摘要
为了研究不同浓度镉胁迫对不同薄皮甜瓜品种幼苗生长和生理特性的影响,在前期试验的基础上,采用水培方法,以薄皮甜瓜品种X-T-G(相对高积累品种)和IVF-28(相对低积累品种)为材料,通过设置0,30,60,100 mg/L 4种不同镉浓度,研究不同镉胁迫浓度下X-T-G和IVF-28薄皮甜瓜品种地上部、根系生长和生理生化指标的变化。结果表明:X-T-G和IVF-28的株高、茎粗、总根长、根表面积、根体积、根尖数、分形维数均随镉胁迫处理的浓度增加而减小,其中X-T-G降幅与IVF-28相比较低。随着镉胁迫处理浓度的增加,2个供试的薄皮甜瓜品种的生理也发生了改变,其中SOD、MDA和H2O2含量均随镉胁迫处理浓度的升高而增大,POD活性和GSH含量在60 mg/L CdCl2处理时达到最大,而CAT活性和PRO含量在30 mg/L CdCl2处理时达到最大,其中X-T-G的生理生化指标高于IVF-28。综上可知,薄皮甜瓜品种X-T-G幼苗在镉胁迫下,幼苗对镉胁迫的耐受性高于IVF-28。
In order to study the effects of different concentrations of cadmium stress on the growth and physiological characteristics of different thin-skinned melon varieties at seedling stage,hydroponic methods were conducted with based on previous experiments,and the thin-skinned melon varieties XTG(relatively high accumulation species)and IVF-28(relatively low accumulation species)were selected as trial cultivars.Four different CdCl2 concentrations of 0,30,60,and 100 mg/L were set,the changes of shoot growth,root growth and physiological and biochemical indexes under different Cd stress concentrations were studied.The results showed that the plant height,stem thickness,total root length,root surface area,root volume,root tip number,and fractal dimension of XTG and IVF-28 all decreased as the concentration of Cd stress increased.And the decrease of XTG was lower than that of IVF-28.With the increase of Cd stress treatment concentration,the physiology of the two tested thin-skinned melon varieties also changed.The SOD,MDA and H2O2 contents increased with the increase of Cd stress treatment concentration,and the POD activity and GSH content reached the maximum under 60 mg/L CdCl2 treatment,while CAT activity and PRO content reached the maximum when 30 mg/L CdCl2 treatment,in which the physiological and biochemical indicators of XTG were higher than IVF-28.The results showed that X-T-G,a thin-skinned melon variety,had a lower decline in growth-related indicators than IVF-28 under Cd stress,and physiological indicators were higher than IVF-28,indicating that X-T-G had high tolerance to Cd stress than IVF-28.
作者
王志伟
李涵
梁少华
楚箫
孙小武
WANG Zhiwei;LI Han;LIANG Shaohua;CHU Xiao;SUN Xiaowu(Horticulture College,Hunan Agricultural University,Changsha 410128,China;Hunan Vegetable Research Institute,Changsha 410125,China;Hunan Crop Research Institute,Changsha 410125,China)
出处
《华北农学报》
CSCD
北大核心
2020年第1期81-88,共8页
Acta Agriculturae Boreali-Sinica
基金
国家西甜瓜产业技术体系(CARS-25)
湖南省重点研发项目(2017NK2153)
关键词
薄皮甜瓜
镉
幼苗
生长
生理
Oriental melon
Cadmium
Seedling
Growth
Physiological
