The effect of temperature and light intensity on growth and sporulation of Puccinia striiformis on wheat

Abstract

Urediniospore production by Puccinia striiformis on wheat per unit leaf area infected was much lower at low light intensities than at high light intensities. The number of pustules per unit area of infected leaf and the daily sporulation rate per pustule increased linearly with increasing light over the range 10–50 W/m2. Increasing temperature between 7 and 20°C shortened latent period and reduced the longevity of sporulating leaves. Colonization rate and the frequency of pustules per unit area of infected leaf increased between 7 and 15°C but declined markedly at 20°C. Spore production reached its peak earlier and declined more rapidly with increasing temperature between 7 and 15°C. this decline being less marked in the highly susceptible cultivar Maris Beacon than in the more resistant Maris Nimrod and Maris Huntsman.

Effect of density and age of lesions on sporulation capacity and infection efficiency in wheat leaf rust (Puccinia recondita f.sp. tritici )

“…Equation 8, relating the accumulated spore production to the lesion age and the nature logarithm of the lesion density, describes bell-shaped sporulation curves ( Fig. 4) typical of cereal rust fungi (Mehta & Zadoks, 1970;McGregor & Manners, 1985;Sache & de Vallavieille-Pope, 1993). These curves can be used to predict daily values of the spore production, which are input of demographic models of the development of a fungal population (Sache & de Vallavieille-Pope, 1993;Sache & Zadoks, 1995).…”

“…Both sporulation capacity and infection efficiency have been measured under controlled conditions for several fungal pathogens (Sache & de Vallavieille-Pope, 1995). In cereal rust fungi, sporulation capacity and infection efficiency are affected by abiotic factors, such as temperature, wetness duration, and light intensity (McGregor & Manners, 1985;de Vallavieille-Pope et al, 1995). Biotic factors related to the host plant, which characterize its resistance level, may also shape sporulation and infection processes (Parlevliet, 1979).…”

Effects of induced resistance on infection efficiency and sporulation of Puccinia striiformis on seedlings in varietal mixtures and on field epidemics in pure stands

“…All spores from one pot were collected together. Spores, dissociated in a drop of Tween 20@ (polyoxyethylen sorbitan monolaurate, Merck-Schuchardt, Hohenbrunn, Germany) and then in 20 ml of a buffered electrolyte solution (Isoton| II, Coultronics France S.A., Margency), were counted using a Coulter | Counter (McGregor and Manners, 1985).…”

Effect of leaf age and nitrogen fertilisation on sporulation of crown rust (Puccinia coronata var. lolii) on perennial ryegrass (Lolium perenne L.)

“…The production of Erysiphe graminis conidia from individual pustules on barley has been shown to decrease with age (Woolacott & Ayres, 1984) as has sporulation in powdery mildew pustules of oats (Carver & Carr, 1978). The sporulation rate and total spore production of rust fungi have been shown to fall linearly with decreasing light intensities (McGregor & Manners, 1985) suggesting that growth room studies may show lower levels of spore production than occur in the field.…”