Influence of Paclobutrazol and Application Methods on High-temperature Stress Injury in Cucumber Seedlings

Baninasab, Bahram; Ghobadi, Cyrus

doi:10.1007/s00344-010-9188-2

Cited by 45 publications

(32 citation statements)

References 30 publications

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“…1C) in line with previous published reports26. Reduced size in Pbz-treated plants may be linked with its inhibitory action on the GAs, which are involved in cell division.…”

Section: Resultssupporting

confidence: 91%

Paclobutrazol induces tolerance in tomato to deficit irrigation through diversified effects on plant morphology, physiology and metabolism

Pal

Zhao

Khan

et al. 2016

Sci Rep

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Dwindling water resources combined with meeting the demands for food security require maximizing water use efficiency (WUE) both in rainfed and irrigated agriculture. In this regard, deficit irrigation (DI), defined as the administration of water below full crop-water requirements (evapotranspiration), is a valuable practice to contain irrigation water use. In this study, the mechanism of paclobutrazol (Pbz)-mediated improvement in tolerance to water deficit in tomato was thoroughly investigated. Tomato plants were subjected to normal irrigated and deficit irrigated conditions plus Pbz application (0.8 and 1.6 ppm). A comprehensive morpho-physiological, metabolomics and molecular analysis was undertaken. Findings revealed that Pbz application reduced plant height, improved stem diameter and leaf number, altered root architecture, enhanced photosynthetic rates and WUE of tomato plants under deficit irrigation. Pbz differentially induced expression of genes and accumulation of metabolites of the tricarboxylic acid (TCA) cycle, γ-aminobutyric acid (GABA-shunt pathway), glutathione ascorbate (GSH-ASC)-cycle, cell wall and sugar metabolism, abscisic acid (ABA), spermidine (Spd) content and expression of an aquaporin (AP) protein under deficit irrigation. Our results suggest that Pbz application could significantly improve tolerance in tomato plants under limited water availability through selective changes in morpho-physiology and induction of stress-related molecular processes.

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“…1C) in line with previous published reports26. Reduced size in Pbz-treated plants may be linked with its inhibitory action on the GAs, which are involved in cell division.…”

Section: Resultssupporting

confidence: 91%

Paclobutrazol induces tolerance in tomato to deficit irrigation through diversified effects on plant morphology, physiology and metabolism

Pal

Zhao

Khan

et al. 2016

Sci Rep

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“…Heat stress inhibits cucumber growth (Baninasab and Ghobadi 2011). The same result was obtained in this study.…”

Section: Discussionsupporting

confidence: 88%

Glucose application protects chloroplast ultrastructure in heat-stressed cucumber leaves through modifying antioxidant enzyme activity

Huang¹,

Zhou²,

Yang³

et al. 2015

Biologia plant.

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To elucidate a physiological mechanism of heat stress mitigation by exogenous glucose, seedlings of Cucumis sativus cv. Jinchun No. 4 were pretreated with glucose and then exposed to normal (25/18 °C) and elevated (42/38 °C) temperatures. We investigated whether glucose can protect cucumber plantlets and chloroplast ultrastructure from heat and whether this protection is associated with antioxidant enzymes, proline, and soluble sugars. Heat inhibited plant growth, disorganized membranes of 86.33 % of chloroplasts, and elevated the content of malondialdehyde (MDA), superoxide radical (O 2 .-), and hydrogen peroxide (H 2 O 2 ). An optimum concentration of glucose was 30 mM as it significantly alleviated plant growth inhibition and obviously reduced the content of MDA, O 2 .-, and H 2 O 2 under the heat stress. The pretreatment with 30 mM glucose mitigated heat-induced damage of chloroplast ultrastructure and changes in leaf morphology more than 30 mM mannitol suggesting that glucose did not act only as osmolyte. Moreover, the glucose pretreatment increased activities of some antioxidant enzymes and enhanced the content of proline and soluble sugars under the heat stress, as well as the transcriptions of Cu/Zn-superoxide dismutase, Mn-superoxide dismutase, catalase, and glutathione reductase genes. We conclude that the pretreatment with 30 mM glucose protected chloroplast ultrastructure and enhanced heat tolerance of the seedlings by the increased activites of antioxidants and the content of proline and soluble sugars, and the repressed accumulation of reactive oxygen species.

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“…Reduction in RWC of leaves was observed in plants exposed to water deficit conditions. There are reports that PBZ treated plants of Curcuma alismatifolia Gagnep (Jungklang and Saengnil, 2012) and cucumber seedling (Baninasab and and Ghobadi, 2011) had higher value of RWC. Paclobutrazol has been reported to enhance water retention and thus increased survival in wheat (Aly and Lathif, 2011) and barley (Rady and Gaballah, 2012) by accelerating stomatal response and reducing transpiration rate under water deficit condition.…”

Section: Resultsmentioning

confidence: 99%

“…PBZ application has been reported to increase level of pigments in cucumber (Baninasab and Ghobadi, 2011) and wheat (Nouriyani et al, 2012). The decrease in chlorophyll Foliar application Drenching application PBZ (mg l -1 ) PBZ (mg l -1 ) y = 1E-05x 2 + 0.004x + 1.294, R 2 = 0.775 Soumya and Kumar, 2017 under water deficit stress is mainly the result of damage to chloroplasts caused by active oxygen species (Smirnoff, 1995).…”

Section: Resultsmentioning

confidence: 99%

Optimization of Paclobutrazol Dose for Foliar and Drenching Applications under Water Deficit Stress in Chickpea (Cicer arietinum L.)

Soumya¹,

Kumar²

2017

IJBSM

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Chickpea (Cicer arietinum L.) is the fourth most important pulse crop rich in protein by virtue of N 2 fixation. Water deficit is a major limitation in chickpea production. Paclobutrazol (PBZ), a potential triazole, has been reported to provide plant protection against abiotic stresses. Therefore, an experiment was conducted using kabuli chickpea variety Pusa 1108 (sensitive to water deficit) to identify its optimum dose for foliar and drenching application. Water deficit stress was imposed by withholding the water at vegetative stage. Just prior to water stress treatment, plants were treated exogenously with varying dose paclobutrazol for foliar (0, 30, 60, 90, 120 and 150 mg l -1 ) and drenching (0, 60, 120, 180, 240 and 300 mg l -1 ) applications. Maximum enhancement of relative water content (RWC), membrane stability index (MSI), photosynthetic rate (P N ), chlorophyll a (chl a ), chlorophyll b (chl b ) and total chlorophyll during water deficit stress and after recovery were obtained with the foliar application of PBZ @ 60 mg l -1 while for PBZ drenching @ 120 mg l -1 . On an average, in general based on curve fitting of under taken physiological responses of chickpea to PBZ, optimum dose of PBZ foliar application was estimated 67.5 mg l -1 while for PBZ drenching 127 mg l -1 . Materials and MethodsChickpea, optimum dose, paclobutrazol, photosynthesis, water deficit stress Abstract Article History

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Influence of Paclobutrazol and Application Methods on High-temperature Stress Injury in Cucumber Seedlings

Cited by 45 publications

References 30 publications

Paclobutrazol induces tolerance in tomato to deficit irrigation through diversified effects on plant morphology, physiology and metabolism

Paclobutrazol induces tolerance in tomato to deficit irrigation through diversified effects on plant morphology, physiology and metabolism

Glucose application protects chloroplast ultrastructure in heat-stressed cucumber leaves through modifying antioxidant enzyme activity

Optimization of Paclobutrazol Dose for Foliar and Drenching Applications under Water Deficit Stress in Chickpea (Cicer arietinum L.)

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