Elevated atmospheric CO2 concentration leads to different salt resistance mechanisms in a C3 (Chenopodium quinoa) and a C4 (Atriplex nummularia) halophyte

Geißler, Nicole; Hussin, Sayed; El-Far, Mervat M.M.; Koyro, Hans‐Werner

doi:10.1016/j.envexpbot.2015.06.003

Cited by 63 publications

(60 citation statements)

References 63 publications

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“…In fact, we detected high ROS (O 2 •‐ , H 2 O 2 ) production with reduced P net . These findings confirm the previous assumption of Geissler et al () and Miranda‐Apodaca et al () and reveal that high ROS production limits the salt tolerance in quinoa. The lipid peroxidation induced by high ROS production under salt stress measured in terms of MDA contents was more obvious in leaf than root tissues (Fig.…”

Section: Discussionsupporting

confidence: 92%

“…This happens because the electron transport rate and the consequent energy molecules (e.g ATP) production exceed the Calvin cycle demands if the absorption of energy does not decrease. Geissler et al (2015) and Miranda-Apodaca et al (2018) observed a higher ratio of electron transport rate to gross CO 2 assimilation (ETR/A gross ), which corresponds to the possibility of high ROS production because more electrons are transferred through electron transport chain per fixed CO 2 molecule. Recently, Iqbal et al (2018a) also revealed that ROS production decreases drought tolerance in quinoa.…”

Section: Antioxidant Defense System Induces Photo-protection In Leavesmentioning

confidence: 99%

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Soil drenching of paclobutrazol: An efficient way to improve quinoa performance under salinity

Waqas

Chen

Iqbal

et al. 2018

Physiologia Plantarum

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Salinity extent and severity is rising because of poor management practices on agricultural lands, possibility lies to grow salt-tolerant crops with better management techniques. Therefore, a highly nutritive salt-tolerant crop quinoa with immense potential to contribute for future food security was selected for this investigation. Soil drenching of paclobutrazol (PBZ; 20 mg l ) was used to understand the ionic relations, gaseous exchange characteristics, oxidative defense system and yield under saline conditions (400 mM NaCl) including normal (0 mM NaCl) and no PBZ (0 mg l ) as controls. The results revealed that salinity stress reduced the growth and yield of quinoa through perturbing ionic homeostasis with the consequences of overproduction of reactive oxygen species (ROS), oxidative damages and reduced photosynthesis. PBZ improved the quinoa performance through regulation of ionic homeostasis by decreasing Na , Cl , while improving K , Mg and Ca concentration. It also enhanced the antioxidative system including ascorbic acid, phenylalanine ammonia-lyase, polyphenol oxidase and glutathione peroxidase, which scavenged the ROS (H O and O ) and lowered the oxidative damages (malondialdehyde level) under salinity in roots and more specifically in leaf tissues. The photosynthetic rate and stomatal conductance consequently improved (16 and 21%, respectively) in salt-stressed quinoa PBZ-treated compared to the non-treated ones and contributed to the improvement of panicle length (33%), 100-grain weight (8%) and grain yield (38%). Therefore, PBZ can be opted as a shotgun approach to improve quinoa performance and other crops under high saline conditions.

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Section: Discussionsupporting

confidence: 92%

Section: Antioxidant Defense System Induces Photo-protection In Leavesmentioning

confidence: 99%

Soil drenching of paclobutrazol: An efficient way to improve quinoa performance under salinity

Waqas

Chen

Iqbal

et al. 2018

Physiologia Plantarum

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“…At low salinity, a small increment in c a produces a large reduction in water losses in the salt‐tolerant species, implying an increment in WUE . This result is in agreement with several experiments performed in controlled environments (Nicolas et al ., ; Geissler et al ., , , ; Melgar et al ., ; Mateos‐Naranjo et al ., ; Pérez‐Romero et al ., , ). Moreover, the value of C at which T r is maximum shifts to higher C values with increasing c a .…”

Section: Discussionmentioning

confidence: 97%

Xylem–phloem hydraulic coupling explains multiple osmoregulatory responses to salt stress

2019

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Summary Salinity is known to affect plant productivity by limiting leaf‐level carbon exchange, root water uptake, and carbohydrates transport in the phloem. However, the mechanisms through which plants respond to salt exposure by adjusting leaf gas exchange and xylem–phloem flow are still mostly unexplored. A physically based model coupling xylem, leaf, and phloem flows is here developed to explain different osmoregulation patterns across species. Hydraulic coupling is controlled by leaf water potential, ψl, and determined under four different maximization hypotheses: water uptake (1), carbon assimilation (2), sucrose transport (3), or (4) profit function – i.e. carbon gain minus hydraulic risk. All four hypotheses assume that finite transpiration occurs, providing a further constraint on ψl. With increasing salinity, the model captures different transpiration patterns observed in halophytes (nonmonotonic) and glycophytes (monotonically decreasing) by reproducing the species‐specific strength of xylem–leaf–phloem coupling. Salt tolerance thus emerges as plant's capability of differentiating between salt‐ and drought‐induced hydraulic risk, and to regulate internal flows and osmolytes accordingly. Results are shown to be consistent across optimization schemes (1–3) for both halophytes and glycophytes. In halophytes, however, profit‐maximization (4) predicts systematically higher ψl than (1–3), pointing to the need of an updated definition of hydraulic cost for halophytes under saline conditions.

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“…These values are considered to be higher in comparison with other crops that makes quinoa as a crop with high nitrogen accumulation rate in the aerial biomass (Ye et al, 2007;Geissler et al, 2015). In addition, the average range of change in nitrogen content in the plant had a positive and significant correlation with root density and dry matter of quinoa (Kakabouki, 2016).…”

Section: Discussionmentioning

confidence: 99%

Influence of fertilization and soil tillage on nitrogen uptake and utilization efficiency of quinoa crop ( Chenopodium quinoa Willd.).

Kakabouki

Hela

Roussis

et al. 2018

J. Soil Sci. Plant Nutr.

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In recent years, quinoa (Chenopodium quinoa Willd.) has attached the interest as a multi-purpose crop. A 3-year field experiment was conducted to determine the effects of tillage systems and fertilization on nitrogen uptake and use efficiency of quinoa crop. The experiment was laid out in a split-plot design with two replicates, two ) were found in N2. Nitrogen harvest index and nitrogen utilization efficiency were up to 60% lower and 40% lower, respectively, in inorganic treatments than in the control. Rates of nitrogen higher than 100 kg N ha -1 (N1) did not increase the nitrogen agronomic efficiency. Regarding apparent nitrogen recovery efficiency, the higher values observed under inorganic fertilization and being greater than 100%. The highest rates of change of nitrate reduction in soil (-0.108 to -0.188 N% day -1 ) and nitrogen increase in plant (0.025 to 0.027 N% day -1 ) were observed under N2 treatment. As a conclusion, quinoa has a high capacity to take up nitrate from the soil, but presents lower nitrogen remobilization from the vegetative parts into the seeds under high nitrogen supply.

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Elevated atmospheric CO2 concentration leads to different salt resistance mechanisms in a C3 (Chenopodium quinoa) and a C4 (Atriplex nummularia) halophyte

Cited by 63 publications

References 63 publications

Soil drenching of paclobutrazol: An efficient way to improve quinoa performance under salinity

Soil drenching of paclobutrazol: An efficient way to improve quinoa performance under salinity

Xylem–phloem hydraulic coupling explains multiple osmoregulatory responses to salt stress

Influence of fertilization and soil tillage on nitrogen uptake and utilization efficiency of quinoa crop ( Chenopodium quinoa Willd.).

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