Neutral-to-positive cadmium effects on germination and seedling vigor, with and without seed priming

Carvalho, Marcia Eugenia Amaral; Agathokleous, Evgenios; Nogueira, Marina de Lima; Brunetto, Gustavo; Brown, Patrick H.; Azevedo, Ricardo Antunes

doi:10.1016/j.jhazmat.2023.130813

Cited by 14 publications

(3 citation statements)

References 118 publications

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“…Because Cd has strong affinity for sulfhydryl moiety of enzymes, it can affect plant metabolism by inhibiting enzyme activities [9]. Meanwhile, Cd absorption can disrupt nutrient uptake [10] and homeostasis [11] causing negative effects on physiology and morphology such as seed germination [12], seedling growth [12], chlorophyll degradation [13], photosynthesis inhibition [14], nitrogen metabolism [15], and plant biomass [16]. Interestingly, when Cd content exceeds a certain amount in plants, reactive oxygen species (ROS) formation is enhanced [15], including hydroxyl radicals (OH − ), superoxide radicals (O 2 − ), and hydrogen peroxide (H 2 O 2 ) [17].…”

Section: Introductionmentioning

confidence: 99%

Involvement of Nitric Oxide and Melatonin Enhances Cadmium Resistance of Tomato Seedlings through Regulation of the Ascorbate–Glutathione Cycle and ROS Metabolism

Wei

et al. 2023

IJMS

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Melatonin (MT) and nitric oxide (NO) act as signaling molecules that can enhance cadmium (Cd) stress resistance in plants. However, little information is available about the relationship between MT and NO during seedling growth under Cd stress. We hypothesize that NO may be involved in how MT responds to Cd stress during seedling growth. The aim of this study is to evaluate the relationship and mechanism of response. The results indicate that different concentrations of Cd inhibit the growth of tomato seedlings. Exogenous MT or NO promotes seedling growth under Cd stress, with a maximal biological response at 100 μM MT or NO. The promotive effects of MT-induced seedling growth under Cd stress are suppressed by NO scavenger 2-4-carboxyphenyl-4,4,5,5-tetramethyl-imidazoline-1-oxyl-3-oxide (cPTIO), suggesting that NO may be involved in MT-induced seedling growth under Cd stress. MT or NO decreases the content of hydrogen peroxide (H2O2), malonaldehyde (MDA), dehydroascorbic acid (DHA), and oxidized glutathione (GSSG); improves the content of ascorbic acid (AsA) and glutathione (GSH) and the ratios of AsA/DHA and GSH/GSSG; and enhances the activities of glutathione reductase (GR), monodehydroascorbic acid reductase (MDHAR), dehydroascorbic acid reductase (DHAR), ascorbic acid oxidase (AAO), and ascorbate peroxidase (APX) to alleviate oxidative damage. Moreover, the expression of genes associated with the ascorbate–glutathione (AsA-GSH) cycle and reactive oxygen species (ROS) are up-regulated by MT or NO under Cd conditions, including AAO, AAOH, APX1, APX6, DHAR1, DHAR2, MDHAR, and GR. However, NO scavenger cPTIO reverses the positive effects regulated by MT. The results indicate that MT-mediated NO enhances Cd tolerance by regulating AsA-GSH cycle and ROS metabolism.

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Section: Introductionmentioning

confidence: 99%

Involvement of Nitric Oxide and Melatonin Enhances Cadmium Resistance of Tomato Seedlings through Regulation of the Ascorbate–Glutathione Cycle and ROS Metabolism

Wei

et al. 2023

IJMS

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“…Various chemical compounds, whether natural or synthetic, can induce a primed state in plants, enhancing their ability to tolerate salt stress [ 9 ]. These compounds include ROS such as H 2 O 2 [ 15 ], H 2 S [ 16 ], melatonin [ 17 ], NO [ 18 ], silicon [ 13 ], and vitamins such as ascorbic acid [ 19 ], which are ideal priming agents for stimulating stress memory, so that seeds may overcome stresses during germination and prepare plants to better defend against external factors [ 20 ].…”

