Cl- uptake, transport and accumulation in grapevine rootstocks of differing capacity for Cl--exclusion

Joanna M. Tregeagle, Judy M. Tisdall, Mark Tester, Rob R. Walker

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

Mechanisms of chloride (Cl-) exclusion in rootstocks of grapevine (Vitis spp.) were studied using a strong Cl--excluding rootstock (140 Ruggeri) and a poor Cl--excluding rootstock (K51-40). Xylem Cl- concentration in potted whole grapevines of 140 Ruggeri treated with 50mM Cl- was 6.8-fold lower than that in K5140. Five-fold lower total shoot Cl- in salt-treated 140 Ruggeri grapevines relative to that in K51-40 after 50 days, when shoots were of similar biomass, was unrelated to water use. Unidirectional influx of 36Cl- into excised roots (up to 30min), and uptake of 36Cl- in roots of intact rooted-leaves (up to 180min) in 10mM Cl- was similar between the genotypes. However, net accumulation of Cl- by excised roots of K51-40 up to 180min in 10mM Cl - was significantly higher than that of 140 Ruggeri. Intact rooted-leaves of 140 Ruggeri in 10mM Cl- accumulated higher Cl - concentrations in roots, and had a lower percentage of total plant 36Cl- accumulation in the shoot (petiole plus lamina) than those of K51-40. The greater Cl- exclusion capacity of 140 Ruggeri appears to be associated with restricted entry of Cl- to xylem and lower root to shoot Cl- transport.

Original languageEnglish (US)
Pages (from-to)665-673
Number of pages9
JournalFunctional Plant Biology
Volume37
Issue number7
DOIs
StatePublished - Jul 16 2010

Keywords

  • 140 Ruggeri
  • K51-40
  • anion
  • influx
  • roots
  • salinity

ASJC Scopus subject areas

  • Agronomy and Crop Science
  • Plant Science

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