Involvement of polyamines in the drought resistance of rice

Jianchang Yang, Jianhua ZHANG*, Kai Liu, Zhiqin Wang, Lijun Liu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

163 Citations (Scopus)

Abstract

This study investigated whether and how polyamines (PAs) in rice (Oryza sativa L.) plants are involved in drought resistance. Six rice cultivars differing in drought resistance were used and subjected to well-watered and water-stressed treatments during their reproductive period. The activities of arginine decarboxylase, S-adenosyl-L-methionine decarboxylase, and spermidine (Spd) synthase in the leaves were significantly enhanced by water stress, in good agreement with the increase in putrescine (Put), Spd, and spermine (Spm) contents there. The increased contents of free Spd, free Spm, and insoluble-conjugated Put under water stress were significantly correlated with the yield maintenance ratio (the ratio of grain yield under water-stressed conditions to grain yield under well-watered conditions) of the cultivars. Free Put at an early stage of water stress positively, whereas at a later stage negatively, correlated with the yield maintenance ratio. No significant differences were observed in soluble-conjugated PAs and insoluble-conjugated Spd and Spm among the cultivars. Free PAs showed significant accumulation when leaf water potentials reached -0.51 MPa to -0.62 MPa for the drought-resistant cultivars and -0.70 MPa to -0.84 MPa for the drought-susceptible ones. The results suggest that rice has a large capacity to enhance PA biosynthesis in leaves in response to water stress. The role of PAs in plant defence to water stress varies with PA forms and stress stages. In adapting to drought it would be good for rice to have the physiological traits of higher levels of free Spd/free Spm and insoluble-conjugated Put, as well as early accumulation of free PAs, under water stress.

Original languageEnglish
Pages (from-to)1545-1555
Number of pages11
JournalJournal of Experimental Botany
Volume58
Issue number6
DOIs
Publication statusPublished - May 2007

Scopus Subject Areas

  • Physiology
  • Plant Science

User-Defined Keywords

  • Arginine decarboxylase (ADC)
  • Drought resistance
  • Ornithine decarboxylase (ODC)
  • Polyamines
  • Rice
  • S-adenosyl-L-methionine decarboxylase (SAMDC)
  • Spermidine synthase
  • Water stress

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