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Acta Prataculturae Sinica ›› 2023, Vol. 32 ›› Issue (6): 112-119.DOI: 10.11686/cyxb2022266

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Effect of arsenic stress on arsenic uptake and root morphological changes in seashore paspalum

Xiao-ming CHEN(), Dong-ying HAN, Gui-long SONG()   

  1. Grassland Science College,Beijing Forestry University,Beijing 100083,China
  • Received:2022-06-28 Revised:2022-07-29 Online:2023-06-20 Published:2023-04-21
  • Contact: Gui-long SONG

Abstract:

The effects of two arsenic (As) concentration treatments (10 and 100 mg·kg-1) on the growth and accumulative characteristics of five organs [stem, new leaf, old leaf, coarse root (diameter, D>0.5 mm) and fine root (D<0.5 mm)], of seashore paspalum (Paspalum vaginatum) were investigated in a pot experiment. It was found that: Under the high-As treatment, the growth of all organs of seashore paspalum was inhibited. The most obvious reduction was in the stem, which showed the characteristics of low tolerance and high intolerance. Coarse roots showed better As tolerance. The As content of plant tissue varied significantly between different seashore paspalum organs and was ranked fine roots>coarse roots>stems>new leaves>old leaves. The root response to As stress was that the growth of coarse roots was promoted and the growth of fine roots was inhibited. With increasing As concentration, the proportion of root length, root surface area and root volume of the D>0.5 mm root category gradually increased, while the proportion of diameter class D<0.5 mm decreased.

Key words: seashore paspalum, arsenic stress, root morphology, arsenic accumulation