Gravity-regulated formation of the peg in developing cucumber seedlings

Hideyuki Takahashi, Tom K. Scott

Research output: Contribution to journalArticlepeer-review

16 Citations (Scopus)


It has been proposed that peg formation in the vascular transition region (TR zone) between the hypocotyl and the root in Cucurbitaceae seedlings is a gravimorphogenetic phenomenon. Initiation of the peg became visible 36 h after imbibition when cucumber (Cucumis sativus L. cv. Burpee Hybrid II) seeds were germinated in a horizontal position at 24°C in the dark. Simultaneously, sedimented amyloplasts (putative statoliths) were apparent in the sheath cells surrounding the vascular strands, and in the cortical cells immediately adjacent to them, in the TR zone. In contrast, the other cortical cells, some of which were destined to develop into the peg, contained amyloplasts which were not sedimented. These results suggest that the graviperception mechanism for peg formation may be like that of statoliths in shoot gravitropism. By 48 h following imbibition, the cells of the TR zone still had sedimented amyloplasts but had lost their sensitivity to gravity, possibly because of their maturation.

Original languageEnglish
Pages (from-to)580-584
Number of pages5
Issue number4
Publication statusPublished - 1994 May 1


  • Amyloplast
  • Cucumis (peg formation)
  • Graviperception
  • Peg formation (Cucurbitaceae)
  • Root-shoot transition zone
  • Statolith

ASJC Scopus subject areas

  • Genetics
  • Plant Science


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