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首页> 外文期刊>Acta Horticulturae >The effect of temperature on olive pollen germination
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The effect of temperature on olive pollen germination

机译：温度对橄榄花粉萌发的影响

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摘要

Temperature is an important factor controlling plant growth and development. The reproductive phase has proven to be one of the most temperature sensitive stages in plants. Pollen grains, once released from anthers, act as independent functional unitsand are exposed to the ambient environment. Therefore, temperature shifts during flowering may severely affect pollen germination and be correlated with low fertilization. In addition, optimum temperature for pollen germination depends on the species and often varies even between cultivars. In this study, the effect of temperature on pollen performance was evaluated in olive (Olea europaea L.), comparing four cultivars ('Leccino', 'Levantinka', 'Oblica', and 'Pendolino') as pollen donors. We expected different responses to temperatures between cultivars considering their different origin. Germination was evaluated on germination medium in controlled-temperature chambers after 24 h at 15, 20, 25, 30, and 35°C. Pollen-germination range was 4.8-19.6% in'Leccino', 8.1-31.1% in 'Levantinka', 4.2-25.4% in 'Oblica' and 7.7-37.9% in 'Pendolino'. A significant quadratic relation between pollen germination and temperature was found for all cultivars. Peak values that indicated optimum temperature for pollengermination varied between cultivars. In general, the increasing temperatures up to 30°C accelerated the pollen tube growth and increased germination rate; however, rates were significantly lower at 35°C with more frequently bursting of pollen tubes. These results indicate differences in genotype response to temperature during the reproductive phase, which could be important information for plant breeders towards producing new tolerant olive cultivars.
机译：温度是控制植物生长和发育的重要因素。生殖阶段已被证明是植物中最温度敏感阶段之一。一旦从花树释放，花粉颗粒就像独立的功能单位一样接触到环境环境。因此，开花期间的温度偏移可能严重影响花粉萌发，并与低施肥相关。此外，花粉萌发的最佳温度取决于物种，甚至在品种之间通常也变化。在这项研究中，在橄榄（Olea Europaea L）中评估了温度对花粉性能的影响，比较了四种品种（'leccino'，'Levantinka'，'oflica'和'pendolino'）作为花粉捐献者。考虑到他们不同的起源，我们预期对品种温度的不同反应。在24小时后在15,20,25,30和35℃下在受控温室的萌发培养基上评价萌发。花粉萌发范围为4.8-19.6％，'Levantinka'，8.1-31.1％，'Pendolino'的'offlica'和7.7-37.9％。对所有品种发现花粉萌发和温度之间的显着二次关系。在品种之间表现出最佳温度的峰值。品种之间的变化变化。一般来说，高达30°C的温度越来越高，加速了花粉管的生长和提高萌发率;然而，在35℃下，速率显着降低，花粉管更频繁地爆裂。这些结果表明生殖期期间对温度的基因型应对的差异，这可能是植物育种者对生产新的耐橄榄品种的重要信息。

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