&lt;b&gt;Effects of the hydrogen potential and fungicide treatment on Pitaya seed germination

Ortiz, Thiago Alberto; Moritz, Aline; Oliveira, Mariana Alves de; Takahashi, Lúcia Sadayo Assari

doi:10.4025/actasciagron.v37i1.18088

Cited by 6 publications

(11 citation statements)

References 17 publications

(4 reference statements)

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“…From the few studies considering the pH effect on the germination process, it has been observed that pH levels between 3.0 and 11.0 in Lactuca sativa (Wandscheer et al, 2011) and between 3.0 and 9.0 in Hylocereus spp. (Ortiz et al, 2015) has not significantly influenced the percentage of germination. However, Ortiz et al (2015) found a significant effect of pH on vigor, expressed by GSI, in one of the three genotypes of Hylocereus spp.…”

Section: Introductionmentioning

confidence: 76%

“…(Ortiz et al, 2015) has not significantly influenced the percentage of germination. However, Ortiz et al (2015) found a significant effect of pH on vigor, expressed by GSI, in one of the three genotypes of Hylocereus spp. evaluated, with lower performance at pH 4.0; 5.0 and 6.0.…”

Section: Introductionmentioning

confidence: 76%

“…Similar behavior was observed for the seeds of the pitaya hybrid I and pitaya hybrid II, which had the germination process optimized when submitted to the pH levels of 6.0 to 8.0, expressing greater PG in this interval. However, according to Ortiz et al (2015), the pH effect was not significant for seed germination of three genotypes of Hylocereus spp. The lowest performances occurred in acid pH levels (lower than pH 4.5); pH levels between 6.0 and 7.5 were favorable to the germination process of Hylocereus spp.…”

Section: Introductionmentioning

confidence: 80%

“…It is known that several factors are involved and are likely to influence seed germination, being that the most studied are water, oxygen, temperature, light, and substrate. Besides these, pH is also a factor of relevance for the germination process and development of seedlings of cultivated species, although is relatively little studied (Ortiz et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

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2018

Aust J Crop Sci

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Seed germination depends on internal and external factors relating to the seed but the whole process will normally occur if there are no restrictions during the stages of germination. So, the aim of the present study was to evaluate the viability and the vigor of pitaya seed under different pH levels. A completely randomized design was employed under a 3 × 13 factorial design [pitaya genotypes: Hylocereus undatus (white pitaya); H. undatus x H. costaricensis (pitaya hybrid I), and H. costaricensis x H. undatus (pitaya hybrid II), and pH levels: 3

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Section: Introductionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 76%

Section: Introductionmentioning

confidence: 80%

Section: Introductionmentioning

confidence: 99%

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Untitled

2018

Aust J Crop Sci

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“…After the incubation period, the solution was sieved under running water to eliminate pulp residues and preserve the seeds, which were then placed on filter paper and shade dried at room temperature for 48 h (ORTIZ et al, 2015).…”

Section: Methodsmentioning

confidence: 99%

Tests for evaluating the physiological quality of pitaya seeds

Ortiz¹,

Moritz²,

Takahashi³

et al. 2015

Sem. Ci. Agr.

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Germination test is used to assess the physiological quality of seeds; however, since it is carried out under ideal conditions, this test has not been shown sufficient for this purpose. Instead, it is possible to use vigor tests, although the lack of standardized methodologies has reduced their applicability and reproducibility. Thus, this study aimed to develop methodologies for conducting tests of germination, accelerated aging, and electrical conductivity for the evaluation of the physiological quality of pitaya seeds. For this purpose, seeds from ripe Hylocereus undatus fruits were used. A completely randomized experimental design was used with four replications. The physiological quality of the seeds was assessed using germination, accelerated aging, and electrical conductivity tests, and the speed of germination index (SGI) and mean germination time (MGT) were determined for both the germination test and accelerated aging test. For the statistical analysis, we performed regression model adjustments and calculated the Pearson correlation coefficient (p < 0.05). The germination test for H. undatus seeds can be performed at 25 °C, with the aim of reaching the highest SGI and lowest MGT values. The accelerated aging test can be conducted at 43 °C for 48 h, because combining these factors favors the expression of seed vigor, allowing seeds to achieve the maximum SGI and minimum MGT, while reducing the time of the assay. The electrical conductivity test can be performed using 25 seeds at a temperature of 30 °C and a water volume of 10 mL, since under these conditions there is less interference from external factors on the leachate content of the solution. Key words: Accelerated aging, cactaceae, electrical conductivity, germination, Hylocereus undatus, vigor ResumoO teste de germinação é utilizado na avaliação da qualidade fisiológica de sementes; porém, devido à sua condução em condições ideais, não tem se mostrado suficiente para este propósito. Nesse sentido, há a possibilidade de recorrer aos testes de vigor, conquanto, a ausência de metodologias padronizadas tem dificultado a sua aplicabilidade e reprodutibilidade. Assim, o trabalho teve como objetivo determinar as metodologias dos testes de germinação, envelhecimento acelerado e condutividade elétrica, a fim de avaliar a qualidade fisiológica de sementes de pitaia. Para o estudo foram utilizadas sementes de frutos maduros de Hylocereus undatus. O delineamento experimental foi o inteiramente casualizado, com quatro repetições. A qualidade fisiológica das sementes foi avaliada pelos testes de germinação, envelhecimento acelerado e condutividade elétrica, além da determinação do índice de velocidade de germinação (IVG) e do tempo médio de germinação (TMG), ambos, em conjunto

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