Curvularia lunata as, a dominant seed-borne pathogen in Dalbergia sissoo Roxb: Its location in seed and its phytopathological effects

Abstract

Dalbergia sissoo (shisham) seeds naturally infected with Curvularia lunata showed either black discoloration (1.25 to 8.75%) or appeared dull (0.50 to 10.0%). When they were incubated, they yielded pure growth of the pathogen. During location studies, cleared whole mount preparation and component plating revealed the presence of infection restricted to the seed coat and cotyledons of asymptomatic seeds. However, this pathogen penetrates the deeper tissue of symptomatic seeds to the embryonic axis. Due to heavy infection, the disintegration of cells results in the formation of lysogenic cavities. The fungus enters the seeds through the hilar region and epidermal cells of the seed coat to the aleurone layer and finally into the cotyledonary cells of the embryo. The pathogen is both externally and internally seed-borne. The internal inoculum affected seed germination, viability and caused high total (pre-and post-emergence) losses (15 to 80%). The pathogen was transmitted from seed to seedling causing heavy losses to the tree plantation.

Molecular characterization and vegetative growth of pathogenic seed-borne fungus, Curvularia lunata of tomato and its in vitro control measures

“…Curvularia spp. are internally and externally seed-borne pathogenic fungi, affecting seed germination and seedling vigour, known to be responsible for pre-and post-emergence seedling mortality (Gupta et al, 2017). They cause seed disclouration, even produce toxins that may be injurious to man and domestic animals.…”

Unravelling The Diversity of Cherry Tomato (<i>Solanum Lycopersicum</i> Var. <i>Cerasiforme</i>) Seed Microbes and Their Effect on Seed Health

“…Curvularia species such as C. lunata had been previously reported in seeds of Coix lacryma-jobi (Kim & Lee 1998), Andropogon sp. (Santos et al 2018), Dalbergia sissoo (Gupta et al 2017), and Solanum lycopersicum in Pakistan (Iftikhar et al 2016). This study first reported C. aeria associated from seeds of cherry tomatoes (Solanum lycopersicum var.…”