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POSTERS: Late Breaking II

P-678 - Assessment of Biological Development and Drought Tolerance on Tomato Growing under Different Irrigation Conditions

Tuesday, August 5, 2025
10:15 AM - 11:00 AM HST
Location: Exhibit Hall 3
Abstract Text:

Tomatoes (Solanum lycopersicum) are highly nutritious and valuable, and are widely cultivated. Tomatoes are severely affected by adverse biotic and abiotic stresses when climate change and global warming increase. This study was to evaluate the growth under limited irrigation conditions and to determine SlHB2 and SlSHN1 genes associated with drought tolerance. The study was conducted on five commercial tomato varieties, including cherry CN1 (Germany), chocolate cherry PD1 (Japan), cherry HT1, VA1 and beef B1 (Vietnam) were grown in a greenhouse. The seedlings were transferred to pots after 6 weeks, different watering regimes were applied: The control plot was watered daily, while the experimental plots were 1, 3, 5, and 7 consecutive days without watering, then watering for one week, repeated the watering regime until harvest. The results showed (i) There was no significant difference in growth between the control and 1 day treated plot. The 7-day no watering plot had stunted growth, pale and curled leaves, and 100% of the plants died after the first flower cluster appeared; (ii) The fruit setting rate was low and decreased significantly from 20% to 16% and 10%, respectively, for the 1-day, 3-day, and 5-day consecutive days without watering; (iii) The PD1-3, CN1-5, B1-5, HT1-5, and B1-7 samples expressed the SlHB2 gene, while the CN1-5, PD1-5, and B1-7 samples contained the SlSHN1 gene. These results indicate that water deprivation has a significant negatively impact on tomato growth and drought tolerance mechanism may be controlled by multiple genes.