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Registros recuperados: 3
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Base temperature for leaf appearance and phyllochron of selected strawberry cultivars in a subtropical environment Bragantia
Rosa,Hamilton Telles; Walter,Lidiane Cristine; Streck,Nereu Augusto; Andriolo,Jerônimo Luiz; Silva,Michel Rocha da; Langner,Josana Andréia.
Leaf development is characterized by the appearance of new leaves and is related to crop leaf area index, which affects the interception of solar radiation used for photosynthesis and biomass production and ultimately defines crop yield. The objectives of this paper were to estimate the base temperature for leaf appearance and to determine the phyllochron of two strawberry cultivars considering several planting dates. A two-year field experiment was conducted during 2008 and 2009 in Santa Maria (RS). The cultivars Arazá (early) and Yvapitá (late) were used at three planting dates in both years. Base temperature (Tb) was estimated using the Mean Square Error (MSE) approach of the regression between accumulated leaf number (LN) and accumulated thermal time...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fragaria x ananassa; Leaf development; Plant development; Temperature; Thermal time.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0006-87052011000400029
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Leaf development and growth of selected sugarcane clones in a subtropical environment PAB
Streck,Nereu Augusto; Hanauer,Joana Graciela; Gabriel,Luana Fernandes; Buske,Taise Cristine; Langner,Josana Andréia.
The objective of this work was to compare phyllochron and leaf area on individual stalks of selected sugarcane (Saccharum officinarum) clones grown in a subtropical environment. A two-year field experiment was carried out in Santa Maria, RS, Brazil, during the 2007/2008 and 2008/2009 growing seasons. Three sugarcane clones were used: IAC 822045 (early), SP 711406 (median) and CB 4176 (late), in a complete randomized block design, with four replications. Expanded leaf and total leaf (tips) number were determined, and expanded leaf area was measured. The phyllochron (ºC day leaf-1) based on expanded and tip leaf number was estimated, using 10ºC as base temperature. Allometric relationships between individual area and number of expanded leaves were fitted....
Tipo: Info:eu-repo/semantics/article Palavras-chave: Saccharum officinarum; Allometric relationships; Biofuel; Leaf area; Leaf number.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010001000001
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Maize leaf development under climate change scenarios PAB
Streck,Nereu Augusto; Langner,Josana Andréia; Lago,Isabel.
The objective of this work was to simulate maize leaf development in climate change scenarios at Santa Maria, RS, Brazil, considering symmetric and asymmetric increases in air temperature. The model of Wang & Engel for leaf appearance rate (LAR), with genotype-specific coefficients for the maize variety BRS Missões, was used to simulate tip and expanded leaf accumulated number from emergence to flag leaf appearance and expansion, for nine emergence dates from August 15 to April 15. LAR model was run for each emergence date in 100-year climate scenarios: current climate, and +1, +2, +3, +4 and +5°C increase in mean air temperature, with symmetric and asymmetric increase in daily minimum and maximum air temperature. Maize crop failure due to frost...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Zea mays; Elevated temperature; Frost risk; Global warming; Leaf appearance; Vegetative development.
Ano: 2010 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2010001100001
Registros recuperados: 3
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