Section: Introductionmentioning

confidence: 99%

Seed Priming with Salicylic Acid Alleviates Salt Stress Toxicity in Barley by Suppressing ROS Accumulation and Improving Antioxidant Defense Systems, Compared to Halo- and Gibberellin Priming

Ellouzi,

Zorrig,

Amraoui

et al. 2023

Antioxidants

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Plants are highly sensitive to various environmental stresses, which can hinder their growth and reduce yields. In this study, we investigated the potential of seed priming with salicylic acid (SA), gibberellic acid (GA3), and sodium chloride (NaCl) to mitigate the adverse effects of salinity stress in Hordeum vulgare at the germination and early seedling stages. Exposing H. vulgare seeds to salt stress reduced the final germination percentage and seedling shoot and root growth. Interestingly, all seed treatments significantly improved salt-induced responses, with GA3 being more effective in terms of germination performance, plant growth, and photosynthesis. SA priming exhibited promising effects on antioxidant defense mechanisms, proline, sugar, and ascorbic acid production. Notably, SA priming also suppressed reactive oxygen species accumulation and prevented lipid peroxidation. These findings highlight the ability of SA to manage crosstalk within the seed, coordinating many regulatory processes to support plant adaptation to salinity stress.

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“…The former includes water, temperature, light, nitrate, oxygen, etc. The latter includes phytohormones, calcium ions, reactive oxygen species, and most importantly, storage compounds [4][5][6]. The major storage materials in seeds include oils, proteins, and carbohydrates.…”

Section: Introductionmentioning

confidence: 99%

Vacuolar Sugar Transporter TMT2 Plays Crucial Roles in Germination and Seedling Development in Arabidopsis

Cao,

Hu,

Hou

et al. 2023

IJMS

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Vacuolar sugar transporters transport sugar across the tonoplast, are major players in maintaining sugar homeostasis, and therefore play vital roles in plant growth, development, and biomass yield. In this study, we analyzed the physiological roles of the tonoplast monosaccharide transporter 2 (TMT2) in Arabidopsis. In contrast to the wild type (WT) that produced uniform seedlings, the tmt2 mutant produced three types of offspring: un-germinated seeds (UnG), seedlings that cannot form true leaves (tmt2-S), and seedlings that develop normally (tmt2-L). Sucrose, glucose, and fructose can substantially, but not completely, rescue the abnormal phenotypes of the tmt2 mutant. Abnormal cotyledon development, arrested true leaf development, and abnormal development of shoot apical meristem (SAM) were observed in tmt2-S seedlings. Cotyledons from the WT and tmt2-L seedlings restored the growth of tmt2-S seedlings through micrografting. Moreover, exogenous sugar sustained normal growth of tmt2-S seedlings with cotyledon removed. Finally, we found that the TMT2 deficiency resulted in growth defects, most likely via changing auxin signaling, target of rapamycin (TOR) pathways, and cellular nutrients. This study unveiled the essential functions of TMT2 for seed germination and initial seedling development, ensuring cotyledon function and mobilizing sugars from cotyledons to seedlings. It also expanded the current knowledge on sugar metabolism and signaling. These findings have fundamental implications for enhancing plant biomass production or seed yield in future agriculture.

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Neutral-to-positive cadmium effects on germination and seedling vigor, with and without seed priming

Cited by 14 publications

References 118 publications

Involvement of Nitric Oxide and Melatonin Enhances Cadmium Resistance of Tomato Seedlings through Regulation of the Ascorbate–Glutathione Cycle and ROS Metabolism

Involvement of Nitric Oxide and Melatonin Enhances Cadmium Resistance of Tomato Seedlings through Regulation of the Ascorbate–Glutathione Cycle and ROS Metabolism

Seed Priming with Salicylic Acid Alleviates Salt Stress Toxicity in Barley by Suppressing ROS Accumulation and Improving Antioxidant Defense Systems, Compared to Halo- and Gibberellin Priming

Vacuolar Sugar Transporter TMT2 Plays Crucial Roles in Germination and Seedling Development in Arabidopsis

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