Effect of CO2 enrichment on the glucosinolate contents under different nitrogen levels in bolting stem of Chinese kale (Brassica alboglabra L.).
The effects of CO(2) enrichment on the growth and glucosinolate (GS) concentrations in the bolting stem of Chinese kale (Brassica alboglabra L.) treated with three nitrogen (N) concentrations (5, 10, and 20 mmol/L) were investigated. Height, stem thickness, and dry weights of the total aerial parts, bolting stems, and roots, as well as the root to shoot ratio, significantly increased as CO(2) concentration was elevated from 350 to 800 microl/L at each N concentration. In the edible part of the bolting stem, 11 individual GSs were identified, including 7 aliphatic and 4 indolyl GSs. GS concentration was affected by the elevated CO(2) concentration, N concentration, and CO(2)xN interaction. At 5 and 10 mmol N/L, the concentrations of aliphatic GSs and total GSs significantly increased, whereas those of indolyl GSs were not affected, by elevated atmospheric CO(2). However, at 20 mmol N/L, elevated CO(2) had no significant effects on the concentrations of total GSs and total indolyl GSs, but the concentrations of total aliphatic GSs significantly increased. Moreover, the bolting stem carbon (C) content increased, whereas the N and sulfur (S) contents decreased under elevated CO(2) concentration in the three N treatments, resulting in changes in the C/N and N/S ratios. Also the C/N ratio is not a reliable predictor of change of GS concentration, while the changes in N and S contents and the N/S ratio at the elevated CO(2) concentration may influence the GS concentration in Chinese kale bolting stems. The results demonstrate that high nitrogen supply is beneficial for the growth of Chinese kale, but not for the GS concentration in bolting stems, under elevated CO(2) condition.
La
Gui-xiao
GX
Ministry of Education Key Lab of Environment Remediation and Ecological Health, College of Environmental and Natural Resources Science, Zhejiang University, Hangzhou 310029, China.
Fang
Ping
P
Teng
Yi-bo
YB
Li
Ya-juan
YJ
Lin
Xian-yong
XY
D001937:Brassica / Q000187:drug effects / Q000502:physiology*; D002245:Carbon Dioxide / Q000008:administration & dosage*; D004305:Dose-Response Relationship, Drug; D005961:Glucosinolates / Q000378:metabolism*; D009584:Nitrogen / Q000008:administration & dosage*; D018547:Plant Stems / Q000187:drug effects / Q000254:growth & development* / Q000378:metabolism*
D005961:Glucosinolates; D002245:Carbon Dioxide; D009584:Nitrogen