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[Objectives] To study responses of Houttuynia cordata Thunb. to tetracycline (TC) stress in a sterile environment. [Methods] Aseptic H. cordata seedlings were cultured in the medium which added the different concentrations of TC, and then the contents of chlorophyll and malondialdehyde (MDA), and activity of catalase (CAT), peroxidase (POD) and superoxide dismutase (SOD) of H. cordata leaves were measured. [Results] Compared with the CK, the contents of chlorophyll of H. cordata leaves decreased, and the accumulation of MDA, and the activity of CAT, POD and SOD in H. cordata leaves increased when H. cordata was stressed by different concentration of TC. [Conclusions] The growth, metabolism and physiology of H. cordata were affected by the stress of TC. More importantly, this proved an insight into the effect or harm of undegraded antibiotics in the soil and water in the natural environment to plant growth all the time. [ABSTRACT FROM AUTHOR]

[Objectives] To understand the content changes of fatty acid compositions and seedling growths during seed germinations of Cassia obtusifolia L. [Methods] The fatty acid compositions of germinations and seedling growths of C. obtusifolia seeds treated with different concentrations of gibberellin（GA3） and naphthalene acetic acid（NAA） were analyzed using gas chromatograph-mass spectrometer（GC-MS）, and the germination rates, root lengths, plant heights and fresh weights of their seedlings were analyzed. [Results] The contents of eicosenoic acid, α-linoleic acid, arachidic acid, eicosadienoic acid and eicosapentaenoic acid of C. obtusifolia seeds treated with different concentrations of GA3 and NAA decreased with germination time. There were significant differences between the ratios of germinations of C. obtusifolia seeds treated with different concentrations of GA3 and NAA. GA3 and NAA of different ratio treatments could promote seedling heights and fresh weights of C.obtusifolia, but increases of seedling heights and fresh weights were different. Eicosenoic acid, α-linoleic acid, arachidic acid, eicosadienoic acid and eicosapentaenoic acid were remarkably negative correlation with seedling heights and fresh weights. [Conclusions] The fatty acid components of C. obtusifolia seed germination and growth of their seedlings were affected. It indicated that GA3 and NAA treatments can affect fatty acid metabolism, the germination rates, root lengths, plant heights and fresh weights of C. obtusifolia. It is intended to provide a theoretical basis and technological reference for standardized cultivated techniques of C. obtusifolia. [ABSTRACT FROM AUTHOR]