Desenvolvimento vegetativo e reprodutivo de cultivares de trigo e sua associação com a emissão de folhas

Walter, Lidiane Cristine; Streck, Nereu Augusto; Rosa, Hamilton Telles; Alberto, Cleber Maus; Oliveira, Felipe Brendler

doi:10.1590/s0103-84782009005000169

Cited by 10 publications

(9 citation statements)

References 8 publications

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“…The duration of the total development cycle of wheat cultivars is directly related to the duration of the vegetative phase rather than the reproductive phase (Walter et al, 2009). This finding was also reported by Machado et al (2010), who did not observe differences among the temperature means in the reproductive phase, considering two sowing periods (summer and winter).…”

Section: Resultssupporting

confidence: 82%

Potential of F3:4 Segregating Wheat Populations for Tolerance to Heat Stress

Ribeiro

Pimentel

Rocha

et al. 2019

Rev. Agric. Neotrop.

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Heat is one of the major abiotic stresses that affect wheat yield and quality in many parts of the world. To overcome this problem, the development of heat tolerant cultivars has been shown to be one of the main targets of breeding programs, especially for the conditions of Central Brazil. The present study was developed with objective of identifying promising populations for tolerance to heat stress, in order to obtain lines adapted to the conditions of Central Brazil. The experiment was carried out in the summer of 2011 in Coimbra/MG where 36 segregating populations with different numbers of families per population were evaluated in an augmented block design, determining the cycle, plant height and grain yield. Genetic variability for heat tolerance was observed among the wheat populations. The vegetative development stage of wheat was more sensitive to the effect of heat stress. The most promising segregating populations were IAC364/BRS207, IAC24/Aliança IAC24/Pioneiro that associated high yield with a large number of families selected among the most productive, demonstrating the possibility of selecting heat stress-tolerant lines.

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Section: Resultssupporting

confidence: 82%

Potential of F3:4 Segregating Wheat Populations for Tolerance to Heat Stress

Ribeiro

Pimentel

Rocha

et al. 2019

Rev. Agric. Neotrop.

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“…As análises de variância (Tabela 1) mostraram efeitos significativos da interação cultivar x data de semeadura para as variáveis NFF (Tabela 2 (STRECK et al, 2006;STRECK et al, 2009;WALTER et al, 2009).…”

Section: Resultsunclassified

“…Essa grande variação no NFF devido aos diferentes genótipos e as diferentes datas de semeadura fornece um amplo e apropriado conjunto de dados para o teste da hipótese deste estudo, que foi de que o HS pode ser usado como indicador morfológico das plantas para Com relação ao HS DA entre as cultivares, esta variável sempre foi maior na BRS Tarumã, cultivar mais tardia, onde variou de 9,82 a 18,13 folhas, e menor nas duas cultivares mais precoces (BRS Louro e CEP 52), onde variou de 4,20 a 7,28 folhas (Tabela 4). Nas datas de semeadura em que não há dados da cultivar BRS Tarumã, o maior HS DA médio foi na cultivar Nova Era (7,27 folhas), a qual também é classificada como menos tardia que a BRS Tarumã (WALTER et al, 2009 † Não foi realizada a análise estatística na interação cultivar dentro das datas de semeadura pois apenas uma repetição.…”

Section: Resultsunclassified

Número de folhas associado com duplo anel e espigueta terminal em cultivares de trigo

