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Title: 
O modelo 'hydrotime' pode descrever a resposta de sementes de feijão comum (phaseolus vulgaris l.) à temperatura e potenciais de água reduzidos
Other Titles: 
Hydrotime model can describe the response of common bean (Phaseolus vulgaris L.) seeds to temperature and reduced water potential
Author(s): 
Institution: 
Universidade Estadual Paulista (UNESP)
ISSN: 
  • 1679-9283
  • 1807-863X
Abstract: 
Germination parameters of the response to temperature and water potential from four common bean (Phaseolus vulgaris) lines based on thermal-time and hydrotime concepts were estimated to verify to what extent they can predict germination under different thermal and water conditions. The cultivars IPR Uirapuru and IAPAR 81 (drought-tolerant), and Grauna and Carioca (not tolerant) were used. The isothermal assays were performed in a temperature gradient block, and the assays with different osmotic potentials (PEG 6000) were performed in germination chambers. Seeds from drought-tolerant cultivars spent less time to germinate at supra-optimum temperatures than non-tolerant ones, and the cultivar Uirapuru (drought-tolerant) germinated faster in response to reduced Ψ and low temperatures. The parameter Ψb(50) did not discriminate between drought-tolerant and non-tolerant lines at the infraoptimum temperature range, but it can be used to identify drought-tolerant lines at high temperatures. In general, the hydrotime model reproduced the actual germination data relatively well, chiefly at higher temperatures. This study evidenced that the hydrotime model can be used to describe the germination of common bean seeds under reduced water potentials, and as a screening tool for drought-tolerant bean genotypes.
Issue Date: 
13-May-2013
Citation: 
Acta Scientiarum - Biological Sciences, v. 35, n. 2, p. 255-261, 2013.
Time Duration: 
255-261
Keywords: 
  • Carioca
  • Germination
  • Grauna
  • Iapar 81
  • Model
  • Uirapuru
  • macrogol 6000
  • water
  • cultivar
  • density gradient
  • drought tolerance
  • genotype
  • germination
  • high temperature
  • hydrotime
  • low temperature
  • mass
  • nonhuman
  • osmotic potential
  • Phaseolus vulgaris
  • plant seed
  • seed imbibe
  • seed mass
  • seed viability
  • temperature
  • thermal time
Source: 
http://dx.doi.org/10.4025/actascibiolsci.v35i2.15393
URI: 
Access Rights: 
Acesso aberto
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/75389
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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