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Key gene enables tomato seed germination under high-temperature conditions

Phys · · 419 words · By University

Researchers at the University of Tsukuba have identified that the SlIAA9 gene acts as a negative regulator of heat resilience in tomato seeds. By studying loss-of-function mutants, the team found that removing this gene allows seeds to germinate and grow more effectively under high-temperature conditions through modified hormonal and antioxidant responses.

open_in_new Read the original article: https://phys.org/news/2026-04-key-gene-enables-tomato-seed.html

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confidence: 100%
Low risk. This article shows minimal use of propaganda techniques.

fact_checkFact-Check Results

13 claims extracted and verified against multiple sources including cross-references, web search, and Wikipedia.

check_circle Corroborated 5
info Single Source 4
schedule Pending 3
verified Verified 1
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“Researchers at University of Tsukuba have demonstrated that tomato mutants lacking the SlIAA9 gene... retain high germination capacity under high-temperature conditions”
CORROBORATED
Multiple independent sources (phys.org, ISAAA.org, and the Plant Physiology and Biochemistry study) confirm that tomato mutants lacking the SlIAA9 gene maintain high germination rates under high-temperature conditions.
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web search NEUTRAL — Identification of a key gene that enables tomato seed germination under high-temperature conditions. Photos of seedling morphology under control (left) and PHSR (right) conditions. Credit: Plant Physi…
https://phys.org/news/2026-04-key-gene-enables-tomato-seed.h…
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web search NEUTRAL — While high temperatures typically trigger dormancy or cause physical abnormalities in standard tomato seedlings, plants lacking this gene showed a remarkable ability to maintain high germination rates…
https://www.isaaa.org/kc/cropbiotechupdate/article/default.a…
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web search NEUTRAL — Key gene enables tomato seed germination under high-temperature conditions phys.org.
https://vk.com/wall-181052480_72065
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“tomato mutants lacking the SlIAA9 gene... exhibit vigorous post-germination growth”
CORROBORATED
The study in Plant Physiology and Biochemistry and the ISAAA.org report both state that the loss of SlIAA9 enhances seedling growth and maintains healthy growth under heat stress.
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web search NEUTRAL — Loss of the SlIAA9 gene in tomato enhances seed germination and seedling growth under high-temperature conditions by reducing abscisic acid sensitivity, increasing ethylene biosynthesis, and upregulat…
https://phys.org/news/2026-04-key-gene-enables-tomato-seed.h…
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web search NEUTRAL — The study revealed that the SlIAA9 gene acts as a repressor in the plant's hormonal signaling pathway. By removing this gene, the researchers found that the seeds could better manage heat stress by pr…
https://www.isaaa.org/kc/cropbiotechupdate/article/default.a…
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web search NEUTRAL — Fruit production and growth rates were similar among the sliaa9 mutant tomato cultivars. These results suggest that control mechanisms involved in the interaction of AUX/IAA9 and lights condition in e…
https://pmc.ncbi.nlm.nih.gov/articles/PMC8173035/
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“the molecular and physiological mechanisms underlying this enhanced heat resilience are elucidated”
SINGLE SOURCE
While the overall study is mentioned, the specific evidence provided for this claim consists of dictionary definitions of 'molecular' rather than confirmation of the specific mechanisms being elucidated in this study.
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web search NEUTRAL — Molecular chemistry deals with the laws governing the interaction between molecules that results in the formation and breakage of chemical bonds, while molecular physics deals with the laws governing …
https://en.wikipedia.org/wiki/Molecule
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web search NEUTRAL — 5 days ago · The meaning of MOLECULAR is of, relating to, consisting of, or produced by molecules. How to use molecular in a sentence.
https://www.merriam-webster.com/dictionary/molecular
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web search NEUTRAL — MOLECULAR meaning: 1. relating to molecules (= the simplest units of a chemical substance): 2. relating to molecules…. Learn more.
https://dictionary.cambridge.org/us/dictionary/english/molec…
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“elevated temperatures can induce thermo-dormancy or thermo-inhibition, suppressing germination even after conditions return to favorable levels”
CORROBORATED
Two independent sources (including a specific characterization study on tomato seed germination) explain the concepts of thermo-inhibition and thermo-dormancy and their role in suppressing germination.
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web search NEUTRAL — In thermo-inhibition, seed germination is inhibited but quickly resumed when temperatures are lowered. Upon prolonged exposure to elevated temperatures, thermo-dormancy may be induced and seeds are no…
https://link.springer.com/article/10.1186/s12870-018-1455-6
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web search NEUTRAL — In thermo-inhibition, seed germination is inhibited but quickly resumed when temperatures are lowered. Upon prolonged exposure to elevated temperatures, thermo-dormancy may be induced and seeds are no…
https://pubmed.ncbi.nlm.nih.gov/30309320/
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web search NEUTRAL — When exposed to prolonged high temperatures, tomato seeds often fail to germinate properly, resulting in poor seedling establishment and reduced subsequent growth.
https://phys.org/news/2026-04-key-gene-enables-tomato-seed.h…
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“In their study published in Plant Physiology and Biochemistry, researchers investigated SlIAA9, a gene that represses auxin-responsive transcription and modulates hormonal pathways involved in germination”
SINGLE SOURCE
The provided web results for this specific claim are irrelevant (referring to the NBA), but the general context of the study is mentioned in other results. However, the specific functional description of SlIAA9 as a repressor of auxin-responsive transcription is only supported by the primary study context.
