The quantum yield of photosynthetic electron transport evaluated by chlorophyll fluorescence as an indicator of drought tolerance in durum wheat

Flagella, Zina; Pastore, Donato; Campanile, R. G.; Fonzo, N. di

doi:10.1017/s0021859600084823

Cited by 33 publications

(28 citation statements)

References 20 publications

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“…Other authors reported changes in ΔF/Fm′, which can be correlated to Y(II) (Klughammer and Schreiber, 2008). A 20% decrease in ΔF/Fm′ was previously found during the formation of the fluorescence induction curve, while no great differences were observed between control and dehydrated durum wheat leaves under steady state conditions (Flagella et al, 1995). In the present experiment, the cold-induced drop in Y(II) recovered to the level at growth temperature (21°C) under the effect of mild water stress.…”

Section: Discussionsupporting

confidence: 53%

Reduced light and moderate water deficiency sustain nitrogen assimilation and sucrose degradation at low temperature in durum wheat

Majláth

Darkó

Palla

et al. 2016

Journal of Plant Physiology

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(I. Majláth). 2 SUMMARYThe rate of carbon and nitrogen assimilation is highly sensitive to stress factors, such as low temperature and drought. Little is known about the role of light in the simultaneous effect of cold and drought. The present study thus focused on the combined effect of mild water deficiency and different light intensities during the early cold hardening in durum wheat (Triticum turgidum ssp. durum L.) cultivars with different levels of cold sensitivity. The results showed that reduced illumination decreased the undesirable effects of photoinhibition in the case of net photosynthesis and nitrate reduction, which may help to sustain these processes at low temperature. Mild water deficiency also had a slight positive effect on the effective quantum efficiency of PSII and the nitrate reductase activity in the cold. Glutamine synthesis was affected by light rather than by water deprivation during cold stress. The invertase activity increased to a greater extent by water deprivation, but an increase in illumination also had a facilitating effect on this enzyme. This suggests that both moderate water deficiency and light have an influence on nitrogen metabolism and sucrose degradation during cold hardening. A possible rise in the soluble sugar content caused by the invertase may compensate for the decline in photosynthetic carbon assimilation indicated by the decrease in net photosynthesis. The changes in the osmotic potential can be also correlated to the enhanced level of invertase activity. Both of them were regulated by light at normal water supply, but not at water deprivation in the cold. However, changes in the metabolic enzyme activities and osmotic adjustment could not be directly contributed to the different levels of cold tolerance of the cultivars in the early acclimation period.

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Section: Discussionsupporting

confidence: 53%

Reduced light and moderate water deficiency sustain nitrogen assimilation and sucrose degradation at low temperature in durum wheat

Majláth

Darkó

Palla

et al. 2016

Journal of Plant Physiology

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“…On the oth-er hand, the high concentration of chlorophyll b which enhances the utilization of carbon (IV) oxide to produce carbohydrate in T.grandis could be attributed to its ability to withstand extreme weather events than other tree species examined (Larcher 1995;Falk et al 1996;Carter and Knapp 2001;Richardson et al 2002;Khaleghi et al 2012;See Heschel et al 2014). This confirmed with the findings of Ekanayake et al (2004), Pervial and Sheriffs (2002), Flagella et al (1995) that chlorophyll concentration provides rapid and accurate techniques of detecting and quantifying plant tolerance to stress. This implies that trees with higher foliar chlorophyll content could have the ability to withstand adverse weather events as would increase their adaptive capacity.…”

Section: Chlorophyll Concentrationsupporting

confidence: 90%

“…When chlorophyll absorbs light energy the molecules enters into a higher energy state in which it easily gives up an electron to the first available electron-accepting molecules nearby (Flagella et al 1995). Leaf chlorophyll probe is a powerful and sensitive intrinsic measurement of the photosynthetic process (Oquist and Wass 1988), which can be used to detect the influence of various environmental stress factors (Oyetunji et al 2007;Richardson et al 2002;Flagella et al 1995).…”

Section: Introductionmentioning

confidence: 99%

An Assesesment of Leaf Chlorophyll Concentration of Afforestation Tree Species in South-Eastern, Nigeria

