Effect of weather parameters, host resistance and sowing date on disease severity and temporal dynamics of Fusarium wilt in chickpea (Cicer arietinum L.)

Abstract

Fusarium wilt incited by Fusarium oxysporum f. sp. ciceris is an economically damaging disease of chickpea (Cicer arietinum L.). Field experiments on epidemiological studies revealed that sowing during second fortnight of November curtailed the disease severity index (22.50 and 20.83% during 2018-19 and 2019-20, respectively) whereas, sowing during first fortnight of October enhanced the disease severity index (34.86 and 30.41%). The area under disease progress curve was significantly higher in susceptible variety JG 62 and was the least in resistant variety HC 1. The correlation analysis exhibited positive correlation of disease severity index with maximum and minimum temperature while negative correlation with relative humidity morning and evening, irrespective of date of sowing. The principal component analysis depicted resistance index, sowing time and weather parameters as positional factors in determining Fusarium wilt progression. In susceptible variety, Gompertz model was the best fitted model for simulating the Fusarium wilt epidemic over time.

A stepwise multiple regression model to predict Fusarium wilt in lentil

“…Researchers have hypothesized that relative humidity may be the trigger responsible for ascospore release. Turgor pressure within the ascus may be the mechanism for forcibly discharging ascospores (David, 2016; Khanna et al, 2022; Prussin II et al, 2015; Reis, 1990), and the balance between water inside the ascus and water in the vapour phase in the atmosphere may help to determine ascospore release.…”

“…Researchers have hypothesized that relative humidity may be the trigger responsible for ascospore release. Turgor pressure within the ascus may be the mechanism for forcibly discharging ascospores (David, 2016;Khanna et al, 2022;Prussin II et al, 2015;Reis, 1990), and the balance between water inside the ascus and water in the vapour phase in the atmosphere may help to determine ascospore release. Under favourable environmental conditions, the chlamydospores of particular Fusarium species are more likely to germinate and produce growing hyphae towards the roots of plants, in response to rhizosphere nutrients exuded by plants, and they often proliferate on root surfaces before they can enter the cortical tissue.…”

Biological, morphological and biochemical features of seeds of introduced genotypes of Cicer arietinum L.

“…Depending on the habitat, the morphological traits of any plant species vary. The ability of plants to form differentiated phenotypes that depend on environmental conditions is called phenotype modification or phenotypic plasticity (Khanna et al, 2022). Seeds are the initial stage of plant ontogenetic development, so at this stage, it is possible to study the ability of a plant organism to form several different, relatively appropriate phenotypes in many environments (La et al, 2022).…”