Phloem-specific expression of the pumpkin fruit trypsin inhibitor

Joanne M. Dannenhoffer, Renee C. Suhr, Gary A. Thompson

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Vascular exudates of Cucurbita maxima (Duch.) contain a group of highly conserved serine proteinase inhibitors collectively called Pumpkin Fruit Trypsin Inhibitors (PFTIs) that prevent proteolytic activity of trypsin or chymotrypsin. Polyclonal antibodies raised against PFTIs were used to immunolocalize these low-molecular-weight proteins within the phloem tissue and to study their developmental expression. The inhibitors were translocated throughout the transport phloem and were present in vascular exudates collected from both source and sink tissues throughout the plant. During the early stages of vascular development, PFTIs accumulated specifically in sieve element-companion cell complexes of the phloem tissue. Transcripts were initially detected by reverse transcription-polymerase chain reaction in seedlings 1 d after germination and the protein detected 24 h later. Pumpkin fruit trypsin inhibitors were present in both cell types of differentiating and translocating sieve element-companion cell complexes. The inhibitors were detected in the phloem of the bicollateral vascular bundles, but the protein was most consistently localized within the cortical and bundle-associated extrafascicular phloem.

Original languageEnglish (US)
Pages (from-to)155-162
Number of pages8
JournalPlanta
Volume212
Issue number2
DOIs
StatePublished - Feb 20 2001

Fingerprint

Phloem
Cucurbita
Trypsin Inhibitors
pumpkins
trypsin inhibitors
phloem
Fruit
Blood Vessels
fruits
blood vessels
phloem companion cells
sieve elements
Exudates and Transudates
Cucurbita maxima
Proteins
Serine Proteinase Inhibitors
proteins
vascular bundles
chymotrypsin
serine proteinases

All Science Journal Classification (ASJC) codes

  • Genetics
  • Plant Science

Cite this

Dannenhoffer, Joanne M. ; Suhr, Renee C. ; Thompson, Gary A. / Phloem-specific expression of the pumpkin fruit trypsin inhibitor. In: Planta. 2001 ; Vol. 212, No. 2. pp. 155-162.
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Phloem-specific expression of the pumpkin fruit trypsin inhibitor. / Dannenhoffer, Joanne M.; Suhr, Renee C.; Thompson, Gary A.

In: Planta, Vol. 212, No. 2, 20.02.2001, p. 155-162.

Research output: Contribution to journalArticle

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