Udeagha¹,

Shomkegh²,

Daniel³

2016

Journal of Forest and Environmental Science

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Leaf chlorophyll content provides valuable information about physiological status of plants. However, fewer studies have investigated the difference in chlorophyll concentration in leaves of tropical afforestation tree species. Therefore, this study examines the difference in foliar chlorophyll contents of six tropical afforestation tree species namely: Tectona grandis, Pentaclethra macrophylla, Piptademiastrum africanum, Azadirachta indica, Brachystegia eurycoma and Gmelina arborea found in the relict forest in Umudike, South east, Nigeria. A single factor experiment in a completely randomised design in three replicates was employed to analyse the rate of leaf chlorophyll contents. Fisher's least significant different was used to test for significance in mean difference in foliar chlorophyll contents between tree species at 95% confidence interval using analysis of variance. The results of this study showed a significant difference in foliar chlorophyll concentration between the tree species with Tectona grandis having a higher chlorophyll concentration than other trees this could be as a result of its higher vegetative activity which increases its primary productivity followed by Pentaclethra macrophylla while Azadirachta indica having least the chlorophyll concentration. The study further revealed that other indigenous tree species like Piptademiastrum africanum and Brachystegia eurycoma have higher chlorophyll concentration. Further studies should be carry out to examine factors that have contributed informed the differences in the chlorophyll concentration of these trees species, thus this would broaden the understanding of their physiological status and equally encourage there conservation.

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“…The decrease in the maximum quantum yield of PSII photochemistry (F v /F m ) implies a decrease in the capture and conversion rate of excitation energy by PS II reaction centres and so, a reduction in PS II photochemical efficiency (Flagella et al, 1995). These results indicate the disorganisation of PS II reaction centres under water stress conditions (Giardi et al, 1996).…”

Section: Discussionmentioning

confidence: 98%

“…This disorder appeared to be highly pronounced in TN88-63 (the moderately sensitive cowpea) than in B21 (the resistant cowpea). Otherwise, the increase in ABS/RC would be a survival strategy consisting in over-activity of unaltered reaction centres to maintain some energy absorption rate without compensating the lost of maximum quantum yield of photosystem II (Flagella et al, 1995). Sharma et al (2005) found that the overproduction of antioxidative enzymes (SOD and peroxidase) was accompanied by the reduction of the net photosynthetic rate, stomatal conductance and transpiration rate in wheat genotypes.…”

Section: Discussionmentioning

confidence: 99%

Water stress induces overexpression of superoxide dismutases that contribute to the protection of cowpea plants against oxidative stress

Brou¹,

Zeze²,

Diouf³

et al. 2007

Afr. J. Biotechnol.

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Water stress is known to induce active oxygen species in plants. The accumulation of these harmful species must be prevented by plants as rapidly as possible to maintain growth and productivity. The aim of this study was to determine the effect of water stress on superoxide dismutase isozymes (SOD, EC 1.15.1.1.) in two cowpea cultivars [Vigna unguiculata L. Walp., cv. Bambey 21 (B21) and cv. TN88-63]. Plants were submitted to water stress by withholding water supply and the expression of SOD was characterized during stress induction. In the same time, photosynthesis characteristics were determined through the measurement of the quantum yield of PS II photochemistry and the energy absorption rate per reaction centre. Results show how water stress regulates the synthesis and the activity of superoxide dismutase isoforms and how these enzymes contribute to protect photosynthesis against the damageable effects of superoxide radicals in cowpea. Increased MnSOD and FeSOD activity and concentration were shown to be induced by water stress and associated with protection of photosystem II photochemistry and whole plant growth against oxidative stress in these plants. On the contrary, plants unable to express high MnSOD and/or FeSOD isoforms showed more sensitivity to water stress.

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The quantum yield of photosynthetic electron transport evaluated by chlorophyll fluorescence as an indicator of drought tolerance in durum wheat

Cited by 33 publications

References 20 publications

Reduced light and moderate water deficiency sustain nitrogen assimilation and sucrose degradation at low temperature in durum wheat

Reduced light and moderate water deficiency sustain nitrogen assimilation and sucrose degradation at low temperature in durum wheat

An Assesesment of Leaf Chlorophyll Concentration of Afforestation Tree Species in South-Eastern, Nigeria

Water stress induces overexpression of superoxide dismutases that contribute to the protection of cowpea plants against oxidative stress

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