Long-term water stress leads to acclimation of drought sensitivity of photosynthetic capacity in xeric but not riparianEucalyptusspecies

AbstractWater deficit is one of the major limiting factors for apple (Malus domestica) production on the Loess Plateau, a major apple cultivation area in China. The identification of genes related to the regulation of water use efficiency (WUE) is a crucial aspect of crop breeding programs. As a conserved degradation and recycling mechanism in eukaryotes, autophagy has been reported to participate in various stress responses. However, the relationship between autophagy and WUE regulation has not been explored. We have shown that a crucial autophagy protein in apple, MdATG8i, plays a role in improving salt tolerance. Here, we explored its biological function in response to long-term moderate drought stress. The results showed that MdATG8i-overexpressing (MdATG8i-OE) apple plants exhibited higher WUE than wild-type (WT) plants under long-term moderate drought conditions. Plant WUE can be increased by improving photosynthetic efficiency. Osmoregulation plays a critical role in plant stress resistance and adaptation. Under long-term drought conditions, the photosynthetic capacity and accumulation of sugar and amino acids were higher in MdATG8i-OE plants than in WT plants. The increased photosynthetic capacity in the OE plants could be attributed to their ability to maintain optimal stomatal aperture, organized chloroplasts, and strong antioxidant activity. MdATG8i overexpression also promoted autophagic activity, which was likely related to the changes described above. In summary, our results demonstrate that MdATG8i-OE apple lines exhibited higher WUE than WT under long-term moderate drought conditions because they maintained robust photosynthesis, effective osmotic adjustment processes, and strong autophagic activity.

Download Full-text

Improving potato drought tolerance through the induction of long-term water stress memory

Plant Science ◽

10.1016/j.plantsci.2015.05.016 ◽

2015 ◽

Vol 238 ◽

pp. 26-32 ◽

Cited By ~ 30

Author(s):

D.A. Ramírez ◽

J.L. Rolando ◽

W. Yactayo ◽

P. Monneveux ◽

V. Mares ◽

...

Keyword(s):

Water Stress ◽

Drought Tolerance ◽

Stress Memory

Download Full-text

Some bioactive metabolites’ response to long-term water stress in red cabbage

Scientia Horticulturae ◽

10.1016/j.scienta.2021.110731 ◽

2022 ◽

Vol 293 ◽

pp. 110731

Author(s):

Okan Erken

Keyword(s):

Water Stress ◽

Bioactive Metabolites ◽

Red Cabbage

Download Full-text

Phosphorus as a mitigator of the effects of water stress on the growth and photosynthetic capacity of tropical C4 grasses

Acta Scientiarum Agronomy ◽

10.4025/actasciagron.v38i3.28454 ◽

2016 ◽

Vol 38 (3) ◽

pp. 363 ◽

Cited By ~ 2

Author(s):

Frank Akiyoshi Kuwahara ◽

Gustavo Maia Souza ◽

Kezia Aparecida Guidorizi ◽

Ciniro Costa ◽

Paulo Roberto de Lima Meirelles

Keyword(s):

Water Stress ◽

Crop Production ◽

Photosynthetic Capacity ◽

Panicum Maximum ◽

P Deficiency ◽

Tropical Grasses ◽

Tropical Forage ◽

Productive Potential ◽

Urochloa Decumbens ◽

Urochloa Brizantha

Water deficiency during the dry seasons influences the relationship between water and gas exchange in tropical grasses, reducing their productive potential. In addition, the phosphorus (P) deficiency Brazilian soils adds to the set of factors limiting crop production. In this context, the objective of this study was to evaluate the responses of different tropical forage species to phosphorus supplementation as mitigating the damage caused by water stress. Seeds of Urochloa brizantha cv. MG-4, Urochloa decumbens cv. Basilisk, Panicum maximum cv. Áries, Panicum maximum cv. Tanzânia and Paspalum atratum cv. Pojuca were germinated in pots containing 10 liters of red-yellow Acrisol type soil. Experiments were conducted by combining levels of phosphorus, 8,0 and 100,0 mg of P dm-3, with two irrigation regimes, 100 and 40% replacement of transpired water. The biometric parameters, photosynthetic capacity, leaf water potential and soil chemical characteristics were evaluated, and the data was submitted to analysis of variance (ANOVA, p < 0.05), and subsequently the means were compared using a Tukey test (p < 0.05). The results showed for tropical grasses grown under water stress, there is a clear mitigating effect of phosphorus supplementation, especially on the maintenance of biomass growth.

