caa a22 4500 477134254 CHVBK 20180405111713.0 cr unu---uuuuu 170330e19970101xx s 000 0 eng 10.1023/A:1002984516192 doi (NATIONALLICENCE)springer-10.1023/A:1002984516192 Pear mutagenesis: In vitro treatment with gamma-rays and field selection for vegetative form traits [Elektronische Daten] [S. Predieri, M. Magli, R.H. Zimmerman] In vitro shoots of four pear (Pyrus communis L.) cultivars, 'Conference', 'Doyenné d'Hiver', 'Passe Crassane' and 'Bartlett', were irradiated with gamma rays (3.5 Gy). Around 1000 microcuttings of each cultivar were treated. After three subcultures, microcuttings from both the irradiated shoots and additional non-irradiated shoots were rooted; plants obtained were used to establish a survey orchard in Ostellato (Ferrara), Italy. For the first 2 years in the field, growth and survival were observed, but no data were collected. Subsequently, field surveys were conducted to characterize the population and identify mutants for vegetative traits. Trees that showed phenotypic evidence of vegetative growth characteristics more desirable than those shown by the overall population and by control plants were selected and measured for three years. Traits used for selection were small tree size, wide branch angle and short internodes. Frequencies of variants with compact habit varied with cultivars from 0.5% to 2.7% of irradiated trees. Effect of mutagenic treatment and efficacy of the selection methods are discussed. Kluwer Academic Publishers, 1997 breeding nationallicence in vitro nationallicence mutagenesis nationallicence pear nationallicence selection nationallicence Pyrus communis nationallicence Predieri S. ISTEA, Istituto di Ecofisiologia delle Piante Arboree da Frutto, CNR, Bologna, Italy aut Magli M. ISTEA, Istituto di Ecofisiologia delle Piante Arboree da Frutto, CNR, Bologna, Italy aut Zimmerman R.H. USDA-ARS-Fruit Laboratory, 20705, Beltsville, MD, U.S.A aut Euphytica Kluwer Academic Publishers 93/2(1997-01-01), 227-237 0014-2336 93:2<227 1997 93 10681 https://doi.org/10.1023/A:1002984516192 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1002984516192 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Predieri S. ISTEA, Istituto di Ecofisiologia delle Piante Arboree da Frutto, CNR, Bologna, Italy aut NATIONALLICENCE 700 1- Magli M. ISTEA, Istituto di Ecofisiologia delle Piante Arboree da Frutto, CNR, Bologna, Italy aut NATIONALLICENCE 700 1- Zimmerman R.H. USDA-ARS-Fruit Laboratory, 20705, Beltsville, MD, U.S.A aut NATIONALLICENCE 773 0- Euphytica Kluwer Academic Publishers 93/2(1997-01-01), 227-237 0014-2336 93:2<227 1997 93 10681 Metadata rights reserved Springer special CC-BY-NC licence nationallicence SWISSBIB 476067448 BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer