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Research article
Zhenhua Li
Corresponding Author
ORCiD: https://orcid.org/0000-0001-8087-0687
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Background: Phytochrome is the most abundant photoreceptor in Arabidopsis thaliana ( Arabidopsis ), which integrates light and temperature signals, and in turn regulates plant development. However, the exact pattern of integrated signals during seed germination remains unknown. In this study, we analyzed the effect of NtPHYB1 genotype in response to ecological environments in Nicotiana tabacum L. Results: The germination frequencies of WT seeds showed at least no significant difference, and were significantly higher than that of NtPHYB1 - GFP and NtPHYB1 -RNAi seeds in some environments or. According to the maximum germination frequency , germination of NtPHYB1 - GFP seeds was mainly inhibited by continuous light exposure, while the germination of NtPHYB1- RNAi seeds was repressed by low temperature and no light (darkness) exposure. At 15ºC, the germinations of all three genotypic seeds were inhibited by the low-temperature, and the germination frequency of NtPHYB1 - GFP seeds was significantly lower than that of WT and NtPHYB1 -RNAi seeds; while light signal had no effect at 15ºC. At 20 and 25ºC, the temperature signal promoted germination, and the signal of light was dispensable. At this condition, the maximum germination frequencies were obtained for NtPHYB1 - GFP and WT seeds. At 30 and 35ºC, the light signal was indispensable to maintain seed germination for all three genotypic seeds. At this condition, NtPHYB1 -RNAi seeds reached the maximum germination frequency. Conclusion: Phytochrome B regulates seed germination by integrating light and temperature signals. The above results elucidate why warm spring and autumn (about 25ºC) are more suitable for sowing compared to cool winters (less than 15ºC) and hot summers (greater than 30ºC).
Keywords
Seed germination, photothermal sensitivity, photothermal signal, natural selection, seasonal variation
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A new preprint design is coming!
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This is a preprint, a preliminary version of a manuscript that has not completed peer review at a journal. Research Square does not conduct peer review prior to posting preprints. The posting of a preprint on this server should not be interpreted as an endorsement of its validity or suitability for dissemination as established information or for guiding clinical practice.
Research article
Zhenhua Li
Corresponding Author
ORCiD: https://orcid.org/0000-0001-8087-0687
Badges
Prescreen
This manuscript passed our Prescreen assessment
Complete author information
Appropriate declaration statements
Potential risks to human health
Prescreen
History
CURRENT STATUS: Posted
Version 1
Posted 22 Oct, 2019
No community comments so far
Metrics
Comments: 0
PDF Downloads: ...
HTML Views: ...
License:
This work is licensed under a CC BY 4.0 License. Read Full License
Background: Phytochrome is the most abundant photoreceptor in Arabidopsis thaliana ( Arabidopsis ), which integrates light and temperature signals, and in turn regulates plant development. However, the exact pattern of integrated signals during seed germination remains unknown. In this study, we analyzed the effect of NtPHYB1 genotype in response to ecological environments in Nicotiana tabacum L. Results: The germination frequencies of WT seeds showed at least no significant difference, and were significantly higher than that of NtPHYB1 - GFP and NtPHYB1 -RNAi seeds in some environments or. According to the maximum germination frequency , germination of NtPHYB1 - GFP seeds was mainly inhibited by continuous light exposure, while the germination of NtPHYB1- RNAi seeds was repressed by low temperature and no light (darkness) exposure. At 15ºC, the germinations of all three genotypic seeds were inhibited by the low-temperature, and the germination frequency of NtPHYB1 - GFP seeds was significantly lower than that of WT and NtPHYB1 -RNAi seeds; while light signal had no effect at 15ºC. At 20 and 25ºC, the temperature signal promoted germination, and the signal of light was dispensable. At this condition, the maximum germination frequencies were obtained for NtPHYB1 - GFP and WT seeds. At 30 and 35ºC, the light signal was indispensable to maintain seed germination for all three genotypic seeds. At this condition, NtPHYB1 -RNAi seeds reached the maximum germination frequency. Conclusion: Phytochrome B regulates seed germination by integrating light and temperature signals. The above results elucidate why warm spring and autumn (about 25ºC) are more suitable for sowing compared to cool winters (less than 15ºC) and hot summers (greater than 30ºC).
Figure 1
Figure 2
Figure 3
Figure 4
This is a list of supplementary files associated with this preprint. Click to download.
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