Effects of zinc application on the growth and photosynthetic characteristics of pecan at the seedling stage

Liu, Junping; Deng, Qiyun; Shang, Yangjuan; Yao, Xiuwen; Wang, H.-K.; Tang, Yujie; Peng, Fei; Tan, Pengpeng

doi:10.1111/plb.13307

Cited by 9 publications

(5 citation statements)

References 38 publications

(58 reference statements)

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“…In group C, which was treated with zinc twice, varying zinc concentrations did not significantly influence the photosynthetic parameters of the ginkgo plants. This finding contrasts with a study by Lui et al [47], which suggested that excessive zinc could hinder plant photosynthesis. This discrepancy could be attributed to the possibility that pecans are more susceptible to zinc [48].…”

Section: Discussioncontrasting

confidence: 98%

Zinc-Enhanced Regulation of the Ginkgo biloba L. Response and Secondary Metabolites

Zhang,

Luo,

Hou

et al. 2024

Forests

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Ginkgo biloba L. leaves are rich in secondary metabolites with important medicinal values; to increase their contents, foliar spraying of micronutrients is a potential strategy. Zinc, a multifunctional element, has a significant impact on the content of secondary metabolites in other plants, but relevant research into ginkgo is still lacking. In our study, different spraying time and concentration strategies were used to investigate the effects of zinc sulfate (ZnSO4) on physiological indicators and secondary metabolites of 2-year-old ginkgo. The results demonstrated that ZnSO4 could increase the contents of hydrogen peroxide, abscisic acid, and free amino acids in ginkgo leaves. It also enhances the antioxidant enzyme activity of ginkgo leaves, decreases the content of plant auxin, and ultimately facilitates the accumulation of ginkgo terpene lactones (TTL). Spraying ZnSO4 in June resulted in a more significant increase in the contents of TTL and flavonoids compared to spraying in August. After spraying 12 mmol/L ZnSO4 in June, the contents of TTL and flavonoids in ginkgo leaves were significantly elevated by 35.95% and 24.30%, respectively, compared to those in the CK (p < 0.05). The contents of ginkgolide A, B, and C were notably increased by 45.93%, 46.56%, and 74.29%, respectively, compared to those in the CK (p < 0.05). Therefore, our study suggests that the optimal timing for spraying ZnSO4 on ginkgo is in June, with a recommended concentration of 12 mmol/L. Our study provides a theoretical basis for the accumulation of secondary metabolites in ginkgo and guides the production of its leaf-utilization plantations.

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Section: Discussioncontrasting

confidence: 98%

Zinc-Enhanced Regulation of the Ginkgo biloba L. Response and Secondary Metabolites

Zhang,

Luo,

Hou

et al. 2024

Forests

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“…Magnesium is the principal component of the tetrapyrrole ring of chlorophyll molecule [ 89 ], and excess Zn application has been documented to decrease chlorophyll content [ 90 ]. The decreased chlorophyll content reported for S. sclarea plants exposed to 900 μM Zn for 8 days [ 7 ] can be attributed to the decreased Mg content in the aboveground tissues that was observed ( Table 1 ).…”

Section: Discussionmentioning

confidence: 99%

A Hormetic Spatiotemporal Photosystem II Response Mechanism of Salvia to Excess Zinc Exposure

Moustakas

Dobrikova

Sperdouli

et al. 2022

IJMS

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Exposure of Salvia sclarea plants to excess Zn for 8 days resulted in increased Ca, Fe, Mn, and Zn concentrations, but decreased Mg, in the aboveground tissues. The significant increase in the aboveground tissues of Mn, which is vital in the oxygen-evolving complex (OEC) of photosystem II (PSII), contributed to the higher efficiency of the OEC, and together with the increased Fe, which has a fundamental role as a component of the enzymes involved in the electron transport process, resulted in an increased electron transport rate (ETR). The decreased Mg content in the aboveground tissues contributed to decreased chlorophyll content that reduced excess absorption of sunlight and operated to improve PSII photochemistry (ΦPSII), decreasing excess energy at PSII and lowering the degree of photoinhibition, as judged from the increased maximum efficiency of PSII photochemistry (Fv/Fm). The molecular mechanism by which Zn-treated leaves displayed an improved PSII photochemistry was the increased fraction of open PSII reaction centers (qp) and, mainly, the increased efficiency of the reaction centers (Fv′/Fm′) that enhanced ETR. Elemental bioimaging of Zn and Ca by laser ablation–inductively coupled plasma–mass spectrometry (LA–ICP–MS) revealed their co-localization in the mid-leaf veins. The high Zn concentration was located in the mid-leaf-vein area, while mesophyll cells accumulated small amounts of Zn, thus resembling a spatiotemporal heterogenous response and suggesting an adaptive strategy. These findings contribute to our understanding of how exposure to excess Zn triggered a hormetic response of PSII photochemistry. Exposure of aromatic and medicinal plants to excess Zn in hydroponics can be regarded as an economical approach to ameliorate the deficiency of Fe and Zn, which are essential micronutrients for human health.

