关键词: 梨, 品种, 果肉, 石细胞含量

Abstract: Stone cell content of 304 pear accessions of 5 pear（Pyrus L.） species preserved in National Germplasm Repository of Apple and Pear were measured by gravimetric method，including 117 Chinese white pear cultivars（P. bretschneideri Rehd.），89 sand pear cultivars〔P. pyrifolia （Burm.f.） Nakai〕，35 Ussurian cultivars（P. ussuriensis Maxim.），8 Xinjiang pear cultivars（P. sinkiangensis Yü），16 common pear cultivars（ P. communis L.） and 39 Pyrus hybrid cultivars. It was showed that the mean value of stone cell content per 100 g fresh weight（FW）of flesh in all cultivars was 0.684 g，ranging from 0.010 g to 6.678 g. Mean value and varying range of stone cell content of P. bretschneideri，P. communis，P. pyrifolia，P. ussuriensis were 0.462 g /0.020–1.479 g，0.524 g /0.027–1.136 g，0.552 g /0.01–2.018 g，1.887 g /0.256–6.678 g，respectively. Eight cultivars with very low stone cell content were screened through 3-year evaluation，they are‘Zaosu’，‘Deshengxiang’，‘Akaho’，‘Saint Maria’，‘Siyangqingli’，‘Conference’，‘Bartlett’and‘Qingkui’.

Key words: pear, cultivar, flesh, stone cell content