Induction of resistance to Colletotrichum truncatum in lima bean

Abstract

Anthracnose (Colletotrichum truncatum) is one of the major diseases of the lima bean culture, found in production fields, causing decrease in productivity. The objective of this study was to evaluate the effect of abiotic and biotic inducers applied in lima bean plants to reduce anthracnose severity. Lima bean accessions were used and treated with: the abiotic inducers calcium silicate (Agrosilício Plus) and silicate clay (Rocksil), using the 3 g dose.L-1; the biotic inducer citric biomass extract (Ecolife), at the dose of 3 mL.L-1; and distilled water as control. To evaluate the resistance induction, the results of severity and degree of resistance of fava bean at 7, 11, 15, 19 and 23 days after inoculation were considered according to the scale of grades and classes of reactions. The design was a randomized block in a factorial arrangement 4 × 15 (treatments × hits) with four blocks. Resistance inducers Agrosilicon Plus, Ecolife and Rocksil have potential to be used in the management of anthracnose in fava bean. The studied accesses showed degree of resistance, being able to be explored in relation to obtaining anthracnose resistant cultivars in future breeding programs of this crop.

Eliciators increase gas exchanges and induce the Zea mays antioxidant system

“…The elicitors used in our study induced changes in gas exchange and antioxidant activity. The increase in stomatal conductance and photosynthesis in plants from seeds soaked with Rocksil ® and Thiabendazol ® can be explained by the silicon presence in its formula-tion (Gomes and Nascimento, 2018). Silicon acts in osmotic regulation by increasing the K + absorption, the osmotic pressure regulating ion, responsible for stomatal opening and closing (Mahdieh et al, 2015;Verma et al, 2020).…”

“…The reduction in PAL activity in plants whose seeds were soaked in Ecolife ® can be explained by the increase in the ascorbic acid concentration (Carvalho et al, 2021), which is a non-enzymatic antioxidant, enzymes cofactor involved in photosynthesis, hormones biosynthesis such as ethylene and antioxidant regeneration under adverse conditions, inhibiting the abscisic acid and ROS accumulation (Yanwen et al, 2019). In addition, Ecolife ® has in its basic composition, polyphenols, flavonoids, phytoalexins and organic acids; and, being one of the PAL functions in plant metabolism is to act in the metabolic path-way of phenolic compounds synthesis (Jiang and Joyce, 2003;Gomes and Nascimento, 2018), possibly there was less enzyme activity, due to the formulation of the elicitor that helps supply the plant's needs.…”

Antagonism of Trichoderma on the control of Fusarium spp. on Phaseolus lunatus L.

“…The Paraíba state accounts for almost 50% of the production of this legume in the Northeast region and is cultivated mainly by family farmers (Gomes, Nunes, Nascimento, Souza & Porcino, 2016). However, fava bean productivity has been reduced by diseases (Gomes & Nascimento, 2018). The seeds can carry pathogens and introduce them into new production areas (Silva-Flávio, Sales, Aquino, Soares, Aquino & Catão, 2014;Nascimento & Medeiros, 2015).…”