Article | 8. 2016 Vol. 34, Issue. 4
Breeding of the Scab-Resistant Pear Cultivar ‘Greensis’

Pear Research Institute, National Institute of Horticultural and Herbal Science, Rural Development Administration1
R&D Coordination Division, Rural Development Administration2

2016.8. 655:661


To develop scab-resistant pear (Pyrus spp.) varieties with fruits that are as crisp and juicy as Asian pears, a cross was made between ‘Whangkeumbae’ and ‘Bartlett’ varieties (P. pyrifolia × P. communis) at the Pear Research Institute of the National Institute of Horticultural & Herbal Science, Rural Development Administration, in 1994. Among the 285 seedlings, ‘Greensis’ was first selected in 2006 for its good eating quality and named in 2012 after regional adaptation tests in nine regions and ten experimental plots from 2007 to 2012. The tree showed a vigorous growth habit and semi-spreading characteristics, like ‘Whangkeumbae’. The optimum fruit harvest date was also around Sept. 26 and fruit was round in shape and green in skin color at maturity. Average fruit weight was 470g, and the soluble solids content was 12.4°Brix. The flesh was very crisp and juicy, and had good eating quality. Its’ leaf size was similar with ‘Bartlett’ and smaller than ‘Whangkeumbae’. The average of full bloom date of ‘Greensis’ was determined as Apr. 26, which was six days later than ‘Whangkeumbae’ and similar with ‘Bartlett’. S genotypes of ‘Greensis’ were identified as S4Se by S-allele PCR product sequencing analysis. It seems that the S4 allele was inherited from ‘Whangkeumbae’ and the Se allele from ‘Bartlett’. ‘Greensis’ displayed strong resistance to scab disease caused by Venturia nashicola , similar to European pear cultivars like ‘Beurre Hardy’ and, ‘Conference’. ‘Greensis’ was also highly resistant to black leaf spot (Alternaria kikuchiana ) in the field.

1. Abe K, Kurihara A (1992) Screening method of pear scab resistance. Bull Fruit Tree Res Stn 23:155-168   

2. Brewer LR, Morgan C, Alspach PA, Volz RK, White AG (2008) Interspecific pear breeding for flavour and texture. Acta Hortic 800:461-468. doi:10.17660/ActaHortic.2008.800.58  

3. Cho EK, Cho WT, Lee EJ (1985) The casual organism of pear scab in Korea. Korean J Myco 13:263-265   

4. Kang SS, Cho KS, Cho HM, Ko GC (2001) Genotype for self-incompatibility in ‘Whangkeumbae’ pear (Pyrus pyrifolia Nakai) Cultivar. Korean J Hortic Sci Technol 42:439-443  

5. Korea Agro-Fisheries & Food Trade Corporation (KATI) (2015) Export status of agriculture, forest, fishery and food in Korea, pp 316-320  

6. Korean Rural Economic Institute (KREI) (2013) Market prospective and the production condition of environmentally friendly agricultural products. KREI, Naju, pp 231-237  

7. Rural Development Administration (RDA) (2003) Manual for agricultural investigation. RDA, Suwon, pp 535-537   

8. Rural Development Administration (RDA) (2012) Manual for agricultural investigation. RDA, Suwon, pp 633-636  

9. Shin IS, Hyeon IH, Hwang HS, Hong SS, Cho KH, Cho HM (2004) Screening of scab (Venturia nashicola) resistance germplasms in Pyrus species. Korean J Hortic Sci Technol 22:63-68  

10. Takasaki T, Okada K, Castillo C, Moriya Y, Saito T, Sawamura Y, Norioka N, Norioka S, Nakanishi T (2004) Sequence of the S9-RNase cDNA and PCR-RFLP system for discriminating S1- to S9-allele in Japanese pear. Euphytica 135:157-167. doi:10.1023/B:EUPH.0000014907.50575