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首页> 外文期刊>Asian Journal of Agriculture and Biology >Effects of water stress on growth, yield, quality and physiological responses of two stevia (Stevia rebaudiana Bertoni) varieties in Rabat region, Morocco
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Effects of water stress on growth, yield, quality and physiological responses of two stevia (Stevia rebaudiana Bertoni) varieties in Rabat region, Morocco

机译：水分胁迫对摩洛哥拉巴特地区两个甜叶菊（Stevia rebaudiana Bertoni）品种生长，产量，品质和生理响应的影响

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摘要

Since no information is available about the response of stevia (Stevia rebaudiana Bertoni) to water stress under Moroccan conditions. This study was aimed at evaluating the effects of water stress on growth, yield, quality and physiological responses of two stevia varieties (Canada and Candy). Three water regimes were applied: R100 (100% of field capacity (FC)), R80 (80% of FC) and R50 (50% of FC) as determined by pot weight. Water stress significantly reduced stomatal conductance (Gs), photosynthetic rate (A) and transpiration rate (E) by 72.50%, 78.54% and 74.45 % at R50, respectively as compared to R100. With the continuing of water stress time, plant allocated less plant height leading to reductions of 20.27% at R50 as compared to R100. All of the above responses led to reduced dry leaf yield. By contrast, the stevioside, rebaudioside A and total steviol glycoside contents were increased in R50 stevia leaves than R100 (23.58%, 13.50% and 11.73%, respectively). The cv Candy displayed a higher dry leaf yield (34.33 g/plant) and leaf physiological responses compared to cv Canada, which experienced a great decrease. By contrast, the cv Canada recorded a higher total steviol glycoside content (19.63%) than the cv Candy (12.63%). The interaction effects indicate that cv Candy, for R100, displayed a greater dry leaf and SG yields, while these parameters were greatly reduced under R80 and R50. By contrast, the cv Canada always showed a lower dry leaf and steviol glycoside yields and a greater total steviol glycoside contents, that enable it to have a better adaptation to water stress conditions. The variation of cv Canada and cv Candy responses to water stress suggested the higher adaptation of cv Canada to water stress compared to cv Candy.
机译：由于没有有关摩洛哥条件下甜叶菊（Stevia rebaudiana Bertoni）对水分胁迫的反应的信息。这项研究旨在评估水分胁迫对两种甜菊品种（加拿大和糖果）的生长，产量，品质和生理响应的影响。应用了三种供水方式：R100（田间灌溉量（FC）的100％），R80（FC的80％）和R50（FC的50％），取决于锅重。与R100相比，水分胁迫显着降低了R50的气孔导度（Gs），光合速率（A）和蒸腾速率（E）分别为72.50％，78.54％和74.45％。随着水分胁迫时间的持续，植物分配的植物高度降低，导致R50与R100相比降低了20.27％。所有上述响应导致干叶产量下降。相比之下，R50甜叶菊叶中的甜菊糖苷，莱鲍迪苷A和总甜菊醇糖苷含量比R100增加（分别为23.58％，13.50％和11.73％）。与加拿大简历相比，cv Candy显示出更高的干叶产量（34.33 g /株）和叶片生理响应。相比之下，加拿大简历录得的总甜菊醇糖苷含量更高（19.63％），高于糖果公司（12.63％）。相互作用的影响表明，对于R100，cv Candy显示出更大的干叶和SG产量，而在R80和R50下这些参数大大降低。相比之下，加拿大简历总是显示出较低的干叶和甜菊醇糖苷产量，以及更高的总甜菊醇糖苷含量，这使其能够更好地适应水分胁迫条件。加拿大cv和糖果对水分胁迫的响应差异表明加拿大糖果对水分胁迫的适应性高于糖果。

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