Comportamento germinativo de sementes de cultivares de milho sob condições de hipoxia

Gazola, Diego; Zucareli, Claudemir; Camargo, Mauro César

doi:10.15361/1984-5529.2014v42n3p224-232

Cited by 10 publications

(11 citation statements)

References 7 publications

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“…Hence, although there may have been a reduction in the percentage of normal seedlings, this reduction was not extremely negative. This corroborates the results obtained by Gazola et al (2014), who verified that variations in the periods of hypoxia (32 and 49 hours) were beneficial to the increase of the percentage of normal seedlings in the first germination count of maize seeds.…”

supporting

confidence: 92%

“…Many studies have shown changes in germination percentage and in the initial morphophysiological characteristics of several species when subjected to hypoxia, including white oats (Rosa et al, 2015), beans (Custódio et al, 2002;Custódio et al, 2009;Pedó et al, 2017), maize (Dantas et al, 2000;Gazola et al, 2014), and soybean (Gazolla Neto et al, 2012). Moreover, the seed survival rate may show varietal differences after some flooding levels (Gazola et al, 2014;Pedó et al, 2017).…”

Section: Introductionmentioning

confidence: 99%

“…The differentiation between cultivars in the studied variables can be explained by the genetic constitution of each one. Genotypes differ as for their physiological quality, thus expressing quite different results in salt stress conditions (Braccini et al,1996;Moterle et al, 2006;Soares et al, 2015) and in the initial development of seeds under hypoxia conditions (Gazola et al, 2014;Silva et al, 2016).…”

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confidence: 99%

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Physiological potential of soybean seeds under hypoxia and salinity stress

et al. 2019

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Adverse factors affect the physiological performance of soybean seeds during field establishment. This study evaluates the physiological potential of Intacta soybean seeds under hypoxia and salinity stress, by submersion in water using different osmotic potentials. In both situations, three intact soybean cultivars (TMG 7062 IPRO, 63i64 RSF IPRO, 7166 RSF IPRO) were tested in the laboratory. To test the effect of hypoxia, the seeds subjected to the tests were previously immersed in water for periods of 0, 6, 12, 24, and 48 hours. In the evaluation of salinity stress, towel papers were moistened with different solutions of potassium chloride (KCl) (0.0;-0.4;-0.8; and-1.2 MPa). Seed germination and vigor (first germination count, shoot length, primary root length, and seedling dry biomass) were evaluated. Seed germination was negatively affected by the 12-hour period of hypoxia. Cultivars 763i64 and 7166 were more tolerant to hypoxia conditions. Cultivar 7062 was more tolerant to salinity stress. Osmotic potential of-0.4 MPa affected the vigor of soybean seeds. Soybean cultivars showed adaptive differences under hypoxia and salinity stress.

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supporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

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Physiological potential of soybean seeds under hypoxia and salinity stress

et al. 2019

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“…However, for both tests, the treatments that exceeded immersion in water were only KNO 3 at 4% and 2%. The deleterious effect of immersion in water on these variables may have been caused by hypoxia, which compromises cell metabolism and results in loss of the physiological potential and viability of the seeds (Gazola, Zucareli, & Camargo, 2014).…”

Section: Controlsmentioning

confidence: 99%

Potassium nitrate to overcome dormancy of Urochloa humidicola Comum seeds

Pereira

Jeromini

Neves

et al. 2021

Semina: Ciênc. Agrár.

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The main difficulty with propagating Urochloa humidicola Comum is the high percentage of seed dormancy. Thus, the objective of this study was to develop a treatment to overcome seed dormancy and promote seed germination of this species that can be applied at a large scale. This study was conducted in two stages. First, the following treatments were evaluated using one seed lot: control (without treatment), immersion in H2SO4 (98%, 36N) for 10 min, moistening the germination substrate with KNO3 (0.2%) and immersion in KNO3 at concentrations of 0%, 2%, 4%, 6%, and 8% for periods of 12, 24, 36, and 48 h, followed by drying in the shade. In the second stage, three seed lots were evaluated in all of the aforementioned treatments, except for those of immersion in 0% KNO3 and of all concentrations for 36 and 48 h. The seeds were evaluated for water content, germination, percentage of abnormal seedlings, dead and dormant seeds, first count, and average germination time. Immersion in the KNO3 solution was efficient in overcoming dormancy and promoting germination. To be used by companies, the immersion of seeds in a 4% KNO3 solution for 24 h was the most suitable treatment to overcome dormancy and promote the germination of U. humidicola Comum seeds.

