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the tetraploids being the result of unreduced gametes from the diploid parent. A few intersectional Vaccinium hybrids have been discovered or created. The most widely studied natural intersectional hybrid {[ V. intermedium = V. myrtillus (section

development of pollination techniques, embryo rescue, and polyploidization methods, many intersection hybrids, such as the LA (Longiflorum × Asiatic), LO (Longiflorum × Oriental), and OT (Oriental × Trumpet) hybrids, have been bred with superior growth vigor

× V. arboreum crosses made later using other tetraploid V. arboreum plants. These crosses gave far fewer hybrids per pollinated flower than analogous intersectional hybrids made at the diploid level ( V. darrowii section Cyanococcus × V

require continuous moisture in the top meter of soil. Several intersectional crosses have produced hybrids in Vaccinium ( Ballington, 1980 , 2001 ; Darrow and Camp, 1945 ; Rousi, 1963 ) but our attempts to cross diploid V. arboreum with tetraploid

hybrids was given ( Lyrene, 2016 ). The purpose of this article is to describe the results of backcrossing these F 1 intersectional hybrids to the two parent taxa. Materials and Methods Evaluation of hybrid seedlings in high-density field nursery. Seeds

color for T. arizonicum × T. lanatum hybrids were purple, and thus resemble the purple-blue flowers of T. lanatum . Table 1. Morphological comparisons among T. arizonicum , the intersectional hybrid T . arizonicum × T. lanatum, T

; Hiscock and McInnis, 2003 ; Morgan et al., 2011 ). Postzygotic barriers include failure of the embryo/seed to fully develop, abiotic and biotic stresses on seed and fruit development (e.g., drought, wind, and animal feeding), and hybrid necrosis

that retained the nondehiscent fruit characteristic resulted from this intersectional cross between B. madagascarensis (section Nicodemia) and B . crispa (section Buddleja). Resulting hybrids were sterile; therefore, incorporating its unique traits

reported interspecific, intra- and interploid hybrids ( Table 3 ). In certain cases, analysis of genome size helped to substantiate or refute the authenticity of the hybrids. For example, the intersectional, intraploid hybrid Magnolia ‘Katie-O’ (NCSU 2004

) investigated low P fertility as an alternative to PGRs using 0.3–31 ppm P with several floriculture species, including argyranthemum ( Argyranthemum frutescens ), aster ( Aster novi-belgii ), pentas ( Pentas lanceolate ), and hybrid rose ( Rosa × hybrid ). For