PEAR (PYRUS L.) GENETIC RESOURCES FROM NORTHERN JAPAN: EVALUATION OF THREATENED LANDRACES FOR MORPHOLOGICAL AND AGRONOMICAL TRAITS
The region of distribution of Pyrus L., endemic in northern Japan including Iwateyamanashi, (Pyrus ussuriensis var. aromatic author) has been decreasing, thus conservation and evaluation are urgently needed. 750 pear accessions were collected and deposited at Kobe University in an ex situ field genebank. The 30 landraces in this collection were established by top grafting to evaluate morphological and agronomical fruit traits of. Flowering date, harvest date, fruit shape, skin color, diameter, height, peduncle length, fresh weight, number of locules, calyx persistency, number of sepals, flavor, firmness, sugar content (Brix), pH, and astringency were investigated for two years. Sugar content ranged from 9 to 16.1%. pH of fruit extract ranged from 3.0 to 4.8. Fruit having a high acid content are suitable for cooking or processing. Days from full bloom to harvest ranged from 94 to 209. By sensory evaluation, eleven accessions were revealed to have sweet and strong flavors previously undetected in modern Japanese pear cultivars. Early maturing cultivars had a significant tendency to have a strong flavor. One landrace, Sanenashi was seedless. Until the 1940s, Sanenashi fruit was used for canning. These threatened landraces possessed unique agronomic traits not found in named Japanese pear cultivars. Pear genetic resources collected from northern Japan will provide new resources for breeding and industry.
Matsumura, Y., Kakehi, S., Masaki, K., Miyake , M., Katayama, H. and Uematsu, C. (2011). PEAR (PYRUS L.) GENETIC RESOURCES FROM NORTHERN JAPAN: EVALUATION OF THREATENED LANDRACES FOR MORPHOLOGICAL AND AGRONOMICAL TRAITS. Acta Hortic. 918, 971-982
Iwateyamanashi, germplasm collection, flavor, seedless, pairwise comparison