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Ignasi Iglesias, Pere Vilardell, Joan Bonany, Elisabet Claveria, and Ramon Dolcet-Sanjuan

A new spontaneous mutation of the pear variety Dr. Jules Guyot, named `IGE 2002', was selected from a pear growing area in Catalonia. The clone was established in vitro from a 40-year-old tree, a highly recalcitrant material unable to root by cuttings. An in vitro micropropagation protocol, with an average multiplication rate of 5, a 90% rooting, and an acclimation of 79% of the plantlets, was defined. Self-rooted plants were grown in two experimental stations, covering two distinct fruit growing areas. The main agronomic characteristics of the clone `IGE 2002' were evaluated during six seasons, 1997 to 2002. Blooming and harvest period were at a similar time than `Dr. Jules Guyot'. Soluble solids concentration and acidity are also similar to `Dr. Jules Guyot'. However, at the same harvest time, a lower fruit firmness of `IGE 2002' in comparison to `Dr. Jules Guyot' indicated an advanced ripening. In addition, a finer flesh texture of `IGE 2002' than `Dr. Jules Guyot', distinguished the former from the later variety. Important differences between both plot sites were found on cumulative fruit yield, fruit size, and fruit size distribution, of `IGE2002' grown on its own roots. However, the site did not affect the fruit quality parameters. Superior fruit yields were associated with higher vigor and yield efficiency of the self-rooted variety.

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Thomas E. Marler

vs. selfish behaviors. Other potential issues for research include self vs. non-self root recognition, clonal vs. sibling root recognition and competition, and root exudates or volatile organic chemicals that comprise the arsenal of tools used for

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Wenjing Guan and Xin Zhao

al. (2006) reported that grafted melons had greater net photosynthetic rate than self-root plants. In the present study, neither g S nor chlorophyll content of the grafted plants was significantly different from that of the scion controls. With