Lignin monomeric composition in soybean seed coats and resistance to mechanical damage

Abstract

Soybean seeds are crucial for global food production. Various factors affect the quality of soybean seeds, including mechanical damage, which can lead to reduced germination potential and decreased seedling vigor. The presence of lignin in the seed coat contributes to resistance to mechanical damage. However, the relationship between the monomeric composition of lignin and mechanical damage is unknown. To fill this gap, we evaluated the contents of monomers hydroxyphenyl (H), guaiacyl (G), and syringyl (S) in seed coats of three cultivars of soybean, namely, Doko, IAS-5, and Savana. The results revealed that the monomeric composition of lignin varied between resistant and susceptible cultivars. The levels of G and S monomers were inverse in the cultivars Doko and Savana, suggesting that the composition of lignin monomers may play a crucial role in the resistance of soybean seeds to mechanical damage. In addition, negative linear regressions between lignin and S monomer contents and S/G ratios could be helpful as an alternative to identify resistance in soybean seeds.

Soybean Seed Coat Cracks and Green Seeds—Predisposing Conditions, Identification and Management

“…According to Souza and Marcos-Filho [7], seed longevity correlates with the seed tegument permeability, and the lignin level in the seed tegument correlates with the seed's mechanical resistance. Capeleti et al [29] and Menino et al [30] also concluded that the seed coat lignin content and composition correlate positively with the resistance of soybean seeds to mechanical damage.…”

Postharvest Chemical Treatment of Physiologically Induced Stem End Blockage Improves Vase Life and Water Relation of Cut Flowers

“…PAL is an important enzyme involved in a plant's reaction to a wound and functions as a catalyst in the phenylpropanoid pathway [6]. After the synthesis of trans-cinnamic acid, different catalytic reactions lead to the generation of different phenolic compounds, such as sinapic acid, ferulic acid, caffeic acid, and p-coumarate, which are converted into their respective monomers (sinapyl, coniferyl, feruloyl, and p-coumaryl alcohols) by esterification, methoxylation, hydroxylation, and reduction reactions [17]. These monolignols are then further polymerized by peroxidase enzyme (POD) into lignin and suberin [18].…”