Welcome to Acta Prataculturae Sinica ! Today is Share:

Acta Prataculturae Sinica ›› 2022, Vol. 31 ›› Issue (2): 203-212.DOI: 10.11686/cyxb2020521

Previous Articles    

Effects of drought stress on root characteristics structure and physiological characteristics of Potentilla bifurca var. glabrata

Peng-fei GAO(), Jing ZHANG, Wei-fang FAN, Bing GAO, Hong-juan HAO, Jian-hui WU()   

  1. College of Landscape Architecture,Northeast Forestry University,Harbin 150040,China
  • Received:2020-11-25 Revised:2021-03-15 Online:2022-02-20 Published:2021-12-22
  • Contact: Jian-hui WU

Abstract:

In this research a natural water control method was used to study the effects of different drought treatments on the phenotypic characteristics, ultrastructure and physiological indexes of roots of Potentilla bifurca var. glabrata and to explore the drought tolerance of this species. It was found that under drought stress, the total root length, total surface area, total volume and average diameter of P. bifurca var. glabrata increased continuously over days 0-25. The root dry weight increased over days 0-15 d, but decreased significantly over days 20-25 d (P<0.05). With increased drought stress, the root cell wall was deformed and damaged, the mitochondria disintegrated and disappeared, and starch grains appeared and continuously expanded. Malondialdehyde (MDA) content and proline content were increased over days 0-25. Soluble protein content and superoxide dismutase (SOD) activity increased significantly over days 0-15, and decreased significantly over days 20-25 d (P<0.05). After rehydration, the contents of proline and soluble protein decreased nonsignificantly (P>0.05), while MDA content and SOD activity decreased significantly (P<0.05). Generally speaking, P. bifurca var. glabrata can endure natural drought for 20 d and has strong drought resistance. These results provide information for the breeding of drought-tolerant plants in Northeast China.

Key words: Potentilla bifurca var. glabrata, drought stress, root system characteristics, structural characteristics, physiological characteristics