Abstract
Eighteen bean cultivars were grown from seed in a growth chamber and exposed to 140 pphm ozone for 1 hr. ‘Sanilac,’ ‘Tenderette,’ ‘Blue Lake Stringless,’ ‘Bush Blue Lake 290,’ and ‘Spurt’ were the most sensitive to ozone; ‘Pinto 111’ was moderately sensitive; and ‘Black Turtle Soup’ and ‘French’s Horticultural’ were the most resistant. Necrotic flecking, dispersed over most of the leaf, characteristically developed on the cultivars ‘Spurt,’ ‘Early Gallatin,’ ‘Orbit,’ and ‘French’s Horticultural.’Necrotic patching, restricted to certain areas of the leaf, characteristically developed on ‘Sanilac,’ ‘Blue Lake Stringless,’ ‘Bush Blue Lake 290,’ ‘Bush Blue Lake 274,’ ‘Apollo,’ ‘Coloma,’ ‘Tempo,’ and ‘Black Turtle Soup.’ Pigmented lesions on adaxial surfaces developed on all ‘Sanilac’ plants and on some ‘Resistant Asgrow Valentine’ and ‘Pinto 111’ plants. A generalized chlorosis was observed on some plants of all cultivars. Cultivar sensitivity was evaluated by determination of chlorophyll concentration and visual observations. For most cultivars, similar estimates of injury were obtained by the 2 methods. Injury assessments differed the most for cultivars that developed the necrotic patching symptom.