摘要
在开顶式生长箱(OTCs)内,以津美3号黄瓜为试验材料,采用在营养液中添加硒肥的水培方式,研究增施CO2对不同施硒水平下黄瓜生长发育的影响及黄瓜对硒的吸收、累积与分配的影响。结果表明,无论是否增施CO2,随着营养液中施硒量的增加,黄瓜产量均呈现出先增加后降低的趋势,植株各部位的硒含量及硒累积量较未施硒对照显著提高,且均表现为根>茎>果实>叶片,增施CO2处理的黄瓜果实的硒转移系数随着施硒量的增加呈上升趋势。在相同硒水平下,增施CO2整体上能提高黄瓜株高、净光合速率及产量,但对果实硒含量、硒累积量和硒转移系数基本无显著影响。CO2与硒的交互作用还提高了黄瓜果实硒累积量占单株植株硒累积量的比例。当施硒量为0.125 mg/L、CO2浓度为1200μmol/mol时,黄瓜产量达到峰值,与对照(未施硒且不增施CO2)相比增幅达45.1%,黄瓜果实硒含量、硒累积量较对照(未施硒且不增施CO2)显著增加,且硒含量在安全食用范围内。
In the open-top chambers(OTCs),Jinmei No.3 cucumber was used as the experimental material,hydroponic culture method under different atmospheric CO2 concentrations and selenium(Se)application levels was adopted to investigate the growth of cucumber and the uptake,accumulation and distribution of Se.The results showed that the yield of cucumber increased first and then decreased with the increase of Se application in nutrient solution,the Se content and Se accumulation in all parts of the plant were significantly higher than those in the control,and the Se content followed the order of root>stem>fruit>leaf.The Se transfer coefficient of cucumber fruit increased with the increase of Se application rate under elevated CO2 condition.At the same selenium level,increasing CO2 improved plant height,net photosynthetic rate and yield of cucumber,but had no significant effect on Se content,Se accumulation and Se transfer coefficient of cucumber fruits.In addition,the interaction of CO2 and Se also increased the proportion of Se accumulation in fruit to that in the whole plant.When the Se mass concentration was 0.125 mg/L and CO2 concentration was 1200μmol/mol,the cucumber yield increased by 45.1%compared with the control group,and reached the peak value.Moreover,the Se content and Se accumulation in fruits increased significantly compared with the control,and the Se content was within the safe edible range.
作者
陈佳佳
李汛
吴沿友
段增强
CHEN Jia-jia;LI Xun;WU Yan-you;DUAN Zeng-qiang(School of Agricultural Equipment Engineering,Jiangsu University,Zhenjiang 212013,China;Institute of Soil Science,Chinese Academy of Sciences,Nanjing 210008,China)
出处
《江苏农业学报》
CSCD
北大核心
2020年第6期1503-1511,共9页
Jiangsu Journal of Agricultural Sciences
基金
广西科技重大专项(桂科AA17202026-5)
国家自然科学基金项目(41877103)。
关键词
硒
增施CO2
黄瓜
转移系数
selenium
elevated CO2
cucumber
transfer coefficient
