, and 290 crosses were made for intergeneric crossing. A total of 962 crosses were made for all combinations. To facilitate the large number of hybridizations, flowers were not emasculated; however, all progeny were evaluated based on flower and plant
Intergeneric hybridization in the Rosaceae, subtribe Malinae ( Sun et al., 2018 ), is an important reproductive mechanism that has facilitated plant speciation and domestication of novel plants ( Postman, 2011 ); however, these wide hybridization
Publishers, Hauppauge, NY Tang, F. Wang, H. Chen, S. Chen, F. Liu, Z. Fang, W. 2011 Intergeneric hybridization between Dendranthema nankingense and Tanacetum vulgare Sci. Hort. 132 1 6 Wang, H.C. Yang, J.B. Compton, J.A. Sun, H. 2006 A phylogeny of
intergeneric hybrids through conventional breeding could take too long to be economically or practically feasible for many breeding programs. Although hybridization between species in Dissotis and Tibouchina has the potential to create novel ornamental
The genus Pyrus has been classified into at least 22 primary species. These can be grouped by geographical distribution and/or taxonomic relationships. The European group includes P. communis L., P. nivalis Jacq., and P. cordata, (Desv.) Schneid. The North African group contains P. longipes Coss. and Dur., P. gharbiana Trab., and P. mamorensis Trab. The west Asian group consists of P. syriaca Boiss., P. elaeagrifolia Pall., and P. amygdaliformis Vill., P. salicifolia Pall., P. glabra Boiss., P. regellii Rehd., (syn. P. bucharica and P. heterophylla Reg. & Schmalh). The medium to large fruited east Asian species are P. pyrifolia (Burm.) Nak., P. kansuensis, P. ussuriensis Max., P. hondoensis Kik. and Nak., while the Asian “pea” pear species are P. calleryana Dcne., P. betulaefolia Bung., P.fauriei Schneid., P. dimorphophylla Makino, and P. koehnei Schneid. (3, 27). A number of nonprimary species also appear in the literature, which may be either botanical varieties, subspecies, or interspecific hybrids. Among the east Asian group, P. bretschneideri Rehd. is a probable hybrid of P. betulaefolia and the cultivated forms of P. pyrifolia; P. phaeocarpa Rehd. may be a P. betulaefolia × P. ussurensis hybrid, whereas P. serrulata Rehd. is a probable interspecific hybrid involving P. pyrifolia and P. calleryana.
Intergeneric hybrids between wingnut (Pterocarya sp.) and walnut (Juglans regia) were developed by regenerating plants from somatic embryos produced on immature cotyledons of seed from control-pollinations. Hybridization was confirmed by isozyme analysis using starch gel electrophoresis. To the best of our knowledge, this is the first report of hybrids between wingnut, which has a high level of resistance to Phytophthora spp. and nematodes, and walnut. Wingnut may now be used as a source of germplasm for improving walnut rootstocks.
, and only a few native blue species have been applied to blue Phalaenopsis hybridization ( Tsao et al., 2020 ). Blue flowers of most plants are the result of delphinidin accumulation or expression ( Qingyu and Silan, 2004 ), and in only a few cases
A series of crosses were made between genera within Theaceae including Camellia, Franklinia, Stewartia, and Tutcheria. Two valid intergeneric hybrids were obtained between Camellia and Franklinia alatamaha Marsh. The first, a C. japonica L. (2n=30) × F. alatamaha (2n=36) hybrid with 33 chromosomes, was intermediate in phenotypic characteristics. The second, a C. sasanqua Thunb. (2n=90) × F. alatamaha (2n=36) with 63 chromosomes, was phenotypically very similar to the C. sasanqua parent.
plants exhibiting a combination of desirable traits from H. macrophylla and D. febrifuga . Materials and Methods Intergeneric hybridization. Dichroa febrifuga selection GUIZ 48 and three H. macrophylla cultivars (Kardinal, Taube, and
Post-pollination barriers to intergeneric hybridization between Easter cactus [Hatiora gaertneri (Regel) Barthlott, H. rosea (Lagerheim) Barthlott, and H. ×graeseri Barthlott ex D. Hunt] and holiday cactus [Schlumbergera truncata (Haworth) Moran and S. ×buckleyi (Buckley) Tjaden] were determined and procedures were devised for circumventing these barriers. Examination of Hatiora and Schlumbergera pistils at 72 hours after intergeneric crosses indicated no abnormalities in pollen germination or pollen tube growth in the upper style. Pollen tubes of Hatiora were arrested in the lower half of Schlumbergera styles and failed to enter the ovary. Schlumbergera pollen tubes exhibited normal growth in Hatiora styles but most tubes lost directionality, burst, or failed to penetrate the micropyles after reaching the ovary. Three growth regulators (BA, GA3 and NAAm) were applied individually to ovaries of `Crimson Giant' Easter cactus after intergeneric crosses. GA3 and NAAm increased fruit set compared to the control (lanolin alone) or BA but none of the fruit harvested 160 days after pollination contained mature embryos. Four progeny were obtained when a short-styled S. ×buckleyi clone was crossed as a female parent with H. ×graeseri. Isozyme patterns and morphological characteristics confirmed that the four progeny were intergeneric hybrids. This is the first report of successful intergeneric hybridization between Hatiora and Schlumbergera. Chemical names used: N-(phenylmethyl)-1H-purine-6-amine [benzyladenine (BA)]; gibberellic acid (GA3); α-naphthaleneacetamide (NAAm).