Water balance, hormone homeostasis, and sugar signaling are all involved in tomato resistance to Tomato yellow leaf curl virus

Dagan Sade, Nir Sade, Oz Shriki, Stephen Lerner, Alem Gebremedhin, Asaf Karavani, Yariv Brotman, Sonia Osorio, Alisdair R. Fernie, Lothar Willmitzer, Henryk Czosnek, Menachem Moshelion

Research output: Contribution to journalArticlepeer-review

Abstract

Vacuolar water movement is largely controlled by membrane channels called tonoplast-intrinsic aquaporins (TIP-AQPs). Some TIP-AQP genes, such as TIP2;2 and TIP1;1, are up-regulated upon exposure to biotic stress. Moreover, TIP1;1 transcript levels are higher in leaves of a tomato (Solanum lycopersicum) line resistant to Tomato yellow leaf curl virus (TYLCV) than in those of a susceptible line with a similar genetic background. Virus-induced silencing of TIP1;1 in the tomato resistant line and the use of an Arabidopsis (Arabidopsis thaliana) tip1;1 null mutant showed that resistance to TYLCV is severely compromised in the absence of TIP1:1. Constitutive expression of tomato TIP2;2 in transgenic TYLCV-susceptible tomato and Arabidopsis plants was correlated with increased TYLCV resistance, increased transpiration, decreased abscisic acid levels, and increased salicylic acid levels at the early stages of infection. We propose that TIP-AQPs affect the induction of leaf abscisic acid, which leads to increased levels of transpiration and gas exchange, as well as better salicylic acid signaling.

Original languageEnglish
Pages (from-to)1684-1697
Number of pages14
JournalPlant Physiology
Volume165
Issue number4
DOIs
StatePublished - Aug 2014
Externally publishedYes

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