Does scion–rootstock compatibility modulate photoassimilate and hormone trafficking through the graft junction in melon–pumpkin graft combinations?

Maria Dolores Camalle, Noga Sikron, Udi Zurgil, Janardan Khadka, Shimon Pivonia, Aleš Pěnčík, Ondřej Novák, Aaron Fait, Noemi Tel-Zur

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

The effect of the rootstock on the acropetal and basipetal transport of photoassimilates and hormones was studied in the 'Kiran' (Ki) melon cultivar grafted onto pumpkin rootstocks with different degrees of compatibility. A complementary experiment was performed to compare the incompatible combination (as evidenced by plant collapse at the fruit ripening stage), designated Ki/r53, with self-grafted r53/r53 as a model compatible combination. Both experiments showed the accumulation of a number of amino acids, sugars, and sugar alcohols in the scion of the incompatible Ki/r53 grafts. Additionally, they showed a marked reduction of trans-zeatin-type cytokinins and an elevated content of cis-zeatin-type cytokinins in the rootstock, and the opposite pattern in the scion, hinting at the possible involvement of a hormonal signal for graft compatibility. There was no direct evidence of a blockage at the graft union, since hormone acropetal and basipetal trafficking was demonstrated for all combinations. Dye uptake experiments did not show xylem flow impairment. A possibly significant finding in the incompatible combination was the deposition of undifferentiated cells in the hollow space that replaces the pith region in melon and pumpkin. The link between the above findings and the collapse of the plants of the incompatible combination remains unclear.

Original languageEnglish
Article number110852
JournalPlant Science
Volume306
DOIs
StatePublished - 1 May 2021

Keywords

  • Grafted plants
  • Hormone
  • Metabolites
  • Sap
  • Yield

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Genetics
  • Plant Science

Fingerprint

Dive into the research topics of 'Does scion–rootstock compatibility modulate photoassimilate and hormone trafficking through the graft junction in melon–pumpkin graft combinations?'. Together they form a unique fingerprint.

Cite this