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| DOI: | 10.1093/aob/mc1021 |
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| Web URL(s): | https://academic.oup.com/aob/article/97/4/659/187061/
Last checked: 03/01/2017
Requires: PDF Reader |
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| Publication Type:
| Refereed |
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| Author(s): | Ofir, Micha;
Kigel, Jaime |
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| Title: | Opposite effects of daylength and temperature on flowering and summer dormancy of Poa bulbosa |
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| Source: | Annals of Botany. Vol. 97, No. 4, April 2006, p. 659-666. |
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| Publishing Information: | London, Oxford University Press |
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| # of Pages: | 8 |
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| Keywords: | TIC Keywords: Photoperiod; Temperatures; Flowering; Summer dormancy; Poa bulbosa; Vernalization; Aridity; Ecotypes
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| Abstract/Contents: | "Background and Aims The timing of flowering and summer induction plays a central role in the adaptation of Mediterranean geophytes to changes in the length of the growth season along rainfall gradients. Our aim was to analyse the role of variation in the responses of flowering and summer dormancy to vernalization, daylength and growth temperature for the adaptation of Poa bulbosa, a perennial geophytic grass, to increasing aridity. Methods Flowering and dormancy were studied under controlled daylength [9h short day (SD) vs. 16h long day (LD)] and temperatures (16/10, 22/16 and 28/22 °C day/night) in four ecotypes originating in arid, semi-arid and mesic habitats (110, 276 and 810 mm rain year-1, respectively) and differing in flowering capacity under natural conditions: arid-flowering, semi-arid-flowering, semi-arid-non-flowering and mesic-non-flowering. Key results Flowering and dormancy were affected in opposite ways by daylength and growth temperature. Flowering occured almost exclusively under SD. In contrast, plants became dormant much earlier under LD than under SD. In both daylengths, high temperature and pre-chilling (6 weeks at 5 °C) enhanced dormancy imposition, but inhibited or postponed flowering, respectively. Induction of flowering and dormancy in the different ecotypes showed differential responsiveness to daylength and temperature. Arid and semi-arid ecotypes had a higher proportion of flowering plants and flowering tillers as well as more panicles per plants than mesic ecotypes. 'Flowering' ecotypes entered dormancy earlier than 'non-flowering' ecotypes, while the more arid the site of ecotype origin, the earlier the ecotype entered dormancy. Conclusions Variation in the flowering capacity of ecotypes differing in drought tolerance was interpreted as the result of balanced opposite effects of daylength and temperature on the flowering and dormancy processes." |
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| Language: | English |
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| References: | 18 |
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| Note: | Tables
Graphs |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Ofir, M., and J. Kigel. 2006. Opposite effects of daylength and temperature on flowering and summer dormancy of Poa bulbosa. Ann. Bot. 97(4):p. 659-666. |
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| DOI: 10.1093/aob/mc1021 |
| Web URL(s):
https://academic.oup.com/aob/article/97/4/659/187061/
Last checked: 03/01/2017
Requires: PDF Reader |
| 
MSU catalog number: QK 1 .A53 |
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