Exchange of oxygen and its role in energy dissipation during drought stress in tomato plants

Haupt‐Herting, Silke; Fock, Heinrich P.

doi:10.1111/j.1399-3054.2000.1100410.x

Cited by 60 publications

(32 citation statements)

References 33 publications

(66 reference statements)

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“…Due to the low irradiances during our experiment in winter, q N increased rather moderate under severe stress, but thermal dissipation of absorbed photon energy is well established in studies with higher irradiances (Flexas and Medrano 2002). Haupt-Herting and Fock (2000) demonstrated in tomato that under 90 µmol m −2 s −1 , q N increased but to a lower extent compared to the same stress at 400 µmol m −2 s −1 . The effects on q N and q P for both irradiances were also moderate in tomato for Ψ w of −1.2 MPa, but were very pronounced for Ψ w of −2.0 MPa.…”

mentioning

confidence: 75%

Chlorophyll fluorescence as a tool for evaluation of drought stress in strawberry

Razavi

Pollet²,

Steppe³

et al. 2008

Photosynt.

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The effect of water deficit on chlorophyll fluorescence, sugar content, and growth parameters of strawberry (Fragaria×ananassa Duch. cv. Elsanta) was studied. Drought stress caused significant reductions in leaf water potential, fresh and dry masses, leaf area, and leaf number. A gradual reduction of photochemical quenching (q P ) and quantum efficiency (Φ PS2 ) was observed under drought stress while non-photochemical quenching (q N ) increased. Maximum efficiency of photosystem 2 (F v /F m ) was not affected by drought stress.Additional key words: Fragaria×ananassa; maximum efficiency of photosystem 2; photochemical and non-photochemical quenching; photosynthesis; water deficit.--Water deficiency is a limiting factor for plant growth and development as well as for a wide range of physiological processes such as photosynthesis. Chlorophyll (Chl) fluorescence provides useful information about leaf photosynthetic performance of many plants under drought stress (Baker and Rosenqvist 2004). However, studies on strawberry under drought stress are still limited and focus mainly to research on irrigation scheduling (Kruger et al. 1999). In order to better understand the response of strawberry to the onset and progress of drought stress we studied Chl fluorescence parameters in parallel with plant growth performance.A greenhouse experiment was conducted from October 2006 till February 2007 with the short day cultivar Fragaria×ananassa Duch. cv. Elsanta. Plants were grown in 3 000 cm³ pots in 80 : 20 % peat and perlite mixture at 18/14 °C day/night temperature, a daily average vapour pressure deficit (VPD) of 0.5−0.9 kPa, and a 16-h photoperiod. Natural day length was extended with metal halide lamps giving 30−40 µmol(PAR) m −2 s −1 at canopy level and daily average value of PAR ranged from 20 till 150 µmol m −2 s −1 . Plants were weekly supplied with 100 cm 3 of a standard nutrient solution for strawberry (Lieten 1995) and with rain water on the other days maintaining the pots close to field capacity. After nine weeks pots were assigned to a control and a drought stress (irrigation stop) treatment in a completely randomized block design with three replicates and 25 plants for each experimental plot. Volumetric substrate moisture content θ v (Theta probe, ML2X, Delta T Devices, Cambridge, UK) was recorded at hourly intervals. During the experiment, measurements were performed at days 1, 16, 27, 40, 44, and 51. The leaf water potential (Ψ w ) of the upper leaflet of the youngest fully developed leaf (n = 6 per experimental plot) was measured with a thermocouple psychrometer operating in the psychrometric mode between 08:00 and 09:00. Chl fluorescence was measured on the youngest fully expanded triplet leaf (n = 4 per experimental plot) using a portable fluorometer (PAM-2000, Walz, Effeltrich, Germany). Leaves were allowed to dark adapt for 20 min (Genty et al. 1998). Sugars of fully expanded leaves (n = 6 per experimental plot) were extracted with 80 % ethanol and analyzed by HPLC with pulsed amperometric detection (Dione...

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confidence: 75%

Chlorophyll fluorescence as a tool for evaluation of drought stress in strawberry

Razavi

Pollet²,

Steppe³

et al. 2008

Photosynt.

