摘要
为了探讨银杏外种皮对生菜的化感作用,采用盆栽方法,分别设置5个外种皮施用量(0、15、30、60、90 g/盆)处理,研究银杏外种皮对生菜生长、抗氧化酶系统、渗透调节物质含量以及光合参数的影响。结果表明:随着银杏外种皮施用量的增加,生菜的主根长和地上部鲜重呈先上升后下降的趋势,而株高和茎粗则不断下降,在施用量为90 g/盆时生菜的各生长指标均达到最低值;生菜的光合色素含量随银杏外种皮施用量的增加呈下降趋势,各处理不同光合色素含量与对照相比均显著下降;生菜超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、过氧化物酶(POD)活性、游离脯氨酸含量及可溶性蛋白含量随银杏外种皮施用量的增加均先上升后下降,但丙二醛(MDA)含量并未显著增加;生菜净光合速率Pn、胞间CO_2浓度Ci和蒸腾速率Tr随银杏外种皮施用量的增加呈先上升后下降的趋势,气孔导度Gs则不断下降。综上所述,银杏外种皮对生菜产生了明显的化感作用,对生菜的生长、生理和光合指标总体呈抑制作用,并且随着施用量的增加,抑制作用不断加强。
Ginkgo biloba exocarp may have allelopathy on lettuce, a pot experiment was conducted with 5 grades of exocarp application （0, 15, 30, 60 and 90 g/pot） in order to study of the effects of Ginkgo biloba exocarp on lettuce growth, antioxidant system, contents of osmotic adjustment substances and photosynthetic system. The results showed that with the increase of lettuce exocarp application, fresh weights of lettuce root length and shoot increased firstly and then decreased, while plant height and stem diameter decreased, and the above lettuce indexes reached the minimum values under 90 g/pot treatment; with the increase of exocarp application, the contents of photosynthetic pigments were decreased significantly compared with the contrast, the activities of superoxide dismutase （SOD）, catalase （CAT） and peroxidase （POD） activity as well as the contents of free proline and soluble protein increased first and then decreased, but malondialdehyde （MDA） content increased insignificantly in lettuce; and with the increase of exocarp application, net photosynthetic rate Pn, intercellular carbon dioxide Ci and transpiration rate of Tr increased first and then decreased, stomatal conductance Gs is dwindling in lettuce. In summary, Ginkgo biloba exocarp has obvious allelopathic effects on lettuce, inhibiting lettuce growth, physiological characteristics and photosynthetic indexes, the inhibition is strengthened with the increase of exocarp application.
作者
林仁亨
黄海涛
李焕秀
姜建业
蒋伟
唐懿
LIN Renheng;HUANG Haitao;LI Huanxiu;JIANG Jianye;JIANG Wei;TANG Yi(Fruit and Vegetable Research Institute,Sichuan Agricultural University,Chengdu 610000,China;Mianyang Academy of Agricultural Sciences,Mianyang,Sichuan 621000,China;Jintang County Rural Development and Forestry Bureau,Chengdu 610000,China;College of Chemistry and Life Science,Chengdu Normal University,Chengdu 610000,China)
出处
《土壤》
CAS
CSCD
北大核心
2018年第4期732-737,共6页
Soils
关键词
银杏外种皮
化感作用
生菜
生理特性
光合特性
Ginkgo biloba exocarp
Allelopathic effect
Lettuce
Physiological property
Photosynthetic characteristics
