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Callery pear ( Pyrus calleryana ) was brought to the United States in the early 1900s for grafting onto fruit-producing european pear ( Pyrus communis ) trees to aid in fire blight management efforts ( Culley and Hardiman, 2007 ). Although this

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Pear ( Pyrus spp.) is one of the most important fruit crops of the Rosaceae family, ranking second to apple ( Malus × domestica ) in world and European production of pome fruit tree species ( Food and Agriculture Organization of the United

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exudates. Materials and Methods Extraction procedure. Stigma exudates were collected from flowers of pear ( Pyrus communis L.) and apple ( Malus pumila P. Mill.) in 2003 and 2004. Tree cultivars were ‘Anjou’ and ‘Bartlett’ pear and ‘Fuji

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Abstract

Acetaldehyde is produced in fruit of pear (Pyrus communis L.) and can stimulate ripening. The action of selective inhibitors indicates that acetaldehyde operates independently of ethylene.

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Abstract

‘Honeysweet’ is a new, high quality pear (Pyrus communis L.) with resistance to fire blight caused by Erwinia amylovora (Burr.) Winslow et al.

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Pear ( Pyrus sp.) is one of the most important fruit trees in temperate regions around the world. More than 60% of the world’s pears are produced in China ( Huang et al., 2009 ). Chinese white pear ‘Dangshansuli’ originated in China and is the most

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involved in fruit growth. Materials and Methods Plant materials and fruit growth. Seven 12-year-old japanese pear trees with uniform vigor from both cultivars, Atago and Shinkou, grafted onto Pyrus betulaefolia Bunge rootstocks were selected

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country, China grows more than 60% of the world pear ( Pyrus sp.) production ( Boyer et al., 1943 ; Wu et al., 2013 ). K is highly mobile in plants and constitutes up to 10% of plant dry weight ( Adams and Shin, 2014 ; Shin, 2014 ; Walker et al., 1996

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test-crosses. Classical descriptions of S-phenotypes were well known for apple ( Malus × domestica Borkh.) ( Kobel et al., 1939 ), sweet cherry ( Prunus avium L.) ( Crane and Brown, 1937 ), japanese pear ( Pyrus pyrifolia L.) [Terami et al., (1946

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flowering. Sink strength of newly expanding leaves for assimilates was greater than developing japanese pears ( Pyrus pyrifolia Nakai) within 30 dafb ( Zhang et al., 2005 ). Apple leaves similarly compete with developing fruit. Hansen (1971) determined

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