Physiological and enrichment characteristics of Paulownia fortunei seedlings under zinc, cadmium and their combined stress / 生物工程学报

The hydroponic culture test method was used to study the physiological and biochemical responses of Paulownia fortunei seedlings under Zn stress, Cd stress, and combined Zn and Cd stress as well as changes in the enrichment and transfer characteristics of heavy metals. Under single and combined heavy metal stress, the biomass, plant height, and peroxidase (POD) activity of P. fortunei decreased as the treatment concentration increased. Combined Zn and Cd affected adversely plant height and biomass. As the concentration of Zn increased when applied alone, the chlorophyll content and catalase (CAT) activity of P. fortunei first increased and then decreased, the superoxide dismutase (SOD) activity increased, and the aboveground malondialdehyde (MDA) content first decreased and then increased. As the concentration of Cd increased when applied alone, chlorophyll content and CAT activity increased, and SOD activity and aboveground MDA content first increased and then decreased. Under both Cd and Zn, the physiological response was more complex. Cd in the seedlings of P. fortunei was concentrated in the root. In contrast, Zn was concentrated in the upper part of the ground, and its transfer coefficient was greater than 1.00. Thus, the addition of Zn promotes the transfer of heavy metals to the above-ground portions of plants. Generally, P. fortunei can effectively promote ecological restoration under complex forms of heavy metal pollution.

Chemical Constituents in Flowers of Paulownia fortunei(Seem.) Hemsl / 中国药学杂志

OBJECTIVE: To investigate the chemical constituents in flowers of Paulownia fortunei (Seem.) Hemsl. METHODS: The flowers of Paulownia fortunei (Seem.) Hemsl. Were extracted with 50% aqueous acetone by tissue disruption extraction. The compounds were isolated and purified by Diaion HP-20, Toyopearl HW-40, Sephadex LH-20, MCI Gel CHP-20, silica gel column chromatography and preparative HPLC, and their structures were elucidated on the basis of spectral data and physiochemical properties. RESULTS: Nineteen compounds were elucidated as 2-(3-methoxy-4-hydroxyphenyl)-propane-1,3-diol(1), 1-phenylpropane-1,2,3-triol(2), 3,4-dihydroxy-β-methoxyphenethy alcohol(3), chryseriol(4), phenylpropanoid(5), apigenin(6), luteolin(7), 4-hydroxy-3-methoxybenzoic acid(8), 2-(4-hydroxyphenyl) ethanol(9), 3,4-dihydroxyphenylethyl alcohol(10), vanillic acid(11), 3-(4-hydroxy-3,5-dimethoxyphenyl) propane-1,2-diol(12), p-hydroxybenzoic acid(13), astragalin(14), nicotinic acid(15), thymidine(16), thymine(17), 5-(4′-hydroxybenzyl) hydantoin(18) and 1-(3-indolyl)-2,3-dihydroxypropan-1-one(19). CONCLUSION: Compounds 1-3, 5, 8-10, 12, 14-19 are isolated from this plant for the first time.

Salinity effects on protein content, lipid peroxidation, pigments, and proline in Paulownia imperialis (Siebold & Zuccarini) and Paulownia fortunei (Seemann & Hemsley) grown in vitro

We evaluated the effects of saline stress on soluble proteins, lipid peroxidation (TBAR), chlorophyll a, chlorophyll b, beta-carotene, violaxanthin, and proline in Paulownia imperialis and Paulownia fortunei plants grown in vitro. When the propagated plants reached a determined size, they were transferred aseptically to WPM culture medium containing different sodium chloride concentrations (0, 20, 40, 60, 80, and 160 mM) and were sampled at 15 and 30 days. Proline content was determined at 30 days after transfer only. Protein concentration significantly decreased with the highest salt levels in P. imperialis compared to controls in which no sodium chloride was added. In both P. imperialis and P. fortunei, lipid peroxidation significantly increased at 15 days but decreased at 30 days. Chlorophyll a, chlorophyll b, beta-carotene, and violaxanthin significantly decreased with exposure to higher sodium chloride concentrations at 15 and 30 days in both species. Proline content in P. imperialis significantly increased in plants grown in 20 and 40 mM of sodium chloride and decreased in higher sodium chloride concentrations. In P. fortunei, this measure significantly decreased proline content at all salt concentrations in plants exposed to all levels of sodium chloride compared to controls. Our results show that P. imperialis is more tolerant to salt stress at the salinity conditions tested.