Heterose para Qualidade Fisiológica de Sementes na Obtenção de Híbridos de Milho

Prazeres, Camila Segalla; Coelho, Cileide Maria Medeiros

doi:10.18512/1980-6477/rbms.v15n1p124-133

Cited by 13 publications

(12 citation statements)

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“…It was possible to observe the germination of hybrid seeds, within the test conditions, was higher than their parental, indicating heterosis effect. The heterosis effect, as also observed by Nerling et al (2013) and Prazeres and Coelho (2016). The greater sensitivity observed in VPA2 and HIB2 inbred line in accelerated aging test, may be associated with lower levels of soluble sugars present in seeds (Figure 3d).…”

Section: Resultssupporting

confidence: 60%

Biochemical profiling and its role in physiological quality of maize seeds

2018

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-Viability and vigor of seeds are physiological attributes influenced by a myriad of factors including the genotype. Biochemical profiling of maize seeds and its correlation with their physiological quality is of crucial importance in breeding programs that the aim is seeds of better quality. The main goal of this study was to analyze the genetic diversity among maize inbred lines and evaluate the biochemical components that have an important role in physiological quality of seeds. The seeds of the inbred lines and hybrids were submitted to viability test, vigor by the accelerated aging and cold tolerance, and biochemical profiling (total protein content, soluble proteins, total phosphorus, phytate, inorganic phosphorus, starch and soluble sugars). The genetic divergence between the inbred lines found, prompt us to conclude that genetic gains may exist in association with physiological quality of maize hybrids. Seeds with higher inorganic phosphorus and soluble sugars presented superior physiological quality than seeds with lower levels of those compounds.Index terms: vigor, viability, genetic divergence, stored reserves, Zea mays.Perfil bioquímico e seu papel na qualidade fisiológica de sementes de milho RESUMO -A viabilidade e o vigor de sementes são atributos fisiológicos influenciados por uma série de fatores, incluindo o genótipo. O perfil bioquímico das sementes de milho e sua correlação com a qualidade fisiológica são importantes para programas de melhoamento que objetivam obter sementes de melhor qualidade. O objetivo deste estudo foi analisar a diversidade genética entre as linhagens de milho e avaliar os componentes bioquímicos que têm um papel importante na qualidade fisiológica das sementes. As sementes das linhagens e dos híbridos foram submetidas ao teste de viabilidade, vigor pelo envelhecimento acelerado e tolerância ao frio e a determinação do perfil bioquímico (teor de proteína total, proteínas solúveis, fósforo total, fitato, fósforo inorgânico, amido e açúcares solúveis). A divergência genética encontrada entre as linhagens permite concluir que os ganhos genéticos podem existir em associação com a qualidade fisiológica dos híbridos de milho. As sementes com maior teor de fósforo inorgânico e açúcares solúveis apresentaram qualidade fisiológica superior à das sementes com níveis menores desses compostos.Termos para indexação: vigor, viabilidade, divergência genética, reservas armazenadas, Zea mays.

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Section: Resultssupporting

confidence: 60%

Biochemical profiling and its role in physiological quality of maize seeds

2018

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“…Researches on maize in recent years are usually specific for the relationship between physiological quality and the factors that affect it such as storage components (Nerling et al, 2018;Abreu et al, 2016;Coelho, 2016a), enzymes (Oliveira et al, 2015;Santos et al, 2016;Silva-Neta et al, 2015;Lopes et al, 2017;Diniz et al, 2018), heterosis (Nerling et al, 2013;Oliveira et al, 2015;Coelho, 2016a;Coelho, 2016b;Abreu et al, 2018) and image analysis (Pinto et al, 2015;Dias et al, 2015;Castan et al, 2018;Medeiros et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Seed reserves reduction rate and reserves mobilization to the seedling explain the vigour of maize seeds

2019

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Understanding how the seed reserve dynamics occurs during germination and seedling formation is determinant for advancements on seed technology. The aims of this study were: to verify which accelerated ageing temperature is the most effective to separate the vigour levels of maize seeds and to evaluate the reserves dynamics during germination and seedling formation process. Seven maize cultivars were submitted to the germination rate, accelerated ageing, thousand seed weight, total seedling length, shoot and root length, dry matter of seed and seedling, remaining dry matter in the endosperm, seed reserves reduction rate, conversion efficiency of reserves, reserves mobilization rate to the seedling and energy expenditure using the completely randomized statistical design. The reserves dynamics and seedling formation depends on the genotype and the initial seed vigour. Accelerated ageing at 45 °C for 72 hours is the most efficient combination to segregate vigour levels. Genotypes with higher seed reserve utilisation efficiency have higher vigour, producing seedlings with higher dry matter, higher total, shoot and root length, regardless of seed weight. The two rates evaluated prompt us to conclude that they explain the maize seed vigour and can be used in quality control programs to select high physiological quality cultivars.

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“…The hybrid AP8203 displayed the longest length of the coleoptiles, while the hybrid AP6002 had the longest length of roots. Prazeres and Coelho (2016) state that these differences occur due to heterosis being influenced by the characteristics of their parents. In the evaluation of the hybrids, there were no differences in growth, uniformity, and vigor at 0.0 MPa.…”

Section: Resultsmentioning

confidence: 99%

Antioxidant activity and physiological performance of popcorn seed after saline stress and analysis of seedling images

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Lopes³

et al. 2020

Ciênc. agrotec.

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Salinity influences all germination stages and may adversely affect seedling establishment in the field. The objective of this research was to determine the relationship between the antioxidant activity and the physiological performance of seeds and to verify the efficacy of the imaging analysis of popcorn seedlings after seed exposure to saline stress. A completely randomized design was used that consisted of four replicates in a factorial scheme. This scheme comprised three popcorn hybrids (P618, AP6002, and AP8203) and five saline potential levels (0.0; -0.1; -0.3; -0.6, and -0.9 MPa) that were obtained from KCl solutions of different concentrations. First count germination, germination and seedling vigor classification (strong normal seedlings), and dry mass of seedlings were evaluated to determine the physiological quality of the seed. The images of seedlings were used to evaluate the coleoptile and root lengths, indices of vigor, uniformity, and growth using the Groundeye® software. The activities of the antioxidant enzymes superoxide dismutase (SOD), ascorbate peroxidase (APX), and catalase (CAT) were also determined. Saline stress compromises the physiological quality and antioxidant activity of seeds and the performance of popcorn seedlings. Computerized image analysis using Groundeye® was efficient in evaluating the popcorn seedlings after being subjected to salt stress. Hybrids AP6002 and AP8203 were more tolerant to salt stress than hybrid P618.

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Heterose para Qualidade Fisiológica de Sementes na Obtenção de Híbridos de Milho

Cited by 13 publications

References 0 publications

Biochemical profiling and its role in physiological quality of maize seeds

Biochemical profiling and its role in physiological quality of maize seeds

Seed reserves reduction rate and reserves mobilization to the seedling explain the vigour of maize seeds

Antioxidant activity and physiological performance of popcorn seed after saline stress and analysis of seedling images

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