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פותח על ידי קלירמאש פתרונות בע"מ -
Photo-thermal regulation of seed germination in natural populations of Eruca sativa Miller (Brassicaceae)
Year:
2012
Source of publication :
Journal of Arid Environments
Authors :
אהלי, שחר
;
.
ברזילי, מיכל
;
.
ברזני, עוז
;
.
קוואיה, מ'
;
.
Volume :
85
Co-Authors:
Barazani, O., Institute of Plant Sciences, Israel Plant Gene Bank, Agricultural Research Organization, Bet Dagan 50250, Israel
Quaye, M., Institute of Plant Sciences, Israel Plant Gene Bank, Agricultural Research Organization, Bet Dagan 50250, Israel, Institute of Plant Sciences and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
Ohali, S., Institute of Plant Sciences, Israel Plant Gene Bank, Agricultural Research Organization, Bet Dagan 50250, Israel
Barzilai, M., Institute of Plant Sciences, Israel Plant Gene Bank, Agricultural Research Organization, Bet Dagan 50250, Israel
Kigel, J., Institute of Plant Sciences and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
Facilitators :
From page:
93
To page:
96
(
Total pages:
4
)
Abstract:
Populations of the winter annual Eruca sativa in Israel are distributed along a climatic gradient, from Mediterranean mesic habitats in the north to semi-arid and arid habitats in the south. Seed cohorts of five populations sampled across the gradient were produced in a common-garden experiment, and their germination was tested under continuous light or darkness at 5-35 °C, as well as with alternating 30/20 and 25/15 °C temperatures under a 12/12 h photoperiod. Germination was enhanced by light and by increasing temperature. Under constant temperatures maximal germination of arid and semi-arid populations was lower than in the mesic populations, suggesting on higher levels of primary dormancy with increasing aridity. Seeds that did not germinate in darkness or at low temperatures in light, germinated almost fully when exposed to GA 3 at 25 °C, indicating that imbibition under less favorable conditions induces secondary dormancy in E. sativa. Daily alternating temperatures did not affect or even reduced seed germination compared to constant 25 and 30 °C in continuous light. Exposure of dry seeds to 30 °C before imbibition increased germination to ≥80% in seed cohorts of all populations. These responses to light and temperature indicate that adaptation of E. sativa to the Mediterranean environment is associated with the ability to germinate under the relatively warm autumn temperatures, and is enhanced by exposure to high temperature during the dry summer. © 2012 Elsevier Ltd.
Note:
Related Files :
Brassicaceae
dormancy
Eruca sativa
germination
Israel
light
Light intensity
temperature
temperature effect
עוד תגיות
תוכן קשור
More details
DOI :
10.1016/j.jaridenv.2012.06.011
Article number:
Affiliations:
Database:
סקופוס
Publication Type:
מאמר
;
.
Language:
אנגלית
Editors' remarks:
ID:
24317
Last updated date:
02/03/2022 17:27
Creation date:
17/04/2018 00:06
Scientific Publication
Photo-thermal regulation of seed germination in natural populations of Eruca sativa Miller (Brassicaceae)
85
Barazani, O., Institute of Plant Sciences, Israel Plant Gene Bank, Agricultural Research Organization, Bet Dagan 50250, Israel
Quaye, M., Institute of Plant Sciences, Israel Plant Gene Bank, Agricultural Research Organization, Bet Dagan 50250, Israel, Institute of Plant Sciences and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
Ohali, S., Institute of Plant Sciences, Israel Plant Gene Bank, Agricultural Research Organization, Bet Dagan 50250, Israel
Barzilai, M., Institute of Plant Sciences, Israel Plant Gene Bank, Agricultural Research Organization, Bet Dagan 50250, Israel
Kigel, J., Institute of Plant Sciences and Genetics in Agriculture, Robert H. Smith Faculty of Agriculture, Food and Environment, The Hebrew University of Jerusalem, Rehovot, Israel
Photo-thermal regulation of seed germination in natural populations of Eruca sativa Miller (Brassicaceae)
Populations of the winter annual Eruca sativa in Israel are distributed along a climatic gradient, from Mediterranean mesic habitats in the north to semi-arid and arid habitats in the south. Seed cohorts of five populations sampled across the gradient were produced in a common-garden experiment, and their germination was tested under continuous light or darkness at 5-35 °C, as well as with alternating 30/20 and 25/15 °C temperatures under a 12/12 h photoperiod. Germination was enhanced by light and by increasing temperature. Under constant temperatures maximal germination of arid and semi-arid populations was lower than in the mesic populations, suggesting on higher levels of primary dormancy with increasing aridity. Seeds that did not germinate in darkness or at low temperatures in light, germinated almost fully when exposed to GA 3 at 25 °C, indicating that imbibition under less favorable conditions induces secondary dormancy in E. sativa. Daily alternating temperatures did not affect or even reduced seed germination compared to constant 25 and 30 °C in continuous light. Exposure of dry seeds to 30 °C before imbibition increased germination to ≥80% in seed cohorts of all populations. These responses to light and temperature indicate that adaptation of E. sativa to the Mediterranean environment is associated with the ability to germinate under the relatively warm autumn temperatures, and is enhanced by exposure to high temperature during the dry summer. © 2012 Elsevier Ltd.
Scientific Publication
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