ISHS Acta Horticulturae 434: Strategies for Market Oriented Greenhouse Production
EFFECT OF DIFFERENT TEMPERATURE REGIMES ON HETEROSTYLOUS CONDITION AND POLLEN GRAIN VIABILITY OF TOMATO |
| Authors: | S.O. El-Abd, M.S. El-Beltagy |
| Abstract:
In one experiment, two tomato varieties (Alicante and UC 82) were grown at two temperature regimes (35/24°C or 20/16°C). In other experiment, four tomato varieties (cold-set, Flodrel, UC 82 and Castle long) were grown at three temperature regimes (35/24°C, 20/16°C and 10/5°C). High temperature regime (35/24°C) stimulated heterostylous condition i.e., promoted stigma exertion. Such effect was more pronounced in variety Alicante relative to UC 82 in the first experiment. In the second experiment such phenomenon was more evident in varieties Cold-set and Floradel relative to UC 82 and Castle long. Flowers of the four varieties which were produced at low temperature regime (10/5°C) were bigger in size relative to other regimes. Pollen grain of different varieties grown at either the high (35/24°C) and /or the low temperature (10/5°C) regimes showed the features of low viability relative to the regime (20/16°C) as determined by the coloration of pollen grain using pollen stain mixture. Moreover, the high temperature regime (35/24°C) reduced in vitro pollen grain germination relative to the regime (20/16°C). | |
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