摘要
【目的】分析2种薯肉色甘薯对亚硒酸盐的吸收累积效应,为探索安全高效的富硒甘薯生产技术和促进广西富硒甘薯产业健康发展提供参考依据。【方法】以橘黄色薯肉的桂薯10号和紫色薯肉的桂紫薯1号为试验材料,测定盆栽土壤中不同浓度(0、0.20、0.40和0.80 mg/kg)亚硒酸盐处理[分别设为Se 0(对照)、Se 0.2、Se 0.4和Se 0.8处理]甘薯植株的农艺性状、薯块产量和品质,分析亚硒酸盐在不同薯肉色甘薯品种各器官中的累积和分配规律。【结果】施用0.20和0.40 mg/kg亚硒酸盐均可显著提高甘薯的单株鲜薯产量(P<0.05,下同);施用不同浓度亚硒酸盐对同种薯肉色甘薯植株的蔓长、分枝数和单株结薯数及薯块的可溶性糖、蛋白和胡萝卜素含量均无显著影响(P>0.05);Se 0.2、Se 0.4和Se 0.8处理桂紫薯1号的原花青素含量均低于对照,其中Se 0.8处理显著低于对照23.08%;根、茎、薯块和叶片的硒含量在植株不同生长发育时期均高于对照;2种薯肉色甘薯各器官的硒累积量和分配率排序均为薯块>根>叶>茎;薯块中的硒形态均为有机硒,未检测到四价硒和六价硒,其中,硒代胱氨酸含量占有机态硒含量的比例明显高于甲基硒代半胱氨酸含量,桂薯10号薯块的硒代胱氨酸含量占有机硒含量的比例随着外源亚硒酸盐浓度的增加而升高,而桂紫薯1号薯块的硒代胱氨酸含量占有机硒含量的比例随着外源亚硒酸盐浓度的增加而降低。【结论】桂薯10号和桂紫薯1号中的硒均为有机态的硒代胱氨酸和甲基硒代半胱氨酸,其中硒代胱氨酸含量明显高于甲基硒代半胱氨酸含量;在土壤中施用0.20和0.40 mg/kg亚硒酸盐甘薯薯块的产量较高,施用0.80 mg/kg亚硒酸盐桂薯10号薯块的硒代胱氨酸含量占有机态硒含量的比例高于桂紫薯1号,生产实践中可根据甘薯品种特性施用适宜浓度的外源硒。
【Objective】The selenite absorption and accumulation effects of two sweetpotato cultivars with different flesh colors were analyzed to provide reference for the exploration of safe and efficient selenium-rich sweetpotato production technology and the development of selenium-rich sweetpotato industry in Guangxi.【Method】With orange-flesh Guishu No.10 and purple-flesh Guizishu No.1 as experimental materials,the agronomic characters,tuber yield and quality of sweetpotato plants treated with selenite at different concentrations(0,0.20,0.40 and 0.80 mg/kg)in potted soil(Se 0,Se 0.2,Se 0.4 and Se 0.8,respectively)were determined.Furthermore,the accumulation and distribution of selenite in organs of different sweet potato cultivars with different flesh colors were analyzed.【Result】Application of 0.20 and 0.40 mg/kg selenite could significantly increase the yield of sweetpotato per plant(P<0.05,the same as below).Selenite at different concentrations had no significant effect on the vine length,branch number,number of potatoes per plant,soluble sugar content,protein content and carotene content of the same sweet potato cultivar(P>0.05).However,the content of proanthocyanidins in Guizishu No.1 treated by Se 0.2,Se 0.4 and Se 0.8 was lower than that of the control,and the content of proanthocyanidins in Se 0.8 treatment was significantly lower than that of the control by 23.08%.The selenium content of fiber root,stem,tuber root and leaf of the plant was higher than that of the control group at different growth stages.The order of selenium accumulation and distribution rate of organs of different varieties was tuber root>fiber root>leaf>stem.Organic selenium dominated the selenium morphology in the tuber root of the two kinds of sweetpotato with different flesh colors,but no tetravalent selenium and hexavalent selenium were detected.Among them,the proportion of SeCys2 in organic selenium content was significantly higher than that of SeMeCys.The ratio of SeCys2 to organic selenium content of Guishu No.10 increased with the increase of exogenous selenite concentration,while the ratio of SeCys2 to organic selenium content of Guizishu No.1 decreased with the increase of exogenous selenite concentration.【Conclusion】The selenium forms of Guishu No.10 and Guizishu No.1 were SeCys2 and SeMeCys,and the content of SeCys2 is obviously higher than that of SeMeCys.When 0.20 and 0.40 mg/kg selenite were used to the soil,the yield of tuber root was higher.Meanwhile the ratio of SeCys2 content to organic selenium content in Guishu No.10 was higher than Guizishu No.1 when applying 0.80 mg/kg selenite.In production practice,suitable concentration of exogenous selenium should be applied according to the characteristics of sweet potato varieties.
作者
李慧峰
黄咏梅
李彦青
滑金锋
廖金秀
陈天渊
LI Hui-feng;HUANG Yong-mei;LI Yan-qing;HUA Jin-feng;LIAO Jin-xiu;CHEN Tian-yuan(Institute of Maize Research,Guangxi Academy of Agricultural Sciences,Guangxi Nanning 530007,China)
出处
《西南农业学报》
CSCD
北大核心
2021年第3期566-574,共9页
Southwest China Journal of Agricultural Sciences
基金
国家自然科学基金项目(32060469)
广西自然科学基金项目(2017GXNSFAA198024)
广西创新驱动发展专项(桂科AA17202027-1)
国家现代农业产业技术体系广西创新团队建设专项(nycytxgxcxtd-03-11-3)
现代农业产业技术体系建设专项(CARS-10-C19)
广西农业科学院玉米研究所科技发展基金项目(桂玉科2017004)。
关键词
甘薯
薯肉颜色
富硒
亚硒酸盐
吸收与累积效应
Sweetpotato
Tuber flesh
Selenium-rich
Selenite
Absorption and accumulation