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“…Assim, esses altos valores de precipitação pluvial ao longo dos ciclos podem ter interferido nas características morfológicas das plantas de milho, uma vez que o excesso de chuva pode ter ocasionado lixiviação de nutrientes como também falta de oxigênio livre para as plantas (Galon et al, 2010). Gazola et al (2014) e Moterle et al (2006) também observaram que o excesso de chuva pode prejudicar a germinação e as fases de desenvolvimento da cultura do milho, visto que impede a penetração do oxigênio e reduz todo o processo metabólico resultante, ocasionando perdas significativas na produtividade. Além disso, a alta sensibilidade da cultura em um período tão curto, associada à grande variabilidade na distribuição de chuvas durante a estação quente, faz do milho uma cultura altamente suscetível ao fator água.…”

Section: Híbridounclassified

Elementos meteorológicos sobre características morfológicas e produtivas do milho em diferentes épocas de semeadura

Caron¹,

Oliveira²,

Elli³

et al. 2017

Científica

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ResumoO presente trabalho teve por objetivo avaliar a influência dos elementos meteorológicos sobre as características morfológicas e produtivas do milho em diferentes épocas de semeadura. O delineamento experimental utilizado foi o de blocos completos casualizados, em esquema fatorial 2x6, com dois híbridos de milho (Dekalb 240 e Dow AgroSciences 2A106), e seis épocas de semeadura (15-09-2013, 30-09, 15-10, 30-10, 16-11 e 03-12-2013), com três repetições. Avaliaram-se a estatura da planta, o diâmetro de espiga, o comprimento de espiga, o número de fileiras por espiga, o número de grãos por fileira, o diâmetro do sabugo, a massa de mil grãos e a produtividade. Foi realizada a análise de variância e o teste de Tukey para os fatores épocas de semeadura e híbridos. Realizaram-se ainda a correlação de Pearson e o procedimento de seleção de variáveis Stepwise de modelagem de regressão. As características morfológicas e produtivas dos híbridos de milho são influenciadas pelos elementos meteorológicos nas diferentes épocas de semeadura. De maneira geral, tanto o híbrido D240 como o 2A106 apresentam melhores resultados em relação às variáveis analisadas, nas semeaduras realizadas em 15-09 e 30-09. Semeaduras tardias (16-11 e 03-12) afetam negativamente o desempenho dos caracteres produtivos e morfológicos dos híbridos. Entre os elementos meteorológicos estudados, a temperatura mínima apresenta a maior contribuição para os valores de produtividade. Palavras-chave adicionais: delineamento experimental; variáveis meteorológicas; Zea mays. AbstractThis study aimed to evaluate the influence of meteorological parameters on morphological and productive characteristics of corn in different sowing dates. The experimental design was a randomized complete block in a factorial 2x6, with two corn hybrids (Dekalb 240 and Dow AgroSciences 2A106), and six sowing dates (09/15/2013, 30/09, 15/10, 30/10, 16/11 e 03/12, 2013), with three replications. We evaluated the plant height, ear diameter, ear length, number of row per ear, number of kernels per row, diameter of the cob, thousand grain weight and productivity. It performed the analysis of variance and the Tukey test for the factors sowing dates and hybrids. Was held still the Pearson correlation and the stepwise variable selection procedure of regression modeling. Morphological and productive characteristics of corn hybrids are influenced by meteorological elements in different sowing dates. Overall, both the hybrid D240 as 2A106 show better results versus the variables in spreading performed in 15/09 and 30/09. Late sowing (16/11 and 03/12) adversely affect the performance of the productive and morphological characters of hybrids. Among the weather elements studied, the minimum temperature has the highest contribution to the productivity values.

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Comportamento germinativo de sementes de cultivares de milho sob condições de hipoxia

Cited by 10 publications

References 7 publications

Physiological potential of soybean seeds under hypoxia and salinity stress

Physiological potential of soybean seeds under hypoxia and salinity stress

Potassium nitrate to overcome dormancy of Urochloa humidicola Comum seeds

Elementos meteorológicos sobre características morfológicas e produtivas do milho em diferentes épocas de semeadura

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