The number of days to ripening (DTR) was less at 30/25 8C
than at 23/18 8C in both cultivars, irrespective of fruit position
(Table 3). The stimulating effect of higher temperatures on fruit
ripening has also been reported for ‘Morioka 16’ strawberries
grown between 15 8C and 35 8C (Kumakura and Shishido,
1994). On the other hand, Mori (1998) reported that DTR was
not significantly different among three temperature treatments
(16/11 8C, 20/15 8C, and 24/19 8C) for both ‘Nyoho’ and
‘Toyonoka’. This is probably because the day/night temperatures
used by Mori were still within the optimum range for the
growth of strawberry fruits. Forney and Breen (1985) and Miura
et al. (1994) reported that DTR in strawberry fruits increased
with fruit position; that is, primary fruits ripened faster than
fruits in succeeding positions. The results in our study are in
accordance with their observations.
The number of days to ripening (DTR) was less at 30/25 8Cthan at 23/18 8C in both cultivars, irrespective of fruit position(Table 3). The stimulating effect of higher temperatures on fruitripening has also been reported for ‘Morioka 16’ strawberriesgrown between 15 8C and 35 8C (Kumakura and Shishido,1994). On the other hand, Mori (1998) reported that DTR wasnot significantly different among three temperature treatments(16/11 8C, 20/15 8C, and 24/19 8C) for both ‘Nyoho’ and‘Toyonoka’. This is probably because the day/night temperaturesused by Mori were still within the optimum range for thegrowth of strawberry fruits. Forney and Breen (1985) and Miuraet al. (1994) reported that DTR in strawberry fruits increasedwith fruit position; that is, primary fruits ripened faster thanfruits in succeeding positions. The results in our study are inaccordance with their observations.
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