Effects of water stress on growth, yield, quality and physiological responses of two stevia (Stevia rebaudiana Bertoni) varieties in Rabat region, Morocco
Journal Title: Asian Journal of Agriculture and Biology - Year 2018, Vol 6, Issue 1
Abstract
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.
Authors and Affiliations
Abderrahmane Benhmimou
Keywords
Related Articles
- EP ID EP604173
- DOI -
- Views 129
- Downloads 0
Splitting of nitrogen application through growth stages in various sunflower cultivars to improve their vegetative growth and seed yield
A field experiment was carried out in spring seasons of 2012 and 2013 to increase the efficiency of nitrogen application in spite of that no splitting nitrogen has practiced for the studied cultivars. Five splitting trea...
Influence of copper and lead on germination of three Mimosoideae plant species
Contamination with heavy metals is a critical problem facing large areas of agricultural soils. Seed, a developmental stage, is considered highly protective against environmental stresses. This study aimed to examine the...
The impact of organophosphorus pesticide on Solanum melongena, Capsicum annum and Soil
Eggplant (Solanum melongena) and green chilli (Capsicum annum) are an important vegetables crop grown throughout the year in the India. However, these vegetables crops suffer heavily from the ravages of various insect pe...
First record of the crown rot fungus Fusarium equiseti affecting Triticum aestivum L. and Aptenia cordifolia in Iraq
During growing seasons of 2015 and 2016, severe rot symptoms were noticed epidemiologically on root and crown of Triticum aestivum and Aptenia cordifolia seedlings in Kerbala Province, Iraq. Thus, the aims of this resear...
Pathogenic activity of Fusarium equiseti from plantation of Citrus Plants (Citrus nobilis) in the village Tegal Wangi, Jember Umbulsari, East Java, Indonesia
Some fungi associate with fruit and dead or dying plant tissues as pathogen on a wide range of agricultural plants. This work comprised the isolation, identification and pathogenic assay from citrus fruit plantations (Ci...