The climate where fruit is grown can affect many different aspects of growth and development, including shape. Several reports have been published for fruit other than peaches concerning climatic and temperature effects on fruit shape. In general, higher temperatures tend to produce rounder fruit and lower temperatures tend to produce fruit that are more elongated (Sherman et al., 2003). Fruit elongation of grapefruit, known as “sheepnosing” or “stem end tapering,” occurs when plants are exposed to low temperatures (Wutscher, 1976). Other citrus fruit such as oranges and lemons are rounder when grown in warmer areas versus cooler areas (Nauer et al., 1972, 1974). Pepper fruit shape was influenced by temperatures during fruit development, where fruit grown at low night temperatures of 12 °C were flatter than fruits grown at 18 °C (Aloni et al., 1999; Rylski and Spigelman, 1982).
The stylar tip of peach fruit can be affected by temperature. More protruding tips have been observed in warmer locations and recessed or flush tips in cooler locations (Salvador et al., 1998; Topp and Sherman, 1989). An analysis of peach fruit quality at 13 locations in Australia indicated that higher average temperatures during the coldest month (July) increased tip growth of fruit for most cultivars (Topp and Sherman, 1989).
Aloni, B., Pressman, E. & Karni, L. 1999 The effect of fruit load, defoliation and night temperature on the morphology of pepper flowers and on fruit shape Ann. Bot. (Lond.) 83 529 534
Koffmann, W. & Patten, A.R. 1992 Assessment of low chill peach and nectarine cultivars in the central coast of New South Wales, Australia Fruit Varieties Journal 46 119 124
Nauer, E.M., Goodale, J.H., Summers, L.L. & Reuther, W. 1974 Climate effects on mandarins and Valencia oranges California Agriculture 28 8 10
Rouse, R.E. & Sherman, W.B. 1989 Low-chill peaches in south Texas and potential in central Florida Proc. Fla. State Hort. Soc. 102 193 195
Rylski, I. & Spigelman, M. 1982 Effects of different diurnal temperature combinations of fruit set of sweet pepper Scientia Hort. 17 101 106
Salvador, M.E., Lizana, L.A., Luchsinger, L.E., Alonso, E. & Loyola, E. 1998 Locality effect on some fruit quality parameters in peaches and nectarines Acta Hort. 465 447 454
Topp, B.L. & Sherman, W.B. 1989 Location influences on fruit traits of low-chill peaches in Australia Proc. Fla. State Hort. Soc. 102 195 199