《苹果的几个种的介绍英文版.ppt》由会员分享，可在线阅读，更多相关《苹果的几个种的介绍英文版.ppt（32页珍藏版）》请在三一文库上搜索。
1、Apple (Malus domestica Borkh.) a.k.a. Malus pumila P. Mill.,Image from ,Jake Fleming Department of Geography, UW Madison jeflemingwisc.edu,Family: Rosaceae Subfamily: Maloideae (with pears) Genus: Malus (40 sp.) Section: Malus Series: Malus Species: domestica,Taxonomy,A note on nomenclature: In his
2、2006 book The Story of the Apple, BE Juniper refers to both the domestic apple and the wild Central Asian apple as Malus pumila. The USDA has also adopted this convention. For clarity, and as Coart et al. 2006 calls into question the hypothesis upon which this is based, I use the older names: Malus
3、sieversii for the wild Central Asian apple and Malus domestica for the orchard apple.,,Importance,Worlds most important temperate fruit crop: 63 million tons/yr. Leading producers in 2004: China 18.7 Mtons (4 Mtons in 1990), United States 6 Mtons, Russia, Germany, Japan,Food and Agriculture Organiza
4、tion of the United Nations. http:/faostat.fao.org,Malus domestica - the specifics,Woody, long-lived tree Unlike congeners, extreme heterozygosity, does not breed true. Single parental event yields massive variation in fruit color, size, taste, flower color, thorns, tree habit, so Cultivars must be v
5、egetatively propagated “instant domestication” Perfect, self-incompatible flowers. n = 17. Most congeners and cultivars 2n, some 3n, 4n.,3 Stories of Domestication,Compilospecies conventional wisdom until c. 1990. Eurasian origin, somewhere/everywhere Malus sieversii Roem. Vavilov 1930. Harris, Robi
6、nson, Juniper 2002. Central Asian origin BREAKING! Malus sylvestris Mill. Coart et al. 2006. European origin?,Compilospecies hypothesis,Hypothesis: Malus domestica arose from some combination of crabapples in Eurasia, with possible recent introgression in North America (Watkins 1995),In Maloideae, h
7、ybridization between genera not rare (e.g. Malus x Pyrus) In Malus, species boundaries fuzzy, some hybrids occur M. domestica may (or may not) readily hybridize with sympatric congeners,M. sieversii hypothesis,As the Tien Shan Mountains rose and the Gobi and Taklamakan Deserts grew, ancestral Malus
8、populations were isolated Among a very diverse population making up as much as 80% of the forest, Some wild fruits are indistinguishable from cultivars Selection by bears? Human-mediated dispersal along Silk Road trade routes (but not by current residents) (Juniper and Mabberley 2006),Hypothesis: Ma
9、lus sieversii of Central Asia is the wild ancestor of domesticated apples. Other species contributed little or nothing. (Vavilov 1930),M. sieversii hypothesis,As the Tien Shan Mountains rose and the Gobi and Taklamakan Deserts grew, ancestral Malus populations were isolated Among a very diverse popu
10、lation making up as much as 80% of the forest, Some wild fruits are indistinguishable from cultivars Selection by bears? Human-mediated dispersal along Silk Road trade routes (but not by current residents) (Juniper and Mabberley 2006),Hypothesis: Malus sieversii of Central Asia is the wild ancestor
11、of domesticated apples. Other species contributed little or nothing. (Vavilov 1930),M. sieversii hypothesis,As the Tien Shan Mountains rose and the Gobi and Taklamakan Deserts grew, ancestral Malus populations were isolated Among a very diverse population making up as much as 80% of the forest, Some
12、 wild fruits are indistinguishable from cultivars Selection by bears? Human-mediated dispersal along Silk Road trade routes (but not by current residents) (Juniper and Mabberley 2006),Hypothesis: Malus sieversii of Central Asia is the wild ancestor of domesticated apples. Other species contributed l
13、ittle or nothing. (Vavilov 1930),M. sieversii hypothesis,As the Tien Shan Mountains rose and the Gobi and Taklamakan Deserts grew, ancestral Malus populations were isolated Among a very diverse population making up as much as 80% of the forest, Some wild fruits are indistinguishable from cultivars S
14、election by bears? Human-mediated dispersal along Silk Road trade routes (but not by current residents) (Juniper and Mabberley 2006),Hypothesis: Malus sieversii of Central Asia is the wild ancestor of domesticated apples. Other species contributed little or nothing. (Vavilov 1930),Bearington Bears c
15、atalog. $10.95,M. sieversii hypothesis,As the Tien Shan Mountains rose and the Gobi and Taklamakan Deserts grew, ancestral Malus populations were isolated Among a very diverse population making up as much as 80% of the forest (adaptive?), Some wild fruits are indistinguishable from cultivars Selecti
16、on by bears? Human-mediated dispersal along Silk Road trade routes (but not by current residents) (Juniper and Mabberley 2006),Hypothesis: Malus sieversii of Central Asia is the wild ancestor of domesticated apples. Other species contributed little or nothing. (Vavilov 1930),Bearington Bears catalog
17、. $10.95,Geography of M. sieversii,Harris et al. 2002,Note: Whats up with this map?,Dispersal into Europe,Silk Road was operational by 2100 ybp. In summer, went straight through Tien Shan One big apple found in Ireland, 3000 ybp. What is it? Alexander the Great, 2300 ybp, fought mock battles with ap
18、ple projectiles. Must have been bigger than crabs. 2400 ybp, Celt-Persian contact? 1300 ybp, Muslim empire, Central Asia-Spain,Molecular evidence,Harris et al 2002,Wild apple: Malus sieversii Domesticated apple: Malus domestica,cDNA gene matK Only 16 of 1341 characters informative 18-bp duplication
19、in M. domestica and 1 M. sieversii accession Other M. sieversii accessions tested only for duplication, did not have it,Nuclear ribosomal ITS,Robinson et al 2001,No M. sylvestris,=,USDA collections, M. sieversii,Forsline et al. 2003,Harris et al 2002s matK duplication,Forsline et al. 2003,8 of 10 M.
