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Journal of Desert Research ›› 2020, Vol. 40 ›› Issue (2): 206-213.DOI: 10.7522/j.issn.1000-694X.2019.00115

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Effect of long-term consecutive cropping on leaf PSⅡ photochemical effecience and antioxidant enzyme activity of lanzhou lily

Shi Guiying1, Sun Hongqiang1, Yu Yanlin1, Zhang Lina1, Jia Xixia1, Zhang Lipeng1, Li Mouqiang2   

  1. 1. College of Horticulture, Gansu Agricultural University, Lanzhou 730070, China;
    2. Agricultural Technology Extension Station of Longmen Town, Lintao County, Lintao 730500 Gausu, China
  • Received:2019-09-26 Revised:2019-12-16 Online:2020-03-20 Published:2020-04-26

Abstract: This paper was purposed to evaluate the effect of long-term consecutive cropping on Lanzhou lily (Lilium davidii var. unicolor) plant growth and photosynthesis and antioxidant enzyme activity. 12 plant growth indexes and 18 physyological indexes were investigated in different growth stages of the lily cropped in 20 sample fields with 0, 3, 6, 9 years of replanting. The results showed that with the increase of replanting years, plant height, stem diameter, leaf area and aboveground and underground parts weight decreased significantly (P<0.05). In addition, mother buble weight positivly related to the vigorous seedling indexes and root/shoot ratio and stem diameter/plant height rario. By extending the period for replanting, the photosynthetic pigment content in leaves decreased significantly, the photosynthetic fluorescence parameters deteriorated, the activities of superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) decreased, the content of osmotic regulator malondialdehyde (MDA), proline (Pro) increased, and the soluble protein content decreased. The results demonsrated that long-term replanting caused adverse environment, which resulted in plant antioxidant activity metabolism unbalancing, PSⅡ photochemical effecience and photosynthetic efficiency decreasing, therefore, the plant growth declined. Plant stem diameter/plant height ratio can be used as a convenient indicator for evaluation the lily plant growth status at field. The results also suggested that the lily consecutive replant problem would occur so seriously after six years of replanting that the soil is unsuited to replant the lily again.

Key words: edibale lily, replant, vigorous seedling indexes, photosynthesis fluorescent parameters, antioxidant enzyme activity

CLC Number: