Influence of lignin content in soybean seed coat on the incidence of the storage fungus Aspergillus flavus

Abstract

-Seed quality may be affected by several factors, including permeability, color, and lignin content in the seed coat. This study aimed at evaluating influence of lignin content in the tegument of seed samples of six different soybean cultivars, in which half of each sample was inoculated with the fungus Aspergillus flavus, on the physical and physiological quality, and on the seed health, during 180 days storage period, under cold chamber with controlled conditions of temperature and RH. For that, at each interval of 60 days, samples were removed, and the physiological quality of these seeds was assessed by means of moisture and lignin contents; and by tests of seed health, germination, and electrical conductivity. The moisture content of seeds remained constant during all storage period. In the seed health test, it was found that inoculation was efficient, once the minimum incidence of the fungus in the inoculated seeds was 85%. In the germination test, there was a trend of reduction on percentage germination with the increase in storage period. However, there was an increase on electrical conductivity of seeds assessed. It was concluded that there is no interference of the lignin content in the seed coat on the resistance to infection by the fungus Aspergillus flavus, even after seed storage for a period of 180 days. Termos para indexação: Glycine max, inoculação, armazenamento de sementes, resistência à infecção.

Quality of soybean seeds with different lignin content obtained from desiccated plants

“…In general, cultivars BRS Silvânia RR and BRS Valiosa RR showed higher lignin content (0.461 and 0.320 g%), while cultivars BRS 245 RR and BRS 247 RR showed lower levels (0.146 and 0.182 g%), agreeing with previous results reported by Menezes et al (2009), Gris et al (2010) and Dantas et al (2012). Thus, in conformity with the initial purpose of this research, it was possible to divide cultivars in two groups, formed by the cultivars with high lignin content (BRS Silvânia RR and BRS Valiosa RR), and by the cultivars with low lignin content (BRS 245 RR and BRS 247 RR).…”

“…Studying the influence of lignin content in the quality and viability of soybean seeds after storing, Dantas et al (2012) observed that cultivars with higher lignin content showed lower proportion of normal seedling. Oliveira et al (2014) discuss that seeds with higher lignin content absorb less water, which is essential to the metabolic activities that occur during the germination process.…”

Seed coat specific weight and endosperm composition define the oil content of castor seed

“…Many physical and physiological characteristics such as resistance to physical damage, germination capacity, electrolyte leakage, and preservation of quality during storage in soybean is defined by the lignin content in the seed coat (Dantas et al, 2012;Menezes et al, 2009;Panobianco et al, 1999). However, lignin content is not associated with the seed coat thickness in soybean (Menezes et al, 2009).…”

Mn foliar sobre a qualidade sanitária e lignina de sementes de soja convencional e resistente ao glifosato1

“…Características do tegumento como a impermeabilidade e o elevado teor de lignina, podem contribuir na obtenção de sementes de soja de elevado potencial fisiológico (SILVA et al, 2008). Dantas et al (2012) constataram que o maior teor de lignina no tegumento de sementes de soja não conferiu maior resistência à infecção por Aspergillus flavus. Trabalhos são escassos que relacionem a nutrição mineral e o teor de lignina, principalmente em se tratando de sementes de soja; neste sentido, Bellaloui (2012) verificou que a aplicação foliar com boro modificou os teores de fenol, lignina e isoflavonas de sementes de soja.…”