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Position: Home > Articles > Effects of Cadmium Stress on the Photosynthetic Characteristics and Uptake of Mineral Elements in Mirabilis jalapa Northern Horticulture 2009 (5) 175-178

紫茉莉光合特性和矿质吸收对镉胁迫的响应

作  者:
陈红辉;柯世省;马必利;钟永军;周合合
单  位:
台州学院生命科学学院
关键词:
紫茉莉;生长;光合特性;矿质元素;镉胁迫
摘  要:
采用土培试验研究了不同水平镉处理下紫茉莉生长、光合作用和矿质元素吸收的相关指标。结果表明:较高浓度((25 mg/kg)镉胁迫下紫茉莉的生长受到明显抑制,紫茉莉对镉具有较高的富集能力,对镉毒性具有很强的抗性;镉胁迫下紫茉莉叶片净光合速率和气孔导度均明显减小,但胞间CO2浓度和最大光化学效率的变化不明显,矿质元素Fe、K和Mg含量均明显降低。
译  名:
Effects of Cadmium Stress on the Photosynthetic Characteristics and Uptake of Mineral Elements in Mirabilis jalapa
作  者:
CHEN Hong-hui,KE Shi-sheng,MA Bi-li,ZHONG Yong-jun,ZHOU He-he(School of Life Science,Taizhou University,Linhai,Zhejiang 317000,China)
关键词:
Mirabilis jalapa;Growth;Photosynthetic characteristics;Mineral element;Cadmium stress
摘  要:
Mirabilis jalapa seedlings were subjected to different cadmium(Cd) levels in soils for twenty days.The parameters of growth,photosynthesis and mineral elements contents were investigated.Mirabilis jalapa plants exhibited a higher Cd-enrichment capacity and stronger Cd-tolerance,however the growth were restrained by excess Cd(>25 mg/kg).Net photosynthetic rate(P_n) and stomatal conductance(C_s) in the leaves of Mirabilis jalapa seedlings treated with 25~200 mg Cd /kg were similarly reduced.None of the investigated Cd levels decreased internal CO_2 concentration(C_i).The effect of Cd on the photochemistry efficiency(F_v/F_m) of photosystem Ⅱ was negligible but 200 mg/kg Cd treatment.Moreover,decreased in contents of mineral elements including Fe,K and Mg were observed in the leaves of Cd-treated plants.

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