Trifoliate Orange

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Trifoliate Orange

 

(Poncirus trifoliata), the only species of the plant genus Poncirus of the family Rutaceae. A strongly branched small tree reaching 3 m in height, the trifoliate orange has deciduous trifoliate leaves and strong, sharp axillary thorns. The flowers are bisexual, white, and odorless; they are axillary and appear singly or in pairs. Flowering occurs before the leaves open. The greenish yellow spherical fruits are small, measuring 3–5 cm in diameter. They are many-seeded and have a bitter pulp. The rind is aromatic, slightly pubescent, and quite thick. The juice contains about 5 percent citric acid.

The trifoliate orange grows in North China. In the USSR it is raised in regions where citrus crops are grown as stocks. The plant tolerates brief frosts to – 25°C. Propagation is by seed. The trifoliate orange is used in selective breeding for developing more winter-hardy intergenus and interspecies hybrids of citrus crops.

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Studies on the structure and development of secretory cavities in Poncirus trifoliata.
Results of a field survey revealed that relatively large infestation densities of the psyllid developed on conventional Citrus (Rutaceae) and citrange (Rutaceae) cultivars but not on any of 6 Poncirus trifoliata (L.
Mudas enxertadas em tangerineira 'Sunki tropical' apresentam maior crescimento vegetativo de parte aerea e de sistema radicular em combinacao com todas as copas estudadas, apresentando desempenho superior ao de plantas sobre limoeiro 'Cravo Santa Cruz' e hibridos de limoeiro 'Cravo' e de Poncirus trifoliata.
Efeito da umidade, temperatura de estocagem e duracao da estocagem sobre a germinacao de Poncirus trifoliata e de outros porta-enxertos de citrus.
A recent experiment showed that exogenous PAs (100 mg L-1), especially Put, obviously increased AM colonization of Glomus versiforme-colonized Poncirus trifoliata (Wu and Zou, 2009).
Construction of linkage maps of Poncirus trifoliata and Citrus sunki based on microsatellite markers.
O experimento foi executado no Centro de Formacao da Emater/Ascar, situado no municipio de Montenegro, Rio Grande do Sul (RS), sendo utilizado pomar de plantas de laranjeira 'Valencia' enxertadas sobre Poncirus trifoliata (L.
Osbeck x Poncirus trifoliata e apresentam caracteristicas semelhantes as do Trifoliata, como o porte reduzido, a tolerancia ao frio e a inducao de frutos de boa qualidade (SCHAFER, 2004).
Tais avaliacoes visuais basearam-se, em parte, na presenca de folhas trifolioladas (folhas compostas de tres foliolos), caracteristica dominante relacionada a Poncirus trifoliata, dado que a quase totalidade dos parentais masculinos compreendeu hibridos envolvendo essa especie, sendo excecao C.