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“…This great controversy about the photoprotective function of photorespiration exists for many years (Osmond and Björkman 1972). On the one hand, photorespiration can protect the photosynthetic apparatus against photodamage (Osmond and Björkman 1972, Katona et al 1992, Park et al 1996, Osmond et al 1997, and the photoprotective function of photorespiration could be particularly important under high PPFD in DS-leaves (Osmond and Grace 1995, Kozaki and Takeka 1996, Wingler et al 1999, Haupt-Herting and Fock 2000, Guan et al 2004, Streb et al 2005. On the other hand, some researchers (Brestic et al 1995, Meng et al 1999, Nogués and Alegre 2002 suggest that photorespiration does not play significant role in protection of photosynthetic apparatus against photodamage.…”

Section: Introductionmentioning

confidence: 94%

Photoprotective function of photorespiration in Reaumuria soongorica during different levels of drought stress in natural high irradiance

Bai¹,

Xu²,

Kang³

et al. 2008

Photosynt.

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Diurnal patterns of gas exchange and chlorophyll (Chl) fluorescence parameters of photosystem 2 (PS2) as well as H 2 O 2 content were analyzed in Reaumuria soongorica (Pall.) Maxim., a perennial semi-shrub. The rate of photorespiration was estimated by combined measurement of gas exchange and Chl fluorescence. The rate of photorespiration increased with the increasing drought stress (DS). The ratio of carboxylation electron flow to oxygenation electron flow (J c /J o ) and the maximal photochemical efficiency of PS2 (variable to maximum fluorescence ratio, F v /F m ) decreased with the increasing DS. F v /F m in isonicotinic acid hydrazide (INH)-sprayed plants was lower than that in normal plants under moderate DS, but no significant difference was observed under severe DS. H 2 O 2 content in INH-sprayed plants was significantly lower than that in normal plants under severe DS. Taken together, photorespiration in R. soongorica consumed excess electrons and protected photosynthetic apparatus under moderate DS, whereas it accelerated H 2 O 2 accumulation markedly and induced the leaf abscission under severe DS.

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“…A possible indicator of the incorporation of inorganic P in organic compounds is the level of the nucleotides NADP and NADPH, although normally the status of these levels has been related to the appearance of some type of stress that reduces their concentration by altering photosynthetic processes (Haupt-Herting and Fock 2000). The lowering of the NADP + NADPH concentration with high foliar-application rates of Phi (0.5 and 1 mM) suggests that these treatments are not effective from the standpoint of P incorporation in these compounds (Table 4).…”

Section: Bioindicators Of Pmentioning

confidence: 99%

Physiological and Nutritional Evaluation of the Application of Phosphite as a Phosphorus Source in Cucumber Plants

Constán-Aguilar

Sánchez-Rodríguez

Rubio-Wilhelmi

et al. 2013

Communications in Soil Science and Plant Analysis

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The aim of this study was to determine how different phosphite and phosphate rates applied together affect the growth and morphology parameters in cucumber plants as well as to characterize the nutritional and physiological state of phosphorus (P). Different foliar application rates of phosphite were applied to analyze subsequent biomass production, the relative growth rate, morphological parameters, P bioindicators, P forms, and P-use efficiency. The data suggest that the application of phosphite as a P fertilizer at a rate of ≥0.5 mM would be an appropriate and effective strategy under suboptimal conditions of phosphate in the growth medium, represented by 0.5 mM in our work, as it improved the growth parameters, number of flowers, leaf area, nutritional state of P, incorporation of P in structural organs, and P-use efficiency by the plant. The results indicate that the validity of the foliar use of phosphite as a P fertilizer in cucumber plants was subject to phosphate availability in the culture medium.

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Exchange of oxygen and its role in energy dissipation during drought stress in tomato plants

Cited by 60 publications

References 33 publications

Chlorophyll fluorescence as a tool for evaluation of drought stress in strawberry

Chlorophyll fluorescence as a tool for evaluation of drought stress in strawberry

Photoprotective function of photorespiration in Reaumuria soongorica during different levels of drought stress in natural high irradiance

Physiological and Nutritional Evaluation of the Application of Phosphite as a Phosphorus Source in Cucumber Plants

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