Tolerância de sementes de linhagens de milho à alta temperatura de secagem

José, Solange Carvalho Barrios Roveri; Pinho, Édila Vilela de Resende Von; Pinho, Renzo Garcia Von; Silveira, César Martoreli da

doi:10.1590/s1413-70542004000500019

Cited by 6 publications

(2 citation statements)

References 15 publications

(9 reference statements)

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“…In general, the results of the germination of the hybrids were higher than those observed in seeds of the lines (Table 4). These results are in accordance with several studies in which heterosis was observed in germination and seed vigor [15][16][17][18][19].…”

Section: Discussionsupporting

confidence: 93%

Gene expression and genetic control to cold tolerance during maize seed germination

Neta¹,

Pinho

Abreu³

et al. 2020

BMC Plant Biol

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Background: The study of cold tolerance in maize seeds and seedlings through physiological quality assessments, as well as the genetic control associated with this trait, allows an early characterization of genotypes. Here we studied the genetic control for cold tolerance during the germination process in maize seeds and genes influenced by this stress. Results: Six maize lines were used, three classified as tolerant and three as susceptible to low germination temperature. A field was developed to produce the hybrid seeds, in a partial diallel scheme including the reciprocal crosses. For the expression analysis, seeds from two contrasting lines were used, as well as their hybrid combination and their reciprocal crosses, on dried and moistened seeds at 10°C for 4 and 7 days. It was evaluated the catalase (CAT) and esterase (EST) enzymes, heat-resistant proteins and the genes Putative stearoyl-ACP desaturase (SAD), Ascorbate Peroxidase (APX), Superoxide Dismutase (SOD) and Mitogen Activated Protein Kinase (ZmMPK5). The estimated values for heterosis, general and specific combining abilities and reciprocal maternal and non-maternal effects were carried out and it showed that there is heterosis for germination at low temperatures, also the nonadditive genes were more important and there was a reciprocal effect. Conclusions: There is a greater expression of the CAT and EST enzymes in moistened seeds at seven days and there is less expression of heat-resistant proteins and the SAD gene at seven days of moistening. Also, there are variations in the expression of the APX, SOD and ZmMPK5 genes in dried and moistened seeds, as well as among the genotypes studied.

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Section: Discussionsupporting

confidence: 93%

Gene expression and genetic control to cold tolerance during maize seed germination

Neta¹,

Pinho

Abreu³

et al. 2020

BMC Plant Biol

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“…In maize, seed susceptibility to damage by high drying temperature is associated with a maternal effect and depends on the genotype (José et al, 2004a). Structural and biochemical traits in seeds have been combined in the acquisition and maintenance of desiccation tolerance (Golovina et al, 2001;halperin and Koster, 2006).…”

Section: Introductionmentioning

confidence: 99%

Mapping of quantitative trait locus associated with maize tolerance to high seed drying temperature

Salgado

Pinho²,

Guimarães³

et al. 2008

Genet. Mol. Res.

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ABSTRACT. quantitative trait locus (qTL) mapping and identification of traits of agronomic importance is important in the process of molecular marker-assisted selection in breeding programs. The molecular map of maize is well saturated and qTL and simple sequence repeat (SSR) markers have been identified, whereas few markers linked to seed quality traits are included. The present study aimed to identify QTL and the gene action and to quantify the effects of these regions in the phenotypic variation related to maize tolerance to high seed drying temperature. SSR markers and 129 segregating families of F 2 plants of the cross of intolerant and tolerant lines were used in regression and composite interval mapping methods. Three maize QTL associated with tolerance to high seed drying temperature were identified and mapped to chromosomes 6 and 8, explaining 39% of the phenotypic variation of the trait with additive, dominance and overdominance gene action. These markers seem to be effectively associated with the evaluated trait, since all were mapped near genes whose expression products were associated with seed desiccation tolerance.

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Aspectos químicos e estruturais da qualidade fisiológica de sementes de soja

Menezes

Pinho

José

et al. 2009

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar os efeitos gênicos aditivos e não aditivos para as características da espessura das camadas da testa e da lignina presente nessas camadas, e verifi car se os caracteres utilizados para avaliação da qualidade fi siológica das sementes de soja se correlacionam com o teor de lignina do tegumento. Foram usadas três cultivares (M-Soy 8400, CD 201, CD 206) de alta e três (CD 215, CD 202, Savana) de baixa qualidade fi siológica, para se obterem sementes híbridas F 1 e F 2 , inclusive os recíprocos, pelo sistema de cruzamento dialelo parcial e as linhagens parentais. Os parâmetros primeira contagem de germinação, contagem fi nal de germinação e velocidade de germinação, utilizados para avaliação da qualidade fi siológica, podem ser correlacionados com o teor de lignina. Foram observadas correlações positivas entre o teor de lignina e a percentagem de plântulas normais no teste de envelhecimento ao 5 o e 11 o dias após a semeadura, com valores maiores de correlação no 5 o dia. A correlação entre velocidade de germinação e teor de lignina foi negativa. A análise do dialelo apontou signifi cância do efeito recíproco, o que indica que a espessura das camadas da testa e a espessura de lignina nessas camadas podem ser explicadas pelo efeito materno.Termos para indexação: Glycine max, cruzamento dialélico, lignina, tegumento. Chemical and structural aspects of the physiological quality of soybean seedsAbstract -The objective of this work was to evaluate the additive and non-additive genetic effects for thickness of the seed coat layers and of the lignin present in them, and to verify if the characters used to evaluate the physiological quality of the seeds is correlated with the lignin content. Three cultivars (M-Soy 8400, CD 201, CD 206) with high and three (CD 215, CD 202, Savana) with low physiological quality were used to obtain F 1 and F 2 hybrid seeds, including the reciprocals, using partial diallel crosses and the parental lines. First germination count, fi nal germination count and germination rate, used to evaluate the physiological quality, can be correlated with lignin content. Positive correlations were observed between lignin content and the percentage of normal seedlings in the aging test at the 5 th and 11 th days after sowing, with the highest correlation values at the 5 th day. The correlation between germination rate and lignin content was negative. The diallel analysis showed reciprocal effect, showing that the thickness of the seed coat layers and of the lignin contained in these layers can be explained by maternal effect.Index terms: Glycine max, diallel cross, lignin, seed coat. IntroduçãoA qualidade fi siológica de sementes de soja é em grande parte infl uenciada pelo genótipo. Nos últimos anos, os programas de melhoramento genético têm buscado desenvolver materiais com características como resistência a doenças e pragas, teores de óleo e proteína e, mais recentemente, teor de lignina no tegumento das sementes (Costa et al., 2001).Em algumas pesquisas, tem s...

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Tolerância de sementes de linhagens de milho à alta temperatura de secagem

Cited by 6 publications

References 15 publications

Gene expression and genetic control to cold tolerance during maize seed germination

Gene expression and genetic control to cold tolerance during maize seed germination

Mapping of quantitative trait locus associated with maize tolerance to high seed drying temperature

Aspectos químicos e estruturais da qualidade fisiológica de sementes de soja

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