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Objective::To study the effect of different nitrogen application rates on the growth and carbon metabolism of Acanthopanax senticosus seedlings, and screen out the rational fertilization conditions, in order to provide basis and guidance for scientific fertilization of artificially cultivated A. senticosus. Method::A single-point, single-factor field experiment was conducted to study the seedlings of growing evenly A. senticosus.Five different nitrogen application treatment groups were set up to treat the seedlings, namely N1 group (30 g·m-2), N2 group (60 g·m-2), N3 group (90 g·m-2), N4 group (120 g·m-2), N5 group (150 g·m-2) and CK group (0 g·m-2), respectively.Three months later, plant height, root circumference, stem circumference, root-shoot ratio and SPAD were measured at harvest time.The contents of protein, sucrose, starch, soluble sugar and reducing sugar in fresh leaves were measured. Result::N3 treatment was the best treatment method for the growth and development of A. senticosus seedlings, and the growth of A. senticosus seedlings was the best under this treatment.The protein content of A. senticosus seedlings in N3 treatment was the highest.Starch and sucrose were best accumulated in N5 treatment group and CK treatment group.N5 treatment had the highest soluble sugar content and reducing sugar content. Conclusion::There is a dose-effect relationship between the growth and development of A. senticosus seedlings; that is to say, low and high nitrogen application treatments will cause stress on A. senticosus seedlings.In conclusion, the suitable nitrogen application rate for A. senticosus growth is 90-120 g·m-2.
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Objective::To study the effect of different N application rates on the growth and development of Acanthopanax senticosus and the changes of antioxidant enzyme activity, and screen out the suitable amount of nitrogen fertilizer for its growth and development, in order to provide scientific evidence for rational fertilization of Acanthopanax senticosus in artificial cultivation. Method::By single-point, single-factor field experiment, the study samples were one-year-old seedlings of growing evenly A. senticosus.Five nitrogen application treatment groups were set up in the fields.They were N1 (30 g·m-2), N2 (60 g·m-2), N3 (90 g·m-2), N4 (120 g·m-2), N5 (150 g·m-2) and CK (0 g·m-2) in the control group.Three months later, the raw weight of plant, root, leaf and stem were measured at harvest time.After drying to constant weight, plant dry weight, stem dry weight, leaf dry weight and root dry weight were measured.Fresh leaves of plants were collected to measure malondialdehyde(MDA) content and activities of catalase(CAT), superoxide dismutase(SOD), peroxidase(POD), acid phosphatase(ACP) and aseorbateperoxidase(APX) after harvesting seedlings. Result::The biomass of A. senticosus in group N4 (120 g·m-2) was the highest, the protein content in group N3 (90 g·m-2) was the highest, and the activity of all antioxidant enzymes in group N3 (90 g·m-2) was the lowest. Conclusion::There is a dose-effect relationship between seedlings and the nitrogen application rate.That is to say, low nitrogen application rate and high nitrogen application rate will cause stress on Acanthopanax senticosus, and the activity of antioxidant enzymes under low nitrogen application rate is higher than that under high nitrogen application rate.
RESUMO
Objective::To study the effect of plant-soil feedback on the antioxidant enzyme system of Acanthopanax senticosus seedlings, in order to elucidate the changes of plant-soil feedback on the antioxidant enzyme system of A. senticosus seedlings, and provide theoretical basis for revealing the reasons of plant-soil feedback. Method::Through the greenhouse pot experiment, plant height, leaf color value (SPAD), antioxidant enzymes [protein, superoxide dismutase(SOD), catalase(CAT), peroxidase(POD), aseorbateperoxidase(APX), malondialdehyde(MDA)] and yield and growth related indexes of soil without A. senticosus (group 1), soil with A. senticosus (group 2) for three consecutive years and soil with A. senticosus (group 3) for many years were measured respectively. Result::There were significant differences in plant height, SPAD, protein, SOD, CAT, POD, APX and MDA between seedlings of A. senticosus planted for three consecutive years (group 1), two successive years (group 2) and three successive years (group 3). The biomass, MDA, CAT, POD and SOD of A. senticosus seedlings in the soil without A. senticosus (group 1) were higher than those in the soil with A. senticosus (group 2 and 3), while the protein and APX were lower than those in the soil with A. senticosus (group 2 and 3). Conclusion::Plant and soil shows negative feedback regulation during the growth of A. senticosus seedlings, which reduced the activity of antioxidant enzymes. Therefore, the soil without planting A. senticosus has more advantages for the growth of A. senticosus seedlings. The results provide a basis for explaining the effect of plant-soil feedback on the growth of A. senticosus, and a theoretical basis and technical support for the technical standards of A. senticosus cultivation in farmland.
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Objective::To investigate the effects of plant-soil feedback on secondary metabolites in roots, stems and leaves of Acanthopanax senticosus seedlings. Method::One-year-old seedlings of A. senticosus were planted in the soil where no A. senticosus had been planted before (group 1), soil where A. senticosus had been planted for 3 years (group 2), and soil where A. senticosus had been planted for many years in the greenhouse pot experiment, and the secondary metabolites of its roots, stems and leaves were then analyzed. Result::L-Phenylalanine, 3, 4-dihydroxybenzoic acid, syringin, chlorogenic acid, caffeic acid, eleutheroside E, isofraxidin, rutin, hyperoside, and quercetin had significant differences in leaves and roots of A. senticosus seedlings in the soil of group 3, but there was no significant difference in chlorogenic acid and eleutheroside E in stem. Eleutheroside E, isofraxidin, rutin and hyperoside were not detected in the leaves of seedlings planted in group 3.Most of the secondary metabolites in the roots of A. senticosus seedlings showed positive feedback, while in the stems of Acanthopanax senticosus seedlings, caffeine, A. senticosus glycosides, hypericin and quercetin showed negative feedback, and most of the secondary metabolites in the leaves of A. senticosus seedlings showed positive feedback. Conclusion::The plant and soil showed different feedback in different parts of the growth process of A. senticosus seedlings, and the soil where A. senticosus had not been planted was more advantageous to the secondary metabolites of A. senticosus seedlings. The results of the study provide a basis for the study of the effect of plant-soil feedback on the A. senticosus, and provide the theoretical basis and technical support for the artificial cultivation of A. senticosus.