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Red to far-red ratio during seed development affects lettuce seed germinability and longevity
Year:
2009
Source of publication :
HortScience
Authors :
Nerson, Haim
;
.
Volume :
44
Co-Authors:
Contreras, S., Departamento de Ciencias Vegetales, Pontificia Universidad Catolica de Chile, Av Vic Mackenna 4860, Casilla 306-22, Santiago, Chile
Bennett, M.A., Department of Horticulture and Crop Science, Ohio State University, Columbus, OH 43210-1086, United States
Metzger, J.D., Department of Horticulture and Crop Science, Ohio State University, Columbus, OH 43210-1086, United States
Tay, D., Ornamental Plant Germplasm Center, Ohio State University, Columbus, OH 43210-1086, United States, International Potato Center, Apartado 1558, Lima 12, Peru
Nerson, H., Agricultural Research Organization, Department of Vegetable Crops, Newe Ya'ar Research Center, P.O. Box 1021, Ramat Yishay, 30095, Israel
Facilitators :
From page:
130
To page:
134
(
Total pages:
5
)
Abstract:
Thermoinhibition and photosensitivity are two characteristics of lettuce seed that frequently affect its stand. The main objective of this study was to evaluate the hypothesis that lettuce seed germinability and longevity are affected by the red to far-red light ratio (R:FR) under which seeds maturate. 'Tango' lettuce seeds were produced in growth chambers under one of two treatments: 1) red-rich light (R treatment) and 2) far-red-rich light (FR treatment). For both treatments, the percentage of normal seedlings germinated at 20 °C-light was ≈100%. When germinated under the light, seeds from the R treatment exhibited a higher germination percentage and a faster germination (under a broader range of temperatures) than seeds from the FR treatment. When germinated in the dark, seeds from the R treatment germinated 100% between 12 and 23 °C and over 50% at 30 °C, whereas seeds from the FR treatment germinated less than 35% between 12 and 23 °C and less than 5% at 30 °C. Seeds from the R treatment had lower abscisic acid (ABA) content and were better able to germinate when exposed to external ABA concentrations than seeds from the FR treatment. Seed longevity as assessed by the accelerated aging test was higher in seeds from the FR treatment, indicating that red-rich light was detrimental to longevity. In another experiment, lettuce seeds that developed under similar conditions were harvested at approximately the momemt of maximum dry weight accumulation and desiccated in dark, far-red, red, or fluorescent + incandescent light. Seeds desiccated under red light exhibited higher dark germination than the other treatments; however, no differences were observed in thermoinhibition or longevity. These results suggest that lettuce seed produced in an environment with a high R:FR light ratio will exhibit reduced thermoinhibition and photosensitivity as compared with production in a lower R:FR light environment.
Note:
Related Files :
Abscisic acid
Lactuca
Lactuca sativa
light
Maternal environment
Photo-sensitivity
seed development
Thermoinhibition
Show More
Related Content
More details
DOI :
Article number:
Affiliations:
Database:
Scopus
Publication Type:
article
;
.
Language:
English
Editors' remarks:
ID:
21520
Last updated date:
02/03/2022 17:27
Creation date:
16/04/2018 23:44
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Scientific Publication
Red to far-red ratio during seed development affects lettuce seed germinability and longevity
44
Contreras, S., Departamento de Ciencias Vegetales, Pontificia Universidad Catolica de Chile, Av Vic Mackenna 4860, Casilla 306-22, Santiago, Chile
Bennett, M.A., Department of Horticulture and Crop Science, Ohio State University, Columbus, OH 43210-1086, United States
Metzger, J.D., Department of Horticulture and Crop Science, Ohio State University, Columbus, OH 43210-1086, United States
Tay, D., Ornamental Plant Germplasm Center, Ohio State University, Columbus, OH 43210-1086, United States, International Potato Center, Apartado 1558, Lima 12, Peru
Nerson, H., Agricultural Research Organization, Department of Vegetable Crops, Newe Ya'ar Research Center, P.O. Box 1021, Ramat Yishay, 30095, Israel
Red to far-red ratio during seed development affects lettuce seed germinability and longevity
Thermoinhibition and photosensitivity are two characteristics of lettuce seed that frequently affect its stand. The main objective of this study was to evaluate the hypothesis that lettuce seed germinability and longevity are affected by the red to far-red light ratio (R:FR) under which seeds maturate. 'Tango' lettuce seeds were produced in growth chambers under one of two treatments: 1) red-rich light (R treatment) and 2) far-red-rich light (FR treatment). For both treatments, the percentage of normal seedlings germinated at 20 °C-light was ≈100%. When germinated under the light, seeds from the R treatment exhibited a higher germination percentage and a faster germination (under a broader range of temperatures) than seeds from the FR treatment. When germinated in the dark, seeds from the R treatment germinated 100% between 12 and 23 °C and over 50% at 30 °C, whereas seeds from the FR treatment germinated less than 35% between 12 and 23 °C and less than 5% at 30 °C. Seeds from the R treatment had lower abscisic acid (ABA) content and were better able to germinate when exposed to external ABA concentrations than seeds from the FR treatment. Seed longevity as assessed by the accelerated aging test was higher in seeds from the FR treatment, indicating that red-rich light was detrimental to longevity. In another experiment, lettuce seeds that developed under similar conditions were harvested at approximately the momemt of maximum dry weight accumulation and desiccated in dark, far-red, red, or fluorescent + incandescent light. Seeds desiccated under red light exhibited higher dark germination than the other treatments; however, no differences were observed in thermoinhibition or longevity. These results suggest that lettuce seed produced in an environment with a high R:FR light ratio will exhibit reduced thermoinhibition and photosensitivity as compared with production in a lower R:FR light environment.
Scientific Publication
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