Avaliação do vigor de sementes de girassol por meio de análise de imagens de plântulas

Abstract

O trabalho teve como objetivo avaliar a eficiência do sistema computadorizado de análise de imagens de plântulas Seed Vigor Imaging System (SVIS(r)), em comparação com os outros testes recomendados para determinação do vigor de sementes de girassol. Foram utilizados dez lotes de sementes, cultivar Catissol 01, os quais foram avaliados quanto ao potencial fisiológico por meio dos testes de germinação, envelhecimento acelerado, emergência de plântulas em areia e em campo e análise de imagens de plântulas com o sistema SVIS(r), aos 0 e 4 meses de armazenamento. O delineamento experimental utilizado foi inteiramente casualizado para os testes realizados em laboratório e blocos ao acaso para o teste de emergência de plântulas em campo; em ambos os casos, foram utilizadas 4 repetições. Os dados foram submetidos à análise de variância e as médias comparadas pelo teste de Scott Knott a 5% de probabilidade. Verificou-se que a análise computadorizada de imagens de plântulas com SVIS(r) é eficiente para avaliação do vigor de sementes de girassol.

Growth of ornamental sunflowers in two growing seasons under semiarid conditions

“…Considering each cultivars, 'Sol noturno', 'Jardim amarelo alto' and 'Sunflower F1 vincents choice' reacted in a similar way on both growing seasons and 'Bonito de outono sortido', 'Sol vermelho' and 'Sunflower F1 sunbright supreme' provided significant rates when sown in GS1, being 47.5%, 31.57% and 38.27%, respectively, faster than in GS2, probably related to the higher temperatures (Table 1), that stimulate initial seedling growth. These results, in general, were lower than those reported by Barros and Rossetto (2009) when different seeds lots of sunflower 'Catissol' (13.31 to 16.54) were evaluated, but are closed to those verified by Rocha et al (2015) for the 'Catissol 01', whose ESI values ranged from 9.0 to 12.0. According to Khalifa et al (2000), the germination of sunflower seeds takes relative less time under high temperature and this can result in a shortly cycle.…”

“…This result indicates the high potential of seed germination when humidity and temperature are controlled. For sunflower 'Catissol 01' the germination in the field (55%) was reduced when compared to results of germination in laboratory (76.0%) (Rocha et al, 2015). Different from laboratory controlled conditions, emergence of seedlings from the soil in open field depends on a range of environmental factors of which water and temperature are the most important (Bewley et al, 2013).…”

Rice seeds vigor through image processing of seedlings

“…Similar results were observed in the classification of sunflower seed vigor (ROCHA et al, 2015), and super-sweet corn seed (ALVARENGA et al, 2012). Although, the results of these software are promising, the present research shows routines developed for the digital image processing of rice seedlings with the math tool Matlab ® , obtained through digitalization in photocopier, and that can be used without the necessity of purchasing a software or specific equipment.…”

Assessing the physiological quality of common bean seeds using the Vigor-S® system and its relation to the accelerated aging test

“…Results obtained by Silva et al (2012) showed that uniformity of seedling development can provide useful information regarding the degree of seed deterioration, initial growth potential, and uniformity of seedling emergence of crotalaria. In contrast, in studies on seeds of cucumber (Chiquito et al, 2012), sunflower (Caldeira et al, 2014), carrot (Pinto et al, 2015), maize (Marchi and Cicero, 2017), and soybean (Medeiros and Pereira, 2018), the seedling uniformity index did not correlate with the vigor of the seed lots evaluated. However, in those studies, the index proposed by Sako et al (2001) was used.…”

“…It is known that degeneration of cell membranes is the first event in the deterioration process. Thus, the use of tests based on different principles can contribute to obtain more reliable responses in respect to the physiological potential of seed lots (Rocha et al, 2015).…”