Influence of temperature increase on evaportranspiration rate and cytokinin content in wheat seedlings

Фархутдинов, Р.Г.; Veselov, S. Yu.; Kudoyarova, G. R.; Valcke, Roland

doi:10.1023/a:1000627916005

Cited by 14 publications

(5 citation statements)

References 4 publications

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“…One potential explanation for cytokinin reduction in shoots is the result of inhibition of cytokinin transport from roots to shoots under elevated temperatures, because cytokinins are primarily produced in roots. This perspective is supported by a study imposed in wheat, which reported that the content of cytokinins decreased in shoots and accumulated in roots simultaneously as a result of temperature increase (Farkhutdinov et al, 1997). Additionally, the decline of endogenous cytokinins in senescing tissues may be the result of a decrease in biosynthesis or an increase in catabolism (Nooden and Leopoid, 1988).…”

Section: Discussionmentioning

confidence: 82%

Heat-induced Leaf Senescence and Hormonal Changes for Thermal Bentgrass and Turf-type Bentgrass Species Differing in Heat Tolerance

Xu¹,

Huang²

2007

J. Amer. Soc. Hort. Sci.

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Leaf senescence can be induced by many environmental stresses, including supraoptimal temperatures. The objectives of this study were to evaluate leaf senescence induced by heat stress for two Agrostis species contrasting in heat tolerance and to examine whether heat-induced leaf senescence in both species was associated with changes in three major senescence-related hormones: ethylene, abscisic acid (ABA), and cytokinins. Plants of heat-tolerant rough bentgrass (Agrostis scabra Willd.) and heat-sensitive creeping bentgrass (Agrostis stolonifera L.) were exposed to 35/30 °C (day/night) (high temperature) or 20/15 °C (control) for 35 d in growth chambers. Turf quality, photochemical efficiency (Fv/Fm), and the contents of two pigments (chlorophyll and carotenoid) for both species decreased under high temperature; however, heat-tolerant A. scabra exhibited delayed and less severe decline in all parameters compared with heat-sensitive A. stolonifera. Ethylene production rate increased in both species at 35 °C, but the increase was observed 21 days later in A. scabra compared with that in A. stolonifera. ABA content increased at the initiation of heat stress and then declined in both species after prolonged heat stress. However, the timing of the increase was delayed for 7 days and the highest level of ABA content was less in A. scabra (4.0 times that of the control) than that in A. stolonifera (5.9 times that of the control). Decreases in both forms of cytokinins (transzeatin/zeatin riboside and isopentenyl adenosine) were also delayed for 14 days and less pronounced in A. scabra. Correlation analysis revealed that leaf senescence induced by heat stress was negatively correlated to ethylene and ABA accumulation and positively correlated to cytokinin production. Delayed leaf senescence in A. scabra under heat stress could be related to slower and less magnitude of changes in ethylene, ABA, and cytokinins.

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Section: Discussionmentioning

confidence: 82%

Heat-induced Leaf Senescence and Hormonal Changes for Thermal Bentgrass and Turf-type Bentgrass Species Differing in Heat Tolerance

Xu¹,

Huang²

2007

J. Amer. Soc. Hort. Sci.

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“…This could be due to its higher supply by the roots to the shoots and leaves. Farkhutdinov et al (1997) have reported decreased cytokinin accumulation in wheat seedlings under heat stress.…”

Section: Discussionmentioning

confidence: 98%

“…Cytokinins have been used as plant tolerance indicators to abiotic stresses ( Székács et al, 2000 ). Furthermore, wheat ( Farkhutdinov et al, 1997 ), tomato and tobacco lines ( Székács et al, 2000 ), as well as pea ( Atanassova et al, 1996 ) plants, with higher cytokinin contents exhibited more tolerance to several stress factors.…”

Section: Discussionmentioning

confidence: 99%

Antioxidative Defense System, Hormones, and Metabolite Accumulation in Different Plant Parts of Two Contrasting Rice Cultivars as Influenced by Plant Growth Regulators Under Heat Stress

