changed placing the style-end facing upward also developed YSD. At the end of the growing period,
the area of fruits with YSD was reduced and the border line between the yellow and red fruit areas
became diffuse.
The above results clearly indicate that high temperature alone cannot explain incidence of
YSD. Results of winter-time experiments and aluminum foil treatment strongly suggest that solar
radiation and/or light quality may play an essential role in YSD.
Literature Cited
López-Casado, G. 2002. Mancha solar en fruto de tomate: análisis de carotenoides y estudio
histológico. Tesis de Licenciatura, Universidad de Málaga, Spain, 77 pp.
Picha, D.H. 1987. Physiological factors associated with yellow shoulder expression in tomato fruit.
J. Amer. Soc. Hort. Sci. 112: 798-801.
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