Nutrient Stress

Reddy, Kiran K.

doi:10.1007/1-4020-4225-6_7

Cited by 19 publications

(6 citation statements)

References 116 publications

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“…The appearance of visual features in plants affected by Mn toxicity varies with the type of plant species, plant age, temperature, and light level [ 70 – 72 ]. The symptoms may include crinkled leaves [ 73 ], darkening of leaf veins on older foliage [ 74 ], chlorosis and brown spots on aged leaves [ 75 ], and black specks on the stems [ 76 ]. Mn toxicity has been associated with a decreased CO 2 assimilation but unaffected chlorophyll (Chl) level in Citrus grandis seedlings [ 77 ] and depleted Chl content in pea ( Pisum sativum L.) [ 78 ] and soybean ( Glycine max L.) [ 79 ], indicating diversity among plant species in response to Mn excess.…”

Section: Effects Of Some Hms On Plantsmentioning

confidence: 99%

Heavy Metal Stress and Some Mechanisms of Plant Defense Response

Emamverdian

Ding

Mokhberdoran

et al. 2015

The Scientific World Journal

855

310

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Unprecedented bioaccumulation and biomagnification of heavy metals (HMs) in the environment have become a dilemma for all living organisms including plants. HMs at toxic levels have the capability to interact with several vital cellular biomolecules such as nuclear proteins and DNA, leading to excessive augmentation of reactive oxygen species (ROS). This would inflict serious morphological, metabolic, and physiological anomalies in plants ranging from chlorosis of shoot to lipid peroxidation and protein degradation. In response, plants are equipped with a repertoire of mechanisms to counteract heavy metal (HM) toxicity. The key elements of these are chelating metals by forming phytochelatins (PCs) or metallothioneins (MTs) metal complex at the intra- and intercellular level, which is followed by the removal of HM ions from sensitive sites or vacuolar sequestration of ligand-metal complex. Nonