Chlorophyll fluorescence and water relations of salt-stressed plants

Downton, W. J. S.; Millhouse, Jeny

doi:10.1016/0304-4211(85)90005-7

Cited by 14 publications

(7 citation statements)

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“…Salinity reduced leaf chlorophyll content in grapevine, bean, barley, citrus and mangrove (Downton and Millhouse, 1985), spinach , and Acacia saligna (Shaybany and Kashirad, 1978).…”

Section: Plant Responses To Salinitymentioning

confidence: 99%

Effects of sodium chloride and polyethylene glycol on the water relations, growth, and morphology of citrus rootstock seedlings / by Mongi Zerki.

Zekri¹

1987

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“…Salinity reduced leaf chlorophyll content in grapevine, bean, barley, citrus and mangrove (Downton and Millhouse, 1985), spinach , and Acacia saligna (Shaybany and Kashirad, 1978).…”

Section: Plant Responses To Salinitymentioning

confidence: 99%

Effects of sodium chloride and polyethylene glycol on the water relations, growth, and morphology of citrus rootstock seedlings / by Mongi Zerki.

Zekri¹

1987

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“…It is well known that various partial processes of photosynthesis are affected differently by changes in leaf or chloroplast temperature or water potential (3,5,17,25). Also, there is increasing understanding that the effects of stress on photosynthetic rates can be only partially attributed to stomatal function (11).…”

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confidence: 99%

Variable Chlorophyll a Fluorescence and CO₂ Uptake in Water-Stressed White Spruce Seedlings

Toivonen

Vidaver²

1988

Plant Physiol.

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Regulation of photosynthetic activity can contribute to the prevention of photodamage in stress resistant plants during exposure to drought or low temperatures. Responses to increasing levels of water stress were examined in seedlings of the stress resistant forest conifer, white spruce (Picea glauca [Moench.] Voss). Some seedlings were grown under aseptic in vitro conditions and others in pots. In relatively resistant in vivo seedlings, photosynthetic activities changed slowly in response to increasing water stress. Highly sensitive in vitro seedlings responded to water deficits similarly to in vivo seedlings but over a much shorter time scale. Fluorescence, CO2 exchange, and stomatal conductance data reported here suggest possible mechanisms for the regulation of photochemical activity in these plants.The regulation of photosynthetic activity may be a necessary adaptation enabling stress resistant plants to avoid photodamage during exposure to drought, low temperatures, or other stresses. It is well known that various partial processes of photosynthesis are affected differently by changes in leaf or chloroplast temperature or water potential (3,5,17,25). Also, there is increasing understanding that the effects of stress on photosynthetic rates can be only partially attributed to stomatal function (11). Photochemical water splitting appears to be blocked in various forest conifers at subfreezing temperatures or by water stress (9,14) and has been reported to be reversibly inhibited in a high intertidal marine alga undergoing desiccation (26,34). Inactivation of water splitting can prevent the formation of active oxygen species (7) and therefore protect the plants from photodamage.At any given instant the amplitude of Fv2 is dependent on the redox state of the QA (19). The rates of electron transfer from the OEC to QA and reoxidation by the intersystem transport chain determine its redox state. The P-level rise (Fig. 1) is a result of more rapid QA reduction than reoxidation by intersystem electron carriers (1). Water-splitting by OEC determines the QA reduction rate while reoxidation is a complex function which includes the activity of PSI, the photochemical generation of ATP (photophosphorylation) and NADPH+, the dark reactions of CO2 assimilation and various regulatory or energy dissipating mechanisms (15,16,28,32,33 into balance of the various processes which determine the electron flow rate (see Refs. 2, 10, 13, and 23 for reviews on the component systems). The redox state of QA and, therefore, the amplitude of Fv are thus dependent on the interaction of processes with quite different stress sensitivities.Utilizing parallel fluorescenee and gas exchange measurements, effects of water stress on white spruce seedlings were investigated. MATERIALS AND METHODSResponses to Soil Moisture Stress. Forty, 1 year old, white spruce seedlings were subjected to varying degrees of water stress by withholding water for various periods of time, up to 10 d. The seedlings were then inserted into a previously describ...

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“…10). Toxic ions, such as chloride, have been found to accumulate in the leaves under saline conditions and to reduce photosynthesis (Downton & Millhouse, 1985). Whether this leads to the low rates of photosynthesis associated with low stomata!…”

Section: Stomata! Resistancementioning

confidence: 99%

“…Salinity, therefore, affects plant growth by diminishing the availability of soil water for the plant and increasing the presence of toxic ions (Bernstein, 1975;Gale, 1975;Greenway & Munns, 1980). Photosynthesis in the grapevine is affected by a number of climatic factors (Smart, 1974;Kriedemann, 1977;Sepulveda & Kliewer, 1986) and cultivation practices (Hofacker, 1978;Hunter & Visser, 1988;Archer & Strauss, 1990) and is reduced by salinity (Downton, 1977;Walker et al, 1981;Downton & Millhouse, 1985). In the grapevine, however, variation in salt tolerance is well known with respect to both the rootstock (Sauer, 1968;Downton, 1985;Arbabzadeh & Dutt, 1987) and scion cultivar (Alexander & Woodham, 1968;Groot Obbink & Alexander, 1973;Barlass & Skene, 1981;West & Taylor, 1984).…”

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Physiological Response of Vi tis vinif era L. ( cv. Chenin blanc) Grafted onto Different Rootstocks on a Relatively Saline Soil

Southey

Jooste

2017

SAJEV

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Certain physiological parameters, namely leaf water potential, stomatal resistance and rate of photosynthesis of Chenin blanc grafted onto 10 rootstock cultivars on a relatively saline soil under irrigation in a hot region (V), were measured for two growing seasons. Soil electrical resistance, which varied from 632 to 271 ohms in the shallower soil layers (<500 mm) and from 414 to 167 ohms deeper in the soil, decreased during the growing seasons. Although diurnal and seasonal patterns of change of the physiological parameters measured did not differ between rootstock cultivars, significant differences in their magnitudes were apparent. The rootstocks US 16-13-23, 13-5 E.V.E. Jerex were more stressed than 101-14 Mgt, 143-B Mgt and 110 Richter and had lower rates of photosynthesis. Photosynthetic rate was predominantly inversely correlated with stomatal closure. The use of 101-14 Mgt and 143-B Mgt is recommended under relatively saline conditions.

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Chlorophyll fluorescence and water relations of salt-stressed plants

Cited by 14 publications

References 14 publications

Effects of sodium chloride and polyethylene glycol on the water relations, growth, and morphology of citrus rootstock seedlings / by Mongi Zerki.

Effects of sodium chloride and polyethylene glycol on the water relations, growth, and morphology of citrus rootstock seedlings / by Mongi Zerki.

Variable Chlorophyll a Fluorescence and CO₂ Uptake in Water-Stressed White Spruce Seedlings

Physiological Response of Vi tis vinif era L. ( cv. Chenin blanc) Grafted onto Different Rootstocks on a Relatively Saline Soil

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Chlorophyll fluorescence and water relations of salt-stressed plants

Cited by 14 publications

References 14 publications

Effects of sodium chloride and polyethylene glycol on the water relations, growth, and morphology of citrus rootstock seedlings / by Mongi Zerki.

Effects of sodium chloride and polyethylene glycol on the water relations, growth, and morphology of citrus rootstock seedlings / by Mongi Zerki.

Variable Chlorophyll a Fluorescence and CO2 Uptake in Water-Stressed White Spruce Seedlings

Physiological Response of Vi tis vinif era L. ( cv. Chenin blanc) Grafted onto Different Rootstocks on a Relatively Saline Soil

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Variable Chlorophyll a Fluorescence and CO₂ Uptake in Water-Stressed White Spruce Seedlings