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。
Mirabilis jalapa seedlings were subjected to differem 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,,） and stomatal conductance （C,） in the leaves of Mirabilisjalapa seedlings treated with 25-200 mg Cd/kg were similarly reduced. None of the investigated Cd levels decreased internal CO2 concentration （Ci）. The effect of Cd on the photochemistry efficiency （Fv/Fm） 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.
出处
《北方园艺》
CAS
北大核心
2009年第5期175-178,共4页
Northern Horticulture
基金
浙江省自然科学基金资助项目(Y504256)
浙江省新苗人才计划资助项目(2007R40G2170047)
关键词
紫茉莉
生长
光合特性
矿质元素
镉胁迫
Mirabilis jalapa
Growth
Photosynthetic characteristics
Mineral element
Cadmium stress