20、 sieversii accessions from Uzbekistan and Tajikistan (Robinson et al 2001),Other genetic support for M. sieversii,Morphological + RAPD + sequence data (ITS1, 5.8S rRNA, ITS2, matK) Forte et al. 2002 Isozymes DIA-2, AAT-2, PGM-1 and PGM-5 Wagner and Weeden 1999 Sampling? Strength of support? I dont k
21、now Forte, A.V. et al. 2002. Phylogeny of the Malus (apple tree) species, inferred from the morphological traits and molecular DNA analysis. Russian Journal of Genetics 38: 1150-1160. Wagner, I. and Weeden, N.F. 2000. ISOZYMES IN MALUS SYLVESTRIS, MALUS DOMESTICA AND IN RELATED MALUS SPECIES. Acta H
22、ort. (ISHS) 538:51-56,Floral morphology Fruit morphology,Morphological evidence for M. sieversii,Juniper and Mabberley 2006,Hybridization b/w cultivars and sympatric European crab apple, M. sylvestris, “almost absent”,Coart et al. 2003,Molecular evidence against M. sylvestris,3 of 76 “wild” specimen
23、s,STRUCTURE,BUT WAIT. M. sylvestris,Hypothesis: Actually, M. sylvestris, the European crab apple, is in some way ancestral to domesticated apples Unlike M. sieversii, M. sylvestris is solitary, not notably heterogeneous, rare, and produces bitter, inedible fruit. Contrary to their own earlier work,
24、Coart et al.s JULY 2006 article shows M. sylvestris to be much closer to M. domestica than previous, using cDNA PCR-RFLP 16 different chloroplast haplotypes based on: matK duplication, 1 point mutation, 2 restriction endonucleases (EcoRI, MseI),,Coart et al. 2006,Coart et al. 2006,Coart et al. 2006,
25、Coart et al. 2006,matK dupII,Greater chloroplast diversity of cultivars suggests some kind of hybridization Geographic distribution of rare haplotypes suggests sylvestris x domestica hybridization,Also,Coart et al 2006,Coart et al. 2006,Selected Sources,Coart, E.L.S., et al. 2003. Genetic variation
26、in the endangered wild apple (Malus sylvestris (L.) Mill.) in Belgium as revealed by amplified fragment length polymorphism and microsatellite markers. Molecular Ecology 12: 845-857. Coart, E.L.S., et al. 2006. Chloroplast diversity in the genus Malus: new insights into the relationship between the
27、European wild apple (Malus sylvestris (L.) Mill.) and the domesticated apple (Malus domestica Borkh.). Molecular Ecology 15: 2171-2182. Forsline, P.L. et al. 2003. Collection, maintenance, characterization, and utilization of wild apples of Central Asia. Horticultural Reviews 29: 1-62. Harris, S.A.,
28、 J.P. Robinson, and B.E. Juniper. 2002. Genetic clues to the origin of the apple. TRENDS in Genetics 18(8): 426-430. Juniper, B.E. and D.J. Mabberley. 2006. The Story of the Apple. Portland: Timber Press, Inc. Vavilov, N.I. 1930. Wild progenitors of the fruit trees of Turkestan and the Caucasus and the problem of the origin of fruit trees. Proceedings of the 9th International Horticultural Congress, London, pp. 271-286. Watkins, R. 1995. Apple and pear. In Evolution of Crop Plants (Smartt, J. and Simmonds N.W. eds.). Longman. 418-422.,