AI Article Synopsis
- A second positive phototropic response in plants occurs after a specific time threshold of light exposure.
- For Arabidopsis thaliana, this time threshold is approximately 15 minutes, which can be reduced to around 4 minutes with prior exposure to 669-nanometer light.
- Tobacco seedlings have a longer initial threshold of about 60 minutes, which drops to about 15 minutes when exposed to 450- or 669-nanometer light beforehand, highlighting the complexity in how light exposure influences plant growth responses.
Article Abstract
A second positive phototropic response is exhibited by a plant after the time of irradiation has exceeded a time threshold. The time threshold of dark-grown seedlings is about 15 minutes for Arabidopsis thaliana. This threshold is decreased to about 4 minutes by a 669-nanometer preirradiation. Tobacco (Nicotiana tabacum) seedlings show a similar response. The time threshold of dark-grown seedlings is about 60 minutes for tobacco, and is decreased to about 15 minutes after a preirradiation with either 450- or 669- nanometer light. The existence of a time threshold for second positive phototropism and the dependence of this threshold on the irradiation history of the seedling contribute to the complexity of the fluence response relationship for phototropism.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1080642 | PMC |
| http://dx.doi.org/10.1104/pp.99.4.1422 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!