Download Full-text

Drought Sensitivity at Various Growth Stages of Barley in Relation to Relative Evapotranspiration and Water Stress 1

Agronomy Journal ◽

10.2134/agronj1980.00021962007200060040x ◽

1980 ◽

Vol 72 (6) ◽

pp. 1033-1038 ◽

Cited By ~ 20

Author(s):

V. Overgaard Mogensen

Keyword(s):

Water Stress ◽

Growth Stages ◽

Drought Sensitivity

Download Full-text

Stomatal and non-stomatal limitations of photosynthesis under water stress in field-grown grapevines

Functional Plant Biology ◽

10.1071/pp99019 ◽

1999 ◽

Vol 26 (5) ◽

pp. 421 ◽

Cited By ~ 99

Author(s):

J. M. Escalona ◽

J. Flexas ◽

H. Medrano

Keyword(s):

Water Stress ◽

Stomatal Conductance ◽

Relative Increase ◽

Apparent Quantum Yield ◽

Intrinsic Water Use Efficiency ◽

Regulation Mechanisms ◽

Use Efficiency ◽

Alternative Processes ◽

Stomatal Limitations

Long-term induced water stress in field-grown grapevine leads to a progressive decline of stomatal conductance, accompanied by a decrease in CO 2 assimilation (40%). The apparent quantum yield also decreases (59%), which may reflect a relative increase in alternative processes for electron consumption. There is also a shift to non-stomatal regulation, as judged from significant depletions (37%) in maximum photosynthesis rate at saturating CO 2 related to limited ribulose biphosphate (RuBP) regeneration, whereas small, non-significant effects are observed on carboxylation efficiency. A high correlation (87%) between photosynthesis and stomatal conductance is observed for all experimental data and declines in intercellular CO 2 concentration parallel reductions in stomatal conductance. The data show that field response of grapevines to increasing soil water deficit involves stomatal and non-stomatal effects but, due to gradually induced drought, regulation mechanisms able to adjust mesophyll capacity to the average CO 2 supply. The non-stomatal adjustment seems to be exerted mainly in metabolic pathways related with the RuBP regeneration. Contrasting characteristics were observed for both cultivars. Tempranillo exploited the non-stressful conditions successfully, whereas Manto Negro, responding to its reputation as more drought resistant, showed a higher intrinsic water use efficiency, particularly for low water availability. This advantage seems to be due to lower non-stomatal limitations.

Download Full-text

Oxidative stress, leaf photosynthetic capacity and dry matter content in young mangrove plant Rhizophora mucronata Lam. under prolonged submergence and soil water stress

Physiology and Molecular Biology of Plants ◽

10.1007/s12298-020-00843-w ◽

2020 ◽

Vol 26 (8) ◽

pp. 1609-1622

Author(s):

Kodikara Arachchilage Sunanda Kodikara ◽

Ranasinghe Pathmasiri ◽

Aziz Irfan ◽

Jayatissa Loku Pullukuttige ◽

Sanduni Kanishka Madarasinghe ◽

...

Keyword(s):

Oxidative Stress ◽

Water Stress ◽

Soil Water ◽

Dry Matter ◽

Photosynthetic Capacity ◽

Matter Content ◽

Dry Matter Content ◽

Rhizophora Mucronata ◽

Mangrove Plant ◽

Soil Water Stress

Download Full-text

Some aspects of carbon relations in the barley – Helminthosporium teres complex. II. The effects of infection upon net accumulation of carbon in the tissues

Canadian Journal of Botany ◽

10.1139/b79-030 ◽

1979 ◽

Vol 57 (3) ◽

pp. 208-214 ◽

Cited By ~ 1

Author(s):

Janet Rowe ◽

J. Reid

Keyword(s):

Diurnal Cycle ◽

Photosynthetic Capacity ◽

Dark Period ◽

Light Period ◽

Complex Ii ◽

Long Term Experiments ◽

Ca 50 ◽

Translocation Experiments

First leaves of seedlings of the barley varieties Parkland (susceptible) and C.I. 5791 (resistant) were inoculated with Helminthosporium teres and the net accumulation of carbon (NA) in such leaves and in the uninoculated second leaves of these plants was examined in long-term experiments. In infected leaves of Parkland, NA in the light period of the diurnal cycle was maintained near the levels of controls even when photosynthetic capacity had decreased by ca. 50%, though NA in the dark period had increased 300–400%. However, neither this carbon nor that entering metabolism via β-carboxylation in the light was sufficient to compensate for the loss of photosynthetic capacity over 24 h. Translocation experiments showed that while infection did not increase the movement of carbon from the uninoculated second to infected first leaves, export of carbon by the first leaves (normally high) was greatly reduced, and this retained photosynthate appeared largely responsible for the maintenance of NA in the infected leaves. NA in the uninoculated second leaves of infected plants was reduced only while these leaves were heavily dependent on the first leaves for photosynthate. In infected leaves of C.I. 5791, though photosynthetic capacity dropped and β-carboxylation increased while the pathogen was developing, there was little effect on NA over 24 h. The implications of the effects of infection on NA are discussed.

Download Full-text