| Registro completo |
| Provedor de dados: |
Ciência Rural
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| País: |
Brazil
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| Título: |
Anatomical and physiological characteristics of two argentine wheat cultivars
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| Autores: |
Filgueira,Raúl Roberto
Golik,Inés Silvina
Sarli,Oliverio Guillermo
Jatimliansky,Raúl Jaime
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| Data: |
2003-08-01
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| Ano: |
2003
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| Palavras-chave: |
Specific leaf area
Mesophyll area
Carbon dioxide exchange
Transpiration
Leaf anatomy
Conductance
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| Resumo: |
Two Argentine field grown wheat cultivars (Triticum aestivum L.), Buck Cencerro (BC) with traditional germoplasm, and Buck Pucará (BP) with Mexican germoplasm, have been investigated in order to compare anatomical and physiological characteristics of the flag leaf measured in heading (stage E59), anthesis (stage E69) and kernel water ripe (stage 71). In both cultivars, photosynthetic rate was not different for the same phenological stage, except for E71. Averages in stage E59 were higher than stages E69 and E71 for both cultivars (22.70, 18.40 and 10.40 µmol m-2 s-1 for BP and 23.82, 18.41 and 8.28 µmol m-2 s-1 for BC, respectively). Transpiration rates were higher in BP (5.0, 5.6 and 4.89 mmol m-2 s-1) than BC (3.3, 4.4 and 2.57 mmol m-2 s-1) for stages E59, E69 and E71, respectively. Consequently, instantaneous water use efficiencies were higher in BC than in BP. No difference between cultivars and phenological stages was observed in specific surface area (mesophyll area per unit mass) determined by physical adsorption of nitrogen at low temperature (78° K); the mean was 8.9 m² g-1. It was similar as values found in previous works, in others T. aestivum L. and greater than the values found for Ligustrum lucidum Aiton, by the same technique. Differences could be attributed to the roughness of the cell wall and the dimensions of the cell itself. No positive correlation between specific surface and photosynthetic rate was observed neither for cultivars nor for phenological stages.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0103-84782003000400008
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| Editor: |
Universidade Federal de Santa Maria
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| Relação: |
10.1590/S0103-84782003000400008
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| Formato: |
text/html
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| Fonte: |
Ciência Rural v.33 n.4 2003
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| Direitos: |
info:eu-repo/semantics/openAccess
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