Índices de vigor de sementes de milho (Zea mays L.): associação com emergência em campo, crescimento e rendimento de grãos

Duraes, F. O. M.; Chamma, Helena Maria Carmignani Pescarin; D., Costa. J.; Magalhães, P. C.; Borba, C. da S.

doi:10.17801/0101-3122/rbs.v17n1p13-18

Cited by 8 publications

(4 citation statements)

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“…A qualidade das sementes pode influenciar a uniformidade, a velocidade e a porcentagem de emergência em campo, além de apresentar reflexos sobre a produção final (DURÃES et al, 1993).…”

Section: Introductionunclassified

Influência do estresse hídrico sobre o desempenho fisiológico de sementes de híbridos simples de milho-pipoca

et al. 2008

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RESUMOObjetivou-se, neste trabalho, avaliar o efeito do estresse hídrico induzido por polietileno glicol, na qualidade fisiológica das sementes de catorze híbridos simples de milho-pipoca. Para tanto, foi conduzido um experimento em que as sementes foram colocadas para germinar em substrato de papel-toalha, umedecido com soluções de polietileno glicol (PEG 6000), nos níveis de potencial osmótico de zero (controle) e -0,3 MPa. A qualidade fisiológica das sementes foi avaliada por meio do teste de germinação (primeira contagem e contagem final), do comprimento da raiz primária e da parte aérea das plântulas e da biomassa seca das plântulas. A diminuição do potencial hídrico do substrato é prejudicial à germinação das sementes e, principalmente, ao crescimento das plântulas de milho-pipoca. Os decréscimos nas variáveis analisadas dependeram dos híbridos avaliados. Os híbridos G e K foram os que se mostraram mais tolerantes ao estresse hídrico, enquanto que o híbrido M foi mais susceptível à seca. A tolerância ao estresse hídrico independe da qualidade inicial das sementes de milho-pipoca. Termos para indexação:Zea mays, polietileno glicol, híbridos. ABSTRACTThe aim in this work was to evaluate the effect of the water stress induced by polyethylene glycol, in the physiological quality of seeds of fourteen hybrids of popcorn. For this, an experiment was carried out at laboratory in which the seeds were put to germinate in substratum of paper-towel, soaked with solutions of polyethylene glycol (PEG 6000) in the levels of osmotic potential of zero (control) and -0.3 MPa. The physiological quality of the seeds was evaluated through the germination test (first counting and final counting), length of the primary root and aerial part of the seedlings and dry biomass of seedlings. The decrease of the water potential of the substratum is harmful to the germination, mainly to the growth of seedlings of popcorn. The decreases in the analyzed variables depended on the appraised hybrid. The hybrids G and K were the ones that showed to be more tolerant to the water stress, while the one of the hybrid M was more susceptible to the drought. The tolerance to water stress does not depend on the initial quality of the popcorn seeds. Index terms:Zea mays, polyethylene glycol, hybrids. (Recebido em 23 de novembro de 2007 e aprovado em 31 de março de 2008)1 Engenheiros Agrônomos, Doutorandos -Departamento de Agronomia -Programa de Pós-Graduação em Agronomia/PGA -Universidade Estadual de Maringá/UEM -Avenida Colombo, Zona 7 -Cx. P. 5790 -87020-900 -Maringá, PR -lmoterle@hotmail.com; marcos_rodovalho@yahoo.com.br 2 Engenheiros Agrônomos, Doutores, Professores Associado -Departamento de Agronomia -Programa de Pós-Graduação em Agronomia/PGAUniversidade Estadual de Maringá/UEM -Avenida Colombo, Zona 7 -Cx. P. 5790 -87020-900 -Maringá, PR -cascapim@uem.br; albraccini@uol.com.br 3 Engenheiro Agrônomo, Mestre -Cooperativa Central de Pesquisa Agrícola/COODETEC -Br 467, Km 98 -Cx. P. 301 -85818-660 -Cascavel, PRrrbarreto@hotmail.com INTRODUÇÃOExis...

