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首页> 外文期刊>Scientia horticulturae >Effects of solar UV-B radiation exclusion on physiology, growth and yields of taro (Colocasia esculenta (L.)) at different altitudes in tropical environments of Southern Ethiopia
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Effects of solar UV-B radiation exclusion on physiology, growth and yields of taro (Colocasia esculenta (L.)) at different altitudes in tropical environments of Southern Ethiopia

机译：太阳能UV-B辐射排除对埃塞俄比亚热带环境中芋头（Colocasia Esculenta（L.））生理学，生长和产量的影响

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摘要

Plants are sessile by nature, they have to be able to cope with exposure to many biotic and abiotic stress factors, including solar UV-B radiation. The degree of stresses varies with geographic locations. The impact of solar UV radiation on growth, physiology and yield of taro (Colocasia esculenta (L.)) at different altitudes under tropical environments was evaluated in Southern Ethiopia at 1500 m, 1800 m and 2200 m a.s.l. The experiment was conducted under open field conditions, and was compared to the yield of taro under UV-B blocking plastic film at every location. Four taro cultivars ('Black', 'Boloso-1', 'Purple' and 'White') were used as planting materials. Each treatment was planted using RCB design with three replications. The result indicates that leaf number, shoot number, leaf area and leaf area index under UV-B exclusion were found to be higher at higher elevation than either lower or middle elevation for 'Boloso-1' and 'Black' cultivars. Exclusion of UV-B spectrum from solar radiation improved the number of leaves and the leaf area index, for two cultivars: 'Black' and 'Boloso-1'. Blocking UV-B radiation also significantly enhanced stomata conductance, photosynthesis rate stomata opening area, stomata number and dry matter in 'Boloso-1', compared to other cultivars. However, physiologically 'Purple' cultivar did not respond to solar UV-B irradiation. Among all the cultivars, 'Boloso-1' was found to be a good candidate for maximum corm size, marketable and maximum total yield production in all test locations irrespective of solar UV-B irradiation. In conclusion, vegetative growth of taro cultivars responded better to altitudinal variation than variability of UV-B irradiation. Whereas, physiological parameters like stomata number, stomata opening area, stomata conductance and photosynthesis of different taro cultivars responded stronger to the level of UV-B irradiation than the altitude.
机译：植物自然界是无梗，他们必须能够应对许多生物和非生物胁迫因子，包括太阳能UV-B辐射。压力程度随着地理位置而变化。在埃塞俄比亚南部的1500米，1800米和2200米A.L.中评估了在热带环境下的不同海拔高度的芋头（Colocasia Esculenta（L.）的生长，生理学和产量）的影响在埃塞俄比亚南部，1800米和2200米A.L。该实验在开放的现场条件下进行，并与在每个位置的UV-B阻断塑料膜下芋头的产率进行比较。四种芋头品种（'黑色'，'Boloso-1'，'紫色'和'白色'）被用作种植材料。使用具有三种复制的RCB设计种植每种治疗。结果表明，在UV-B排除下的叶子数，射击数，叶面积和叶面积指数比“Boloso-1”和“黑色”品种的较低或中高度更高。从太阳辐射中排除UV-B频谱改善了叶片和叶面积指数的数量，适用于两种品种：“黑”和“Boloso-1”。与其他品种相比，阻断UV-B辐射也显着增强了“Boloso-1”中的气孔速率，光合速率气孔开口区域，气孔数量和干物质。然而，生理学上的“紫色”品种没有响应太阳能UV-B照射。在所有品种中，发现“博洛奥-1”是最大蜗壳尺寸，可销售和最大总产量的良好候选者，无论太阳能UV-B照射如何。总之，芋头品种的营养生长较好地响应于完全变化而不是UV-B照射的可变性。然而，不同芋头品种的气孔次数，气孔开口区域，气孔导电和光合作用的生理参数对UV-B照射的水平更强而不是高度。

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