Paclobutrazol Protects Wheat Seedlings from Heat and Paraquat Injury. Is Detoxification of Active Oxygen Involved?

Kraus, Trevor E.; Fletcher, R. A.

doi:10.1093/oxfordjournals.pcp.a078569

Cited by 50 publications

(12 citation statements)

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“…The reaction mixture contained 2.4 mL of 0.1 M potassium phosphate buffer (pH 7.4), 0.3 mL 2% H 2 O 2 , 100 μL of the enzyme extract, and 1 mL of 50 mM guaiacol. Catalase (CAT) activity was measured according to the consumption of H 2 O 2 at 240 nm (Trevor et al, 1994). One unit of CAT activity was defined as the amount of enzyme catalyzing the decomposition of 1 nmol of H 2 O 2 per min.…”

Section: Antioxidant Enzymes Activities Measurementmentioning

confidence: 99%

Effects of Warming and N Deposition on the Physiological Performances of Leymus secalinus in Alpine Meadow of Qinghai-Tibetan Plateau

Shen

Dong

et al. 2020

Front. Plant Sci.

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Warming and Nitrogen (N) deposition are key global changes that may affect ecophysiological process of territorial plants. In this paper, we examined the effects of warming, N deposition, and their combination effect on the physiological performances of Leymus secalinus. Four treatments were established in an alpine meadow of Qinghai-Tibetan plateau: control (CK), warming (W), N deposition (N), and warming plus N deposition (NW). Warming significantly decreased the photosynthetic rate (A net), stomatal conductance (g s), intercellular CO 2 concentration (C i), and transpiration rate (T r), while N deposition and warming plus N deposition significantly increased those parameters of L. secalinus. Warming significantly increased the VPD and L s , while N deposition and warming plus N deposition had a significant positive effect. Warming negatively reduced the leaf N content, Chla, Chlb, and total Chl content, while N deposition significantly promoted these traits. Warming, N deposition, and their combination significantly increased the activity of SOD, POD, and CAT. Besides, warming and warming plus N deposition significantly increased the MDA content, while N deposition significantly decreased the MDA content. N deposition and warming plus N deposition significantly increased the Rubisco activity, while warming showed no significant effect on Rubisco activity. N deposition and warming plus N deposition significantly increased the Fv/Fm, FPSII, qP, and decreased NPQ, while warming significantly decreased the Fv/Fm, FPSII, qP, and increased NPQ. N deposition strengthened the relations between g s , Chl, Chla, Chlb, Rubisco activity, and A net. Under warming, only g s showed a significantly positive relation with A net. Our findings suggested that warming could impair the photosynthetic potential of L. secalinus

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Section: Antioxidant Enzymes Activities Measurementmentioning

confidence: 99%

Effects of Warming and N Deposition on the Physiological Performances of Leymus secalinus in Alpine Meadow of Qinghai-Tibetan Plateau

Shen

Dong

et al. 2020

Front. Plant Sci.

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“…However, in the case of R. sativus (Figure 4d), the increasing concentration of the tested compounds in soil caused a constant increase in the amount of carotenoids in green parts of the plant [45]. Carotenoids are necessary to protect chlorophyll against exposed biotic and abiotic factors, but the dependence of carotenoid level on the stress conditions is ambiguous [46,47,48,49]. One of the most important environmental factors affecting the level and metabolism of carotenoids is oxidative stress, which occurs when the absorbed energy exceeds the capacity of the photosynthetic plant device.…”

Section: Resultsmentioning

confidence: 99%

The Effect of New Thiophene-Derived Diphenyl Aminophosphonates on Growth of Terrestrial Plants

et al. 2019

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The aim of this work was to evaluate the impact of the thiophene-derived aminophosphonates 1–6 on seedling emergence and growth of monocotyledonous oat (Avena sativa) and dicotyledonous radish (Raphanus sativus L.), and phytotoxicity against three persistent and resistant weeds (Galinsoga parviflora Cav., Rumex acetosa L., and Chenopodium album). Aminophosphonates 1–6 have never been described in the literature. The phytotoxicity of tested aminophosphonates toward their potential application as soil-applied herbicides was evaluated according to the OECD (Organization for Economic and Cooperation Development Publishing) 208 Guideline. In addition, their ecotoxicological impact on crustaceans Heterocypris incongruens and bacteria Aliivibrio fischeri was measured using the OSTRACODTOXKITTM and Microtox® tests. Obtained results showed that none of the tested compounds were found sufficiently phytotoxic and none of them have any herbicidal potential. None of the tested compounds showed important toxicity against Aliivibrio fischeri but they should be considered as slightly harmful. Harmful impacts of compounds 1–6 on Heterocypris incongruens were found to be significant.

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“…The PPO activity was determined using 0.05 M catechol as substrate, as described by Zauberman et al (1991). The POD activity was measured using the guaiacol method as described by Kraus and Fletcher (1994). All these measurements were biologically repeated for six times.…”

Section: Methodsmentioning

confidence: 99%

Deficiency in Silicon Transporter Lsi1 Compromises Inducibility of Anti-herbivore Defense in Rice Plants

Lin

Sun

et al. 2019

Front. Plant Sci.

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Silicon (Si) application can significantly enhance rice resistance against herbivorous insects. However, the underlying mechanism is elusive. In this study, silicon transporter mutant OsLsi1 and corresponding wild-type rice (WT) were treated with and without Si to determine Si effects on rice resistance to leaffolder (LF), Cnaphalocrocis medinalis (Guenée) (Lepidoptera: Pyralidae). Si application on WT plants significantly promoted rice plant growth, upregulated expression level of OsLsi1 and increased Si accumulation in the leaves and roots, as well as effectively reduced LF weight gain, while it showed only marginal or no effect on the mutant plants. Furthermore, upon LF infestation, transcript levels of OsLOX , OsAOS2 , OsCOI1a , OsCOI1b , and OsBBPI , and activity of catalase, superoxide dismutase, peroxidase, and polyphenol oxidase were significantly higher in Si-treated than untreated WT plants. However, OsLsi1 mutant plants displayed higher susceptibility to LF, and minimal response of defense-related enzymes and jasmonate dependent genes to Si application. These results suggest that induced defense plays a vital role in Si-enhanced resistance and deficiency in silicon transporter Lsi1 compromises inducibility of anti-herbivore defense in rice plants.

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Paclobutrazol Protects Wheat Seedlings from Heat and Paraquat Injury. Is Detoxification of Active Oxygen Involved?

Cited by 50 publications

References 0 publications

Effects of Warming and N Deposition on the Physiological Performances of Leymus secalinus in Alpine Meadow of Qinghai-Tibetan Plateau

Effects of Warming and N Deposition on the Physiological Performances of Leymus secalinus in Alpine Meadow of Qinghai-Tibetan Plateau

The Effect of New Thiophene-Derived Diphenyl Aminophosphonates on Growth of Terrestrial Plants

Deficiency in Silicon Transporter Lsi1 Compromises Inducibility of Anti-herbivore Defense in Rice Plants

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