用产生的影响。结果:25%遮阴处理可显著提高毛黄堇的净光合速率(P<0.05),75%遮阴处理则起抑制作用;遮阴对毛黄堇光合色素含量有显著影响,光合色素含量均随遮阴度增加呈先升高后降低的趋势,在50%遮阴处理条件下达到最大值,而在全光照下含量最低;25%遮阴处理可显著增加毛黄堇叶片宽度、羽片宽及叶面积(P<0.05);药材单株产量以25%遮阴处理最高,较对照组增产56.34%。结论:毛黄堇具有一定的耐阴性,在25%遮阴的条件下生长较好,遮阴过度或无遮阴均会抑制该植物的生长。

Objective:The reasonable and effective light conditions will found to provide theoretical reference for rational planting of Corydalis tomentella.Method:One-year-old C.tomentella was used as the test material,artificial shading was used,and four shading treatments were studied,including natural light(CK),25%shading,50%shading and 75%shading.By measuring and analyzing the physiological characteristics,photosynthetic characteristics and leaf morphological structure of the leaves of C.tomentella under different shading conditions,to explore the effect of shading on its growth and photosynthetic physiology.Results:25%shading treatment could significantly improve the net photosynthetic rate of C.tomentella(P<0.05),and 76%shading treatment would inhibit.Shading had a significant effect on the photosynthetic pigment content of C.tomentella.The light and pigment content increased first and then decreased with the increase of shading degree,reaching the maximum under 50%shading treatment conditions,and the value of the above indicators is the smallest in full illumination.25%of the relative shading treatment significantly increased the leaf width,feather width and leaf area of C.tomentella(P<0.05).The yield per plant of the medicinal materials was the highest with 25%shading,and 56.34%higher than the CK treatment.Conclusion:C.tomentella has a certain shade tolerance.It grows well under 25%shading.Over shading or no shading can inhibit the growth of the plant.