n vitro shoots of six pear (Pyrus communis L.) cultivars, 'Conference', 'Doyenne d'Hiver', 'Passe Crassane', 'Bartlett', 'Abbe Fetel' and 'Butirra Precoce Morettini' were irradiated with gamma rays (3.5 Gy). After three subcultures, microcuttings from the irradiated shoots and from additional non-irradiated microcuttings were rooted to establish plants for survey orchards. All trees were individually observed for variation in fruit traits and for productivity. Trees were selected for improved characters related to production such as early bearing and consistent productivity. Variations observed in fruit appearance concerned degree of russeting, fruit shape and size. The frequencies of the observed variations in fruit traits depended on the cultivar, ranging from 0.81% in 'Doyenne d'Hiver' to 3.64% in 'Passe Crassane'. Of the 97 variants selected, only two showed chimeral behavior.
Pear mutagenesis: In vitro treatment with gamma-rays and field selection for productivity and fruit traits
Predieri S;
2001
Abstract
n vitro shoots of six pear (Pyrus communis L.) cultivars, 'Conference', 'Doyenne d'Hiver', 'Passe Crassane', 'Bartlett', 'Abbe Fetel' and 'Butirra Precoce Morettini' were irradiated with gamma rays (3.5 Gy). After three subcultures, microcuttings from the irradiated shoots and from additional non-irradiated microcuttings were rooted to establish plants for survey orchards. All trees were individually observed for variation in fruit traits and for productivity. Trees were selected for improved characters related to production such as early bearing and consistent productivity. Variations observed in fruit appearance concerned degree of russeting, fruit shape and size. The frequencies of the observed variations in fruit traits depended on the cultivar, ranging from 0.81% in 'Doyenne d'Hiver' to 3.64% in 'Passe Crassane'. Of the 97 variants selected, only two showed chimeral behavior.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
