Effect of nutri-priming on germination indices and physiological characteristics of stevia seedling under salinity stress

Shahverdi, Mehdi Aghighi; Omidi, Heshmat; Tabatabaei, S J

doi:10.1590/2317-1545v39n4172539

Cited by 29 publications

(34 citation statements)

References 27 publications

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“…The application of Se supplementation exhibited no significant effect on chl a and b or carotenoids in sugarcane [ 74 ], in oilseed rape [ 75 ], or in wheat [ 76 ] under control conditions. Stevia seeds primed with sodium selenite, developed seedlings with similar total chlorophyll content to control plants [ 77 ]. The lack of chlorophyll and carotenoid loss in Stevia leaves indicates that the applied Se concentrations were not toxic to the plants [ 78 ].…”

Section: Resultsmentioning

confidence: 99%

The Effect of Foliar Selenium (Se) Treatment on Growth, Photosynthesis, and Oxidative-Nitrosative Signalling of Stevia rebaudiana Leaves

et al. 2021

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Selenium (Se) enrichment of Stevia rebaudiana Bertoni can serve a dual purpose, on the one hand to increase plant biomass and stress tolerance and on the other hand to produce Se fortified plant-based food. Foliar Se spraying (0, 6, 8, 10 mg/L selenate, 14 days) of Stevia plantlets resulted in slightly decreased stevioside and rebaudioside A concentrations, and it also caused significant increment in stem elongation, leaf number, and Se content, suggesting that foliar Se supplementation can be used as a biofortifying approach. Furthermore, Se slightly limited photosynthetic CO2 assimilation (AN, gsw, Ci/Ca), but exerted no significant effect on chlorophyll, carotenoid contents and on parameters associated with photosystem II (PSII) activity (FV/FM, F0, Y(NO)), indicating that Se causes no photodamage in PSII. Further results indicate that Se is able to activate PSI-cyclic electron flow independent protection mechanisms of the photosynthetic apparatus of Stevia plants. The applied Se activated superoxide dismutase (SOD) isoenzymes (MnSOD1, FeSOD1, FeSOD2, Cu/ZnSOD1, Cu/ZnSOD2) and down-regulated NADPH oxidase suggesting the Se-induced limitation of superoxide anion levels and consequent oxidative signalling in Stevia leaves. Additionally, the decrease in S-nitrosoglutathione reductase protein abundance and the intensification of protein tyrosine nitration indicate Se-triggered nitrosative signalling. Collectively, these results suggest that Se supplementation alters Stevia shoot morphology without significantly affecting biomass yield and photosynthesis, but increasing Se content and performing antioxidant effects, which indicates that foliar application of Se may be a promising method in Stevia cultivation.

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Section: Resultsmentioning

confidence: 99%

The Effect of Foliar Selenium (Se) Treatment on Growth, Photosynthesis, and Oxidative-Nitrosative Signalling of Stevia rebaudiana Leaves

et al. 2021

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“…As can be seen in Table 3, at all drought stress levels, the highest values of GP, GV as well as SL and SVI were noticed in seeds primed by SA + Fe + Zn. The reason of the increment in seedling weight and length as a result of nutri-priming might be due to the role of these elements in increased cell division, cell expansion and meristematic growth, which caused an increase of plant growth (Shahverdi et al, 2017). It has been reported that in the presence of zinc, hormones such as auxin are increased.…”

Section: Discussionmentioning

confidence: 99%

“…The limitation of this element has a remarkable effect on the productivity of photosynthetic organisms (Tewari et al, 2013). Shahverdi et al (2017) reported that stevia seed priming with Fe alone and the integrated application of selenium (Se) and boron (B) significantly increased the total Chl content under salinity stress. In another research, Li and Zhang (2012) concluded that rice seed priming with SA increases the photosynthetic activities in this plant.…”

Section: Discussionmentioning

confidence: 99%

“…The sweetness of the stevia plant is related to the presence of ent-kaurene-type diterpene glycosides (stevioside and rebaudiosides), which can be 300 times sweeter than sucrose (Hajihashemi and Ehsanpour, 2014;Aghighi Shaverdi et al, 2018). Since the sweet herb has self-incompatible flowers, its pollination is probably carried out by insects and wind (Ucar et al, 2016;Shahverdi et al, 2017). As a result, stevia produces often few pollinated flowers which have low germination percentage and poor establishment (Yadav et al, 2011;Lemus-Mondaca et al, 2012 capacity of stevia continues to be a major impediment for the plantation of this plant on a large-scale (Abdullateef et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