et al. 2012

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RESUMO -O objetivo deste trabalho foi determinar o número de folhas, representado pelo Estágio de Haun, no duplo anel e na espigueta terminal de cultivares de trigo com diferentes ciclos de desenvolvimento e cultivados em diferentes datas de semeadura. Um experimento de campo foi realizado em Santa Maria, RS, com 13 datas de semeadura ao longo de três anos (2005; 2006 e 2007). Foram utilizados seis genótipos de trigo com ciclos de desenvolvimento variando de precoce a tardio: BRS Louro, CEP 52, BRS 177, CEP 51, Nova Era e BRS Tarumã. O delineamento experimental utilizado foi blocos completos casualizados, com seis tratamentos (cultivares) e quatro repetições. Foram determinados os estágios início do perfilhamento, duplo anel (DA), espigueta terminal (ET) e o número final de folhas no colmo principal (NFF) e na data em que ocorreu o DA e a ET foi quantificado o número de folhas totalmente expandidas mais a fração decimal do comprimento da lâmina foliar da última folha (em expansão) em relação à penúltima folha (expandida), com os quais foi calculado o Estágio de Haun (HS). Os resultados indicam que o número de folhas no colmo principal, representado pelo HS, no duplo anel (HS DA ) e na espigueta terminal (HS ET ) em trigo, varia com a cultivar (grupo de maturação) e com a data de semeadura. Práticas de manejo como a adubação nitrogenada e a aplicação de herbicidas hormonais podem ser melhoradas usando-se o HS DA e HS ET ao invés do início do perfilhamento e elongação do colmo, respectivamente. Palavras-chave:Trigo-adubação nitrogenada. Semeadura. Herbicidas. ABSTRACT -The objective of this study was to determine the number of leaves, represented by the Haun stage, in the double ridge and terminal spikelet of wheat cultivars with different development cycles and grown on different sowing dates. A field experiment was conducted in Santa Maria, RS with 13 sowing dates over three years (2005, 2006 and 2007). Six wheat genotypes were used with development cycles ranging from early to late: BRS Louro, CEP 52, BRS 177, CEP 51, Nova Era and BRS Tarumã. The experimental design used was of randomized complete blocks, with six treatments (cultivars) and four repetitions. The early stages of tillering, double-ridging (DA), terminal spikelet (ET) and the final number of leaves on the main stem (NFF) were determined, and on the date of DA and ET, the number of fully expanded leaves was quantified together with the decimal fraction of the length of the leaf blade of the last leaf (unfolded) in relation to the penultimate leaf (unfolding), with which the Haun Stage (HS) was calculated. The results indicate that the number of leaves on the main stem, represented by HS, in the double ridge (HS DA ) and in the terminal spikelet (HS ET ) in wheat, varies with the cultivar (maturity group) and the date of sowing. Management practices such as fertilization with nitrogen and the application of hormonal herbicides can be improved by using the HS DA and HS ET, instead of the onset of tillering and stem elongation, respectively.

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“…The increase was also observed in BRS Umbu genotype, with higher plant densities in managements with two and three cuts, showing maintenance of LAF in managements without cut and with one cut. Possibly the leaf area increasing is linked to the higher number of leaves on the main stem or its greatest expansion of leaf blade (Walter et al, 2009). Regarding to BRS 277 genotype, there is increase in magnitude of LAF in the management of two cuts and three cuts in higher densities, and at the management without cut in lower densities.…”

Section: Leaf Area At Floweringmentioning

confidence: 98%

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2018

Aust J Crop Sci

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The aim of this study was to assess the performance of leaf area during the development of dual purpose wheat genotypes when subjected to different seeding densities and defoliation managements. The experiment was conducted in 2014 growing season in experimental area belonging to the Breeding Lab and Plant Production of the Federal University of Santa Maria Campus Frederico Westphalen-RS. The experimental design was a randomized complete block in a factorial treatment design, as follows: five genotypes (BRS Figueira, BRS Guatambu, BRS Tarumã, BRS Umbu and BRS 277) × five seeding densities (75; 150; 225; 300; 375 plant m-2) × four defoliation managements (without cut. one cut. two cuts and three cuts) arranged in three replications. The cuts were made when the plants reached 30 cm, leaving 10 cm for regrowth. Leaf area is influenced by defoliation management seeding densities and dual purpose wheat genotype. Increased in seeding density reduces leaf area in all genotypes. The larger leaf area at tillering was obtained at the density of 300 plant m-2 to management with three cuts for the genotypes BRS Tarumã, BRS Umbu, Guatambu BRS and BRS Figueira. The density of 300 plant m-2 provide increase on leaf area in flowering stage for BRS Umbu, BRS Guatambu and BRS 277 genotypes in all defoliation managements. Leaf area reduces in the grain filling when seeding density is increased for all defoliation managements in the genotypes BRS Tarumã, BRS Umbu and BRS 277.

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Desenvolvimento vegetativo e reprodutivo de cultivares de trigo e sua associação com a emissão de folhas

Abstract: Desenvolvimento vegetativo e reprodutivo de cultivares de trigo e sua associação com a emissão de folhas

Cited by 10 publications

References 8 publications

Potential of F3:4 Segregating Wheat Populations for Tolerance to Heat Stress

Potential of F3:4 Segregating Wheat Populations for Tolerance to Heat Stress

Número de folhas associado com duplo anel e espigueta terminal em cultivares de trigo

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