Evaluation of genetic resources of sweet cherry for the selection of breeding materials in Korea
This study was conducted to select the breeding materials for the development of a new cultivar containing useful traits in 52 collections of sweet cherry. The main goals in sweet cherry breeding program are for the improvement of fruit quality, self compatibility, early maturing, late blooming, cold hardiness and low fruit cracking in the rainy season. In this study, blooming phenology, cold hardiness of dormant branches, frost damage in blooming time was evaluated. Blooming phenology was determined at five different stages (bud swell, side green, first bloom, full bloom, and petal fall). Sweet cherry cultivars were classified into 5 groups; very early, early, mean, late, very late blooming group. Dormant branches were cut 2 times in the winter season. 'Benisayaka' and 'Early Rivers' showed the lowest percentage of browning, while other cultivar showed almost 50% of browning. 'Napoleon' cultivar was sensitive to the temperature between -20 and -30°C. Frost hardiness in spring was evaluated in 5 levels according to the damage ratio of stigma. Ten cultivars including 'Szomolyai fekete' and 'Diwang' showed the lowest percentage of browning, below 5%, while 'Tokonishiki' and 'Seikonishiki' were damaged more than 51%. In general, several collections originated from China and Ukraine tended to be hardy to spring frosts. We selected the 10 breeding materials containing useful traits for the development of a new cultivar. Over 2,500 seeds produced by crossing the cultivars of 'Lapins', 'Stella', 'Starkrimson', 'SatoNishiki', 'Benisayaka', 'Seikonishiki', 'Summit', 'Szomolyai fekete', 'Gassannishiki' and 'Regina' were collected.
Nam, Eun Young, Yoon, Ik Koo, Kwon, Jung Hyun, Yun, Seok Kyu, Chung, Kyeong Ho, Bae, Hae Jin , Jun, Ji Hae and An, Jeong Hoon 2017. Evaluation of genetic resources of sweet cherry for the selection of breeding materials in Korea. Acta Hort. (ISHS) 1161:55-60
Prunus avium, germplasm, blooming phenology, cold hardiness