Articles
HEAT TOLERANCE IN TOMATO PLANTS
Article number
190_61
Pages
531 – 532
Language
Abstract
An understanding of physiological and genetic factors limiting yield and quality under high temperature, is important in view of cultivars for tropical and subtropical climates.
Exposure of most cultivars to 30/20°C day/night temperature prevents fruit set, as little as 3 hr exposure to 40°C can cause blossom-drop in most cultivars.
High temperature fruit set is related to adaptability problems in tomato.
Most cultivars with superior high temperature fruit set capability were developed in regions where it is difficult to produce tomatoes.
The essential processes for fruit set are: production of viable pollen, pollen dehiscence, style elongation in response to temperature, ovule viability.
In all this characteristics large genetic variability was found.
Carbohydrate stress at high temperature is an important contributing factor in flowerdrop.
The inhibition of carbon fixation and carbon transport as a response to heat stress, was demonstrated in tomato plants.
The reduction of photosynthesis and translocation was more pronounced in a heat sensitive cultivar than in a heat resistant cultivar.
These factors are discussed in relation to the potential for developing cultivars that will set fruit during the hottest temperature encounter in prevalent tomato production areas.
Exposure of most cultivars to 30/20°C day/night temperature prevents fruit set, as little as 3 hr exposure to 40°C can cause blossom-drop in most cultivars.
High temperature fruit set is related to adaptability problems in tomato.
Most cultivars with superior high temperature fruit set capability were developed in regions where it is difficult to produce tomatoes.
The essential processes for fruit set are: production of viable pollen, pollen dehiscence, style elongation in response to temperature, ovule viability.
In all this characteristics large genetic variability was found.
Carbohydrate stress at high temperature is an important contributing factor in flowerdrop.
The inhibition of carbon fixation and carbon transport as a response to heat stress, was demonstrated in tomato plants.
The reduction of photosynthesis and translocation was more pronounced in a heat sensitive cultivar than in a heat resistant cultivar.
These factors are discussed in relation to the potential for developing cultivars that will set fruit during the hottest temperature encounter in prevalent tomato production areas.
Publication
Authors
J. Rudich
Keywords
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