AUTHOR=Mubarok Syariful , Jadid Nurul , Widiastuti Ani , Derajat Matra Deden , Budiarto Rahmat , Lestari Fitrianti Widya , Nuraini Anne , Suminar Erni , Pradana Nur Rahmat Bayu , Ezura Hiroshi 

TITLE=Parthenocarpic tomato mutants, iaa9-3 and iaa9-5, show plant adaptability and fruiting ability under heat-stress conditions

JOURNAL=Frontiers in Plant Science

VOLUME=14

YEAR=2023

URL=https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2023.1090774

DOI=10.3389/fpls.2023.1090774

ISSN=1664-462X

ABSTRACT=<p>Fruit set is one of the main problems that arise in tomato plants under heat-stress conditions, which disrupt pollen development, resulting in decreased pollen fertility. Parthenocarpic tomatoes can be used to increase plant productivity during failure of the fertilisation process under heat-stress conditions. The aim of this study were to identify the plant adaptability and fruiting capability of ?<italic>iaa9-3</italic> and <italic>iaa9-5</italic> tomato mutants under heat-stress conditions. The <italic>iaa9-3</italic> and <italic>iaa9-5</italic> and wild-type Micro-Tom (WT-MT) plants were cultivated under two temperature conditions: normal and heat-stress conditions during plant growth. The results showed that under the heat-stress condition, <italic>iaa9-3</italic> and <italic>iaa9-5</italic> showed delayed flowering time, increased number of flowers, and increased fruit set and produced normal-sized fruit. However, WT-MT cannot produce fruits under heat stress. The mutants can grow under heat-stress conditions, as indicated by the lower electrolyte leakage and H<sub>2</sub>O<sub>2</sub> concentration and higher antioxidant activities compared with WT-MT under heat-stress conditions. These results suggest that <italic>iaa9-3</italic> and <italic>iaa9-5</italic> can be valuable genetic resources for the development of tomatoes in high-temperature environmental conditions. </p>