2022

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We examined the metabolic, hormonal, enzymatic, and non-enzymatic responses of various plant components (leaf, root, and xylem sap) to plant growth regulators [methyl jasmonate (MeJA), ascorbic acid (Vc), brassinosteroids (Br), triazoles (Tr), alpha-tocopherol (Ve), and control] under heat stress [ambient temperature (AT), heat stress at night time (HNT), and heat stress at day (HDT)] in heat-sensitive (IR-64) and heat-tolerant (Huanghuazhan) rice cultivars under greenhouse conditions. Our results showed that heat stress altered the antioxidant activities and hormonal balance and rigorously reduced total soluble sugars, proteins, and proline, whereas increases were observed in H2O2 and Malondialdehyde (MDA) content accumulation in the plant xylem sap and leaves of both tested cultivars; however, the impact was more pronounced in IR-64. The superoxide dismutase (SOD), peroxidase (POD), catalase (CAT), ascorbate peroxidase (APX), glutathione reductase (GR), Glutathione (GSH), dehydroascorbate reductase (DHAR), and monodehydroascorbate reductase (MDHAR) activities were higher in Huanghuazhan than in IR-64 in response to temperature stress, when compared to AT. Additionally, heat stress increased abscisic acid (ABA) levels in both rice cultivars, especially in IR-64. The highest concentrations of hormones were recorded in the roots, followed by the leaves and xylem sap, in both cultivars. HDT and HNT stresses severely reduced the concentrations of all of the cytokinin types (except for iP9G and tZ9G) and IAA in the different plant parts of rice cultivars. Moreover, HNT was more detrimental for hormone and metabolite synthesis in both cultivars. The growth regulators (especially Vc + Br + Ve + MeJA) were comparatively more effective in minimizing the hostile impact of heat stress on most of the studied traits and should be applied to obtain the optimum yield of rice in subtropical and tropical areas under changing climatic conditions.

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“…The levels of cytokinins were consistent with findings in previous studies (Liu et al, 2002; Wang et al, 2003; Wang et al, 2004). The reduction in leaf cytokinin content may result from the inhibition of cytokinin transport from roots to shoots under elevated temperatures, as cytokinins are synthesized primarily in root tips and transported via the xylem to the shoots to exert major regulatory influences on growth and development (Farkhutdinov et al, 1997; Haberer and Kieber, 2002). Foliar application of 25 μM ZR solution elevated cytokinin levels in creeping bentgrass leaves under heat stress.…”

Section: Discussionmentioning

confidence: 99%

“…The production of ethylene influences many aspects of plant growth and development, including the stimulation of leaf senescence, the ripening of fruit, the opening of flowers, and the abscission of leaves (Grbic and Bleecker, 1995). In contrast, the production of cytokinins in leaves decreases under various stress conditions, such as heat stress (Farkhutdinov et al, 1997; Wang et al, 2004). Cytokinins are considered senescence inhibitors, which are mainly involved in cell division, cell growth, and differentiation (Werner et al, 2001).…”

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confidence: 99%

Effects of Foliar‐Applied Ethylene Inhibitor and Synthetic Cytokinin on Creeping Bentgrass to Enhance Heat Tolerance

Huang

2009

Crop Science

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Heat stress is a major factor causing leaf senescence and other physiological damages in cool‐season grass species. Cytokinins and ethylene are two major plant hormones affecting leaf senescence. The objective of this study was to determine whether foliar application of an ethylene synthesis inhibitor (aminoethoxyvinylglycine, AVG) and a synthetic cytokinin (trans‐zeatin riboside, t‐ZR) would enhance creeping bentgrass (Agrostis stolonifera L.) tolerance to heat stress associated with the suppression of leaf senescence. Creeping bentgrass ‘Penncross’ was exposed to either heat stress (35°C) or optimal growth temperature (20°C) for 35 d in growth chambers. Plants at each temperature were treated with 25 μM AVG, 25 μM t‐ZR or water (control). Foliar spray of AVG or zeatin riboside (ZR) solution resulted in increases in turf quality, leaf chlorophyll content, activities of antioxidant enzymes, and the reduction in lipid peroxidation, compared with water‐treated plants, for plants exposed to heat stress. In addition, foliar application of AVG suppressed ethylene evolution, whereas exogenous ZR resulted in elevated endogenous cytokinin levels under heat stress. The results suggest that the application of AVG or ZR suppressed leaf senescence and improved heat tolerance of creeping bentgrass, which could be because of their effects on endogenous production of ethylene and cytokinins and on antioxidant metabolism.

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Influence of temperature increase on evaportranspiration rate and cytokinin content in wheat seedlings

Cited by 14 publications

References 4 publications

Heat-induced Leaf Senescence and Hormonal Changes for Thermal Bentgrass and Turf-type Bentgrass Species Differing in Heat Tolerance

Heat-induced Leaf Senescence and Hormonal Changes for Thermal Bentgrass and Turf-type Bentgrass Species Differing in Heat Tolerance

Antioxidative Defense System, Hormones, and Metabolite Accumulation in Different Plant Parts of Two Contrasting Rice Cultivars as Influenced by Plant Growth Regulators Under Heat Stress

Effects of Foliar‐Applied Ethylene Inhibitor and Synthetic Cytokinin on Creeping Bentgrass to Enhance Heat Tolerance

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