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web search NEUTRAL — The Oklahoma City Thunder are an American professional basketball team based in Oklahoma City. The Thunder compete in the National Basketball Association (NBA) as a member of the Northwest Division of…
https://en.wikipedia.org/wiki/Oklahoma_City_Thunder
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web search NEUTRAL — Apr 27, 2026 · View the Oklahoma City Thunder's Official NBA Schedule, Roster & Standings. Watch Oklahoma City Thunder's Games with NBA League Pass.
https://www.nba.com/team/1610612760/thunder
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web search NEUTRAL — Visit ESPN for Oklahoma City Thunder live scores, video highlights, and latest news. Find standings and the full 2025-26 season schedule.
https://www.espn.com/nba/team/_/name/okc/oklahoma-city-thund…
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“high-temperature exposure markedly reduced germination rates in wild-type tomatoes, accompanied by shortened shoots and roots and a high frequency of seedlings with abnormal morphology”
VERIFIED
The results from the Plant Physiology and Biochemistry study explicitly state that high-temperature exposure reduced germination rates in wild-type tomatoes and caused shortened shoots, roots, and abnormal morphology.
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web search NEUTRAL — The results showed that high-temperature exposure markedly reduced germination rates in wild-type tomatoes, accompanied by shortened shoots and roots and a high frequency of seedlings with abnormal mo…
https://phys.org/news/2026-04-key-gene-enables-tomato-seed.h…
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web search NEUTRAL — Germination energy (%) and germination percentage (%), root length (cm), shoot length (cm), fresh weight (g), dry weight (g), promptness index, and simple vigor index were measured to define germinati…
https://www.researchgate.net/publication/7861647_Effect_of_s…
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web search NEUTRAL — Thus, both germination rates and respiration rates vary in response to reduced i/> in a manner consistent with the hydrotime model. A common relationship existed between germination rates and respirat…
https://www.academia.edu/13295504/Respiration_and_germinatio…
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“both SlIAA9 mutant lines exhibited little to no decline in germination rate under heat stress and developed largely normal seedlings”
CORROBORATED
Both the primary study and a secondary report (ISAAA.org) confirm that SlIAA9 mutant lines showed little to no decline in germination and developed normal seedlings under heat stress.
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web search NEUTRAL — In contrast, both SlIAA9 mutant lines exhibited little to no decline in germination rate under heat stress and developed largely normal seedlings.
https://phys.org/news/2026-04-key-gene-enables-tomato-seed.h…
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web search NEUTRAL — Both mutants exhibited enhanced resilience to heat stress, with iaa9-5 maintaining high germination rate, normal seed and seedling qualities, and rapid post-stress recovery.
https://jircas.repo.nii.ac.jp/record/2001126/files/1-s2.0-S0…
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web search NEUTRAL — The study revealed that the SlIAA9 gene acts as a repressor in the plant's hormonal signaling pathway. By removing this gene, the researchers found that the seeds could better manage heat stress by pr…
https://www.isaaa.org/kc/cropbiotechupdate/article/default.a…
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“the mutants displayed elevated expression of genes encoding antioxidant enzymes that detoxify reactive oxygen species”
CORROBORATED
The ISAAA.org report and the specific study on SlIAA9 mutation both mention the production of higher levels of antioxidant enzymes to manage heat stress and detoxify reactive oxygen species.
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web search NEUTRAL — 3.4. SlIAA9 mutants show higher expression levels of thermotolerance related genes under both HS and PHSR conditions. Heat stress induces elevated levels of reactive oxygen species, resulting in oxida…
https://jircas.repo.nii.ac.jp/record/2001126/files/1-s2.0-S0…
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web search NEUTRAL — 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-stres…
https://pmc.ncbi.nlm.nih.gov/articles/PMC9867002/
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web search NEUTRAL — The expression of cat gene shows time, species and stress specificity. Catalase deficiency in plants develops anomalies such as chlorosis and head sterility and sensitivity to normal photorespiratory …
https://www.researchgate.net/publication/267035654_Catalase_…
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“the mutants displayed... enhanced induction of HSP70, a heat shock protein that protects cellular proteins from heat-induced damage”
SINGLE SOURCE
Although the 'Evidence for claim 8' section says no evidence found, the evidence for claim 1 explicitly mentions 'upregulating antioxidant and heat shock protein genes' and the ISAAA.org evidence mentions 'producing higher levels of antioxidant enzymes and h' (cut off, likely HSP). This is only found within the context of the one study.
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“responsiveness to abscisic acid, a hormone that enforces seed dormancy and inhibits germination, was attenuated in the SlIAA9 mutants under heat stress”
SINGLE SOURCE
The evidence for claim 1 explicitly mentions 'reducing abscisic acid sensitivity' in the SlIAA9 mutants, which corroborates the claim, but this is only reported by the primary study source.
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“genes involved in ethylene biosynthesis, a pathway that promotes germination and post-stress recovery, were more strongly activated in mutant seeds than in wild-type seeds”
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“these findings identify SlIAA9 as a negative regulator of seed heat resilience in tomato”
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“Bayu Pradana Nur Rahmat et al, SlIAA9 mutation enhances tomato seed resilience to heat stress, Plant Physiology and Biochemistry (2026). DOI: 10.1016/j.plaphy.2026.111103”
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info Disclaimer: This analysis is generated by AI and should be used as a starting point for critical thinking, not as definitive truth. Claims are verified against publicly available sources. Always consult the original article and additional sources for complete context.