AhSL28, a senescence- and phosphate starvation-induced S-like RNase gene in Antirrhinum

Lizhi Liang, Zhao Lai, Wenshi Ma, Yansheng Zhang, Yongbiao Xue

Research output: Contribution to journalArticlepeer-review

35 Scopus citations


Several species of higher plants have been found to contain S-like ribonucleases (RNases), which are homologous to S-RNases controlling self-incompatibility. No S-like RNase genes have been isolated from self-incompatible Antirrhinum. To investigate the relationship between S- and S-like RNases, we cloned a gene named AhSL28 encoding an S-like RNase in Antirrhinum. Amino acid sequence, genomic structure and phylogenetic analyses indicated that AhSL28 is most similar to RNS2, an S-like RNase from Arabidopsis thaliana and formed a distinct subclass together with several other S-like RNases within the S-RNase superfamily. Unlike S-RNase genes in Antirrhinum, AhSL28 is not only expressed in pistils but also in leaves, petals, sepals and anthers, in particular, showing a strong expression in vascular tissues and transmitting track. Moreover, its RNA transcripts were induced during leaf senescence and phosphate (Pi) starvation but not by wounding, indicating that AhSL28 plays a role in remobilizing Pi and other nutrients, particularly when cells senesce and are under limited Pi conditions in Antirrhinum. Possible evolutionary relations of S- and S-like RNases as well as signal transduction pathways related to S-like RNase action are discussed.

Original languageEnglish (US)
Pages (from-to)64-71
Number of pages8
JournalBiochimica et Biophysica Acta - Gene Structure and Expression
Issue number1
StatePublished - Nov 13 2002
Externally publishedYes


  • AhSL28
  • Antirrhinum
  • Phosphate starvation
  • S-like RNase
  • Senescence

ASJC Scopus subject areas

  • Structural Biology
  • Biophysics
  • Biochemistry
  • Genetics


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