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Section: Introductionunclassified

Influência do estresse hídrico sobre o desempenho fisiológico de sementes de híbridos simples de milho-pipoca

et al. 2008

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“…Seeds are one of the main inputs of agriculture, being a determining factor for the success or failure of the crop implantation (Costa & Campos, 1997). Its quality is what determines the uniformity, speed, and percentage of emergence in the field, reflecting on the final yield (Durães et al, 1993).…”

Section: Introductionmentioning

confidence: 99%

Effect of Soil Temperature in the Emergence of Maize Seeds

Santos¹,

Vasconcellos²,

Pauli³

et al. 2018

JAS

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Temperature is one of the most important factors in the germination process, which influences the absorption of nutrients required for growth and development of the plant, germination uniformity, and seed vigor maintenance. Low temperatures can result in deformation of the leaves and the apex of the plant, and high temperatures hamper the development of them. The objective of this work was to evaluate the ideal temperature values for germination in each genetic material used, highlighting the most suitable for each condition. The experiment was conducted at the Central Seed Laboratory at the Department of Agriculture of the Lavras Federal University, where germination percentage, first germination count, seedling emergence and emergence speed were evaluated. The experimental design was completely randomized, with a factorial scheme of 4 × 5, in which it was analyzed four lines (L30, L64, L63, and L91) at five different germination temperatures (15, 20, 25, 30 and 35 ºC). An analysis of variance was done and for the comparison between means, the Scott Knott test was used, at a 5% probability. It can be observed that the lines L63 and L91 were more susceptible to low germination temperatures and lines L30 and L64 do not tolerate high temperatures. Also, the evaluation of temperature-controlled substrate germination proved to be a promising technique to identify tolerant and susceptible lines for germination in both high and low temperatures.

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“…Among the abiotic stresses, drought is one of the major sources of grain yield instability of maize in tropical regions. DuPlessis and Dijkhuis (1967), Hall et al (1982), Bolaños and Edmeades (1993), Durães et al (1993Durães et al ( , 1994Durães et al ( , 1997Durães et al ( , 1999Durães et al ( , 2000aDurães et al ( , 2000b showed that when the drought stress occurs during flowering, the losses in grain yield can be higher than 50%. These losses may be a consequence of the reduction in the number of seeds set per plant due to flowering inhibition, failure in the fertilization and abortion of embryos (Westgate, 1986).…”

Section: Introductionmentioning

confidence: 99%

Combining ability of tropical maize inbred lines under drought stress conditions

Ozanan¹,

Durães

Magalhães

et al. 2002

CBAB

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Among the environmental stresses, drought is considered the main source of maize grain yield instability in tropical areas. Anthesis-silking interval (ASI) is used as an efficient phenotypic index for water stress tolerance and has also been used in breeding programs aiming to increase yield stability under water stress. This phenotypic index is also an important tool to be used in cultivar development, in relation to the emergence of silk hairs, since the ASI is totally independent from the differences in genotype cycles. The objective of this study was to evaluate the genetic potential of six maize inbred lines from the Embrapa Maize and Sorghum breeding program, selected for drought tolerance by using grain yield. The F 1 's and reciprocals from a diallel crosses, plus three hybrids checks, were evaluated under two irrigated systems: well-watered conditions during all growth stage and water-stressed conditions where irrigation was suppressed during the flowering period. The means over the checks were 15% and 5% higher than the means of all F 1 's hybrids in the experiments under non-stress and stress conditions, respectively. Under water-stressed conditions, yield means were 45.6% and 40.4% low for the checks and F 1 's, respectively, when compared to well-watered condition. The results for mean grain yield showed a great potential for the genetic material used in the ecological condition studied. Under well-watered conditions, the F1's L1147 x L10.1.1; L6.1.1 x L8.3.1 and L1147 x L13.1.2 and the reciprocal cross L13.1.2 x L1147 presented the highest specific combining ability effect values. For both conditions, general combining ability effects of the inbred line L6.1.1 showed the highest value and the inbred lines L10.1.1 and L1147 the lowest ones. Under water stress, the specific combining ability effects were not significant among F 1 's and reciprocals, indicating similar performances for crossing combinations among the evaluated lines. The grain yield means of the checks were similar to the means of the F 1 's in both environments. Among the hybrid checks, the single cross presented a higher grain yield than the three-way and double-crosses hybrids, in both well-watered and under water-stress conditions.

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Índices de vigor de sementes de milho (Zea mays L.): associação com emergência em campo, crescimento e rendimento de grãos

Cited by 8 publications

References 0 publications

Influência do estresse hídrico sobre o desempenho fisiológico de sementes de híbridos simples de milho-pipoca

Influência do estresse hídrico sobre o desempenho fisiológico de sementes de híbridos simples de milho-pipoca

Effect of Soil Temperature in the Emergence of Maize Seeds

Combining ability of tropical maize inbred lines under drought stress conditions

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