Drought- and ABA-induced changes in photosynthesis of barley plants

Попова, Л. Л.; Tsonev, Tsonko; Lazova, Galia N.; Stoinova, Zhivka G.

doi:10.1034/j.1399-3054.1996.960411.x

Cited by 12 publications

(15 citation statements)

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“…We have made similar observations with wheat and rye plants grown in waterlogged soil (Salcheva and Popova 1982). An increase in PEPC activity has been reported and for barley plants exposed to drought or salinity (Popova et al 1996;Tsonev et al 1988) or after exogenous treatment with ABA (Popova et al 1995). One possible explanation might be a decrease in mesophyll conductance, which may cause a decrease in the chloroplast CO 2 concentration in the vicinity of RuBPC.…”

Section: Discussionmentioning

confidence: 95%

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Flooding-induced changes in photosynthesis and oxidative status in maize plants

2007

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Maize plants (Zea mays L.) were subjected to soil flooding for 72, 96, and 120 h. A noticeable decrease in the rate of net photosynthesis (P N ) and the activity of ribulose-1,5-bisphosphate carboxylase (RuBPC, EC 4.1.1.39) were observed. The values of intercellular CO 2 concentrations (c i ) increased in all flooded plants without significant changes in stomatal conductance (g s ). The activity of phosphoenolpyruvate carboxylase (PEPC, EC 4.1.1.31) increased twofold 120 h after soil flooding. Flooding of maize plants led to a decrease in chlorophyll and protein levels and to slight increase of proline content. Flooded plants exhibited a large accumulation of leaf acidity. An increase in the values of some important parameters associated with oxidative stress, namely peroxides production, lipid peroxidation, and electrolyte leakage, confirmed the suggestion that root oxygen deficiency caused photooxidative damage in maize leaves.

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Section: Discussionmentioning

confidence: 95%

“…RuBPC (EC 4.1.1.39) and PEPC (EC 4.1.1.31) activities were assayed from the activated crude preparation by following the incorporation of NaH 14 CO 3 into acid stable products as described earlier (Popova et al 1996).…”

Section: Enzyme Extraction and Assaysmentioning

confidence: 99%

Flooding-induced changes in photosynthesis and oxidative status in maize plants

2007

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“…It is difficult to distinguish whether the reduction in photosynthesis seen under stress conditions is exclusively related to the decrease in substomatal CO 2 (Ci) concentration caused by the impact of ABA on stomatal closure, or if there is some other direct biochemical inhibition of photosynthesis. This issue has long been debated (Mawson et al, 1981;Raschke and Hedrich, 1985;Downton et al, 1988;Popova et al, 1996;Liang et al, 1997) and, to the best of our knowledge, no conclusive physiological evidence has been reported. Several reviews have concluded that ABA might have differential modes of action, according to which, during mild drought stress, the decrease in photosynthesis correlates mainly with Ci (i.e.…”

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confidence: 91%

Mesophyll Abscisic Acid Restrains Early Growth and Flowering But Does Not Directly Suppress Photosynthesis

et al. 2019

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Abscisic acid (ABA) levels increase significantly in plants under stress conditions, and ABA is thought to serve as a key stressresponse regulator. However, the direct effect of ABA on photosynthesis and the effect of mesophyll ABA on yield under both well-watered and drought conditions are still the subject of debate. Here, we examined this issue using transgenic Arabidopsis (Arabidopsis thaliana) plants carrying a dominant ABA-signaling inhibitor under the control of a mesophyll-specific promoter (FBPase::abi1-1, abbreviated to fa). Under normal conditions, fa plants displayed slightly higher stomatal conductance and carbon assimilation than wild-type plants; however, these parameters were comparable following ABA treatment. These observations suggest that ABA does not directly inhibit photosynthesis in the short term. The fa plants also exhibited a variety of altered phenotypes under optimal conditions, including more vigorous initial growth, earlier flowering, smaller flowers, and delayed chlorophyll degradation. Furthermore, under optimal conditions, fa plant seed production was less than a third of that observed for the wild type. However, under drought conditions, wild-type and fa seed yields were similar due to a significant reduction in wild-type seed and no reduction in fa seed. These findings suggest that endogenous basal ABA inhibits a stress-escape response under nonstressed conditions, allowing plants to accumulate biomass and maximize yield. The lack of a correlation between flowering time and plant biomass combined with delayed chlorophyll degradation suggests that this stress-escape behavior is regulated independently and upstream of other ABA-induced effects such as rapid growth and flowering.

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“…reduce stomatal conductance and photosynthesis (Popova et al, 1996). In addition to competition, allelopathic chemicals from certain grasses may inhibit growth of nearby plants.…”

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confidence: 99%

Response of Potted Peach Trees to Pruning and Grass Competition

Tworkoski¹

2000

HortSci

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Peach [(Prunus persica (L.) Batsch., `Rutgers Redleaf'] trees were grown for two seasons in a greenhouse with three pruning treatments (none, shoot tips removed, and half the shoots removed) and three grass treatments (no grass competition; perennial ryegrass, Lolium perenne L., `Linn'; and tall fescue, Festuca arundinacea Schreb, `Kentucky 31'). Competing grass reduced shoot growth, leaf area, and weight of fine roots in shallow soil, but did not affect the growth response to pruning. Regrowth from pruned trees was such that the shoot: root ratio was restored to that of unpruned trees. Leaf water potential, stomatal conductance, and photosynthesis had decreased markedly by 48 hours after irrigation ceased in trees without competition (larger trees) and to a similar level by 96 hours in trees with competition (smaller trees). Apparently, the reduced leaf area of peach trees grown with grass competition delayed water stress. Leaf abscisic acid levels were not directly affected by grass competition but increased as leaf water potential decreased. Grass competition modified morphology and reduced tree size, but did not affect shoot growth following pruning.

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Drought- and ABA-induced changes in photosynthesis of barley plants

Cited by 12 publications

References 0 publications

Flooding-induced changes in photosynthesis and oxidative status in maize plants

Flooding-induced changes in photosynthesis and oxidative status in maize plants

Mesophyll Abscisic Acid Restrains Early Growth and Flowering But Does Not Directly Suppress Photosynthesis

Response of Potted Peach Trees to Pruning and Grass Competition

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