PaperRSS文献速递|高温胁迫下加工番茄品种间产量和花粉生活力的差异
发生的气候变化正在导致全球农作物生产地区的温度升高，从而产生了热应激条件，对作物生产力产生了负面影响。 番茄（Solanum lycopersicum）是一种主要的蔬菜作物，对高温胁迫非常敏感。 当番茄植物在生殖阶段暴露于昼夜环境温度分别超过32°C / 20°C时，坐果和果实重量都会减少，从而导致产量显着下降。 加工番茄栽培品种在不控制环境条件的开阔田地上种植，因此，植物面临多种非生物胁迫，包括热胁迫。 了解现代加工番茄品种对热胁迫的生理反应可能会促进耐热品种的发展。
本研究，我们比较了两个番茄加工品种H4107和H9780，我们发现它们在产量上一直存在差异。 使用田间和温控温室实验，我们表明观察到的产量差异归因于热应激条件的发生。
此外，与H9780相比，耐热品种H4107的坐果和种子产量显着提高。 尽管人们普遍接受花粉生存力作为耐热性的度量标准，但在任何一种测试条件下，H4107和H9780之间的花粉存活率百分比均没有差异。
因此，加工番茄品种可能会出现一个特殊的情况，其中其他因素对于热胁迫的耐受性至关重要。 我们的结果还证明了将受控与不受控制的实验设置相结合的价值，以识别与热胁迫相关的响应并促进耐热加工番茄品种的发展。
The occurring climate change is causing temperature increment in crop production areas worldwide, generating conditions of heat stress that negatively affect crop productivity. Tomato (Solanum lycopersicum), a major vegetable crop, is highly susceptible to conditions of heat stress. When tomato plants are exposed to ambient day/night temperatures that exceed 32°C/20°C respectively during the reproductive phase, fruit set and fruit weight are reduced, leading to a significant decrease in yield. Processing tomato cultivars are cultivated in open fields, where environmental conditions are not controlled, therefore plants are exposed to multiple abiotic stresses, including heat stress. Understanding the physiological response of modern processing tomato cultivars to heat stress may facilitate the development of thermotolerant cultivars. Here, we compared two tomato processing cultivars, H4107 and H9780, that we found to be constantly differing in yield performance. Using field and temperature-controlled greenhouse experiments, we show that the observed difference in yield is attributed to the occurrence of heat stress conditions. In addition, fruit-set and seed production were significantly improved in the thermotolerant cultivar H4107, compared with H9780. Despite the general acceptance of pollen viability as a measure of thermotolerance, there was no difference in the percentage of viable pollen between H4107 and H9780 under either of the conditions tested. Therefore, processing tomato cultivars may present a particular case, in which other factors are central for heat stress tolerance. Our results also demonstrate the value of combining controlled with uncontrolled experimental settings, in order to identify heat stress-related responses and facilitate the development of thermotolerant processing tomato cultivars.
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