SlIAA9 Mutation Maintains Photosynthetic Capabilities under Heat-Stress Conditions

Bayu Pradana Nur Rahmat, Grace Octavianis, Rahmat Budiarto, Nurul Jadid, Ani Widiastuti, Deden Derajat Matra, Hiroshi Ezura, Syariful Mubarok*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Tomato is one of the most widely consumed horticultural products. However, tomato is very sensitive to changes in temperature. Daily average temperatures above 32 °C severely reduced tomato plant growth, development, and productivity. Therefore, climate change-induced global warming is a major threat to future tomato production. Good photosynthetic capability under heat stress conditions is known to be a major sign of heat tolerance. Tomato INDOLE-ACETIC-ACID (SlIAA9) is a transcriptional repressor in auxin signaling. SlIAA9 mutation caused heightened endogenous auxin response and biosynthesis within plant tissues. In this study, we studied the photosynthetic capability of iaa9-3 and iaa9-5 mutants under heat-stress conditions. We discovered that both iaa9-3 and iaa9-5 could maintain their photosynthetic capability after 14 days of heat treatment (>40 °C), differing from Wild Type-Micro-Tom (WT-MT) tomato. Both iaa9 mutants had higher net photosynthetic rate, stomatal conductance, leaf total chlorophyll, leaf carotenoids, Fv/Fm value, and lower leaf MDA than WT-MT. These results suggested that the SlIAA9 mutation benefits plant adaptation to heat stress.

Original languageEnglish
Article number378
Issue number2
Publication statusPublished - Jan 2023


  • SlIAA9 mutation
  • heat stress
  • heat tolerance
  • photosynthesis
  • photosynthetic rate
  • tomato


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