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“…Excessive Zn supply in plants may impair plant growth, disturb chlorophyll synthesis, and induce nutrient imbalances [14,84]. Excess Zn supply (>300 µM) has been reported to reduce chlorophyll [3,14,29,84,85] and either sustain photosynthetic efficiency [84], enhance photosynthetic function [3,14], or restrict it [29]. The reduced chlorophyll in S. sclarea plants that was observed after exposure to 900 µM Zn for 8 days (Figure 3a) could be attributed to Mg decline (Figure 1b).…”

Section: Discussionmentioning

confidence: 95%

Photosystem II Tolerance to Excess Zinc Exposure and High Light Stress in Salvia sclarea L.

Moustakas,

Dobrikova,

Sperdouli

et al. 2024

Agronomy

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High light (HL) intensity has a substantial impact on light energy flow and partitioning within photosynthetic apparatus. To realize the impact of HL intensity on zinc (Zn) tolerance mechanisms in clary sage (Salvia sclarea L., Lamiaceae) plants, we examined the effect of the altered chlorophyll and nutrient uptake under excess Zn supply on the response mechanism of photosystem II (PSII) photochemistry. Eight-week-old clary sage plants were treated with 5 μM Zn (control) or 900 μM Zn in Hoagland nutrient solution. Leaf elemental analysis for Zn, Mn, Mg, and Fe was performed by inductively coupled plasma mass spectrometry (ICP-MS), whereas PSII functioning under HL was evaluated by chlorophyll fluorescence imaging analysis. Exposure of S. sclarea plants to 900 μM Zn increased leaf Zn accumulation and decreased leaf Mg and chlorophyll. The decreased non-photochemical quenching (NPQ) provided evidence of the photoprotection offered by the smaller light-harvesting antennae due to the reduced chlorophyll. The increased Mn after Zn exposure corresponded with higher efficiency of the oxygen-evolving complex (OEC) that was significantly correlated with the maximum efficiency of photosystem II (PSII) photochemistry (Fv/Fm). An increased electron transport rate (ETR) coincided with increased leaf Fe, which is known to play a vital role in the enzymes engaged in ETR. The decreased (32%) NPQ after an 8-day exposure to Zn caused an increased (10%) quantum yield of non-regulated energy loss in PSII (ΦNO), indicative of an increased singlet oxygen (1O2) production. It is suggested that the decreased NPQ induced acclimation responses of clary sage plants to HL and excess Zn by increasing 1O2 production. The reduced (18%) excess excitation energy (EXC) at PSII and the increased (24%) quantum yield of PSII photochemistry (ΦPSII) and ETR indicated improved photosynthetic efficiency under excess Zn and HL intensity. Therefore, the exposure of medicinal plants to excess Zn not only boosts their photosynthetic efficiency, enhancing crop yields, but can also improve Fe and Zn content, ameliorating the human health deficiency of these two essential micronutrients.

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Effects of zinc application on the growth and photosynthetic characteristics of pecan at the seedling stage

Cited by 9 publications

References 38 publications

Zinc-Enhanced Regulation of the Ginkgo biloba L. Response and Secondary Metabolites

Zinc-Enhanced Regulation of the Ginkgo biloba L. Response and Secondary Metabolites

A Hormetic Spatiotemporal Photosystem II Response Mechanism of Salvia to Excess Zinc Exposure

Photosystem II Tolerance to Excess Zinc Exposure and High Light Stress in Salvia sclarea L.

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