“…Among various priming techniques, seed priming with micronutrients (nutri-priming) has been reported to be a physiological beneficial method for overcoming the micronutrient deficiency in seeds which improves seedling emergence (Farooq et al, 2012). Various studies have revealed that this technique significantly improves germination rate, seed quality, early seedling growth and stress tolerance in different plants (Mirshekari et al, 2012;Imran et al, 2017;Shahverdi et al, 2017;Reis et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Morpho-Physiological Responses of Stevia (Stevia Rebaudiana Bertoni) to Various Priming Treatments Under Drought Stress

Gorzi¹,

Omidi²,

Bostani³

2018

Appl. Ecol. Env. Res.

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Poor germination capacity of stevia is a major problem in its cultivation. Moreover, drought stress is one of the most major environmental constraints, which influences seed germination and early seedling growth of many crops. The aim of this research was to evaluate the impact of seed priming with salicylic acid (SA), zinc (Zn) and iron (Fe) on some germination parameters and physiological attributes of stevia seedlings under drought stress induced by polyethylene glycol (PEG) 6000 (0, -3, -6 and -9 bars). The results revealed that germination traits (germination percentage, germination rate, mean germination time, germination value, seedling length, and seedling vigor index) and chlorophyll (Chl) content were negatively affected by drought stress. However, the reduction of germination parameters in seedlings exposed to drought stress in most cases was moderated by seed priming, which also increased the Chl content at all levels of drought stress as compared with the control. Drought stress also increased the proline accumulation and the enzymatic activity of catalase (CAT) and peroxidase (POD) in all priming treatments, but these enhancements were significantly higher in primed seedlings than those in unprimed ones. Among all priming treatments, priming with SA + Fe + Zn was found to be more effective than other treatments to improve growth and physiological characteristics under normal and drought stress conditions. Thus, we suggest that seed priming with SA, Fe, Zn and particularly the integrated application of these three agents at a suitable concentration can promote the poor germination performance of stevia and improve the seedling growth by increasing the antioxidant capacity under drought conditions.

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Improving the foliar biofortification of broccoli with selenium without commercial quality losses

et al. 2021

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Selenium‐biofortified broccoli (Brassica oleracea L. var. italica Plenck) is an important source of micronutrients in a healthy human diet. Therefore, studies are needed on the commercial production of selenium‐enriched broccoli. We analyzed the effect of the foliar application of sodium selenate and sodium selenite in doses of 50 and 100 g ha−1 on the growth, photosynthetic parameters, selenium accumulation, and commercial quality of broccoli in two cultivars (‘Belstar’ and ‘Legend’) used for fresh crops market grown under field conditions. The application of both doses of selenate and the highest dose of selenite induced a significant increase in the head fresh weight (FW) only in cultivar Belstar. However, the dry matter content of the heads was not significantly affected by selenium or the cultivar of broccoli. In addition, the increase in the water use efficiency, mainly due to the reduction of the transpiration rate, could explain the significant increase in the head FW without modifying the head dry matter content in Belstar. On the other hand, selenium treatments before harvest maintained the green color and did not affect the firmness and diameter of the heads at harvest. The selenium content of the heads increased markedly in a dose‐dependent manner in both cultivars, with both selenium treatments. The results of this study indicate that the response to selenium treatments differs between broccoli cultivars and that the use of both selenium salts in foliar form would be a good strategy to obtain selenium‐enriched broccoli, without affecting the commercial quality of the heads.

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Effect of nutri-priming on germination indices and physiological characteristics of stevia seedling under salinity stress

Cited by 29 publications

References 27 publications

The Effect of Foliar Selenium (Se) Treatment on Growth, Photosynthesis, and Oxidative-Nitrosative Signalling of Stevia rebaudiana Leaves

The Effect of Foliar Selenium (Se) Treatment on Growth, Photosynthesis, and Oxidative-Nitrosative Signalling of Stevia rebaudiana Leaves

Morpho-Physiological Responses of Stevia (Stevia Rebaudiana Bertoni) to Various Priming Treatments Under Drought Stress

Improving the foliar biofortification of broccoli with selenium without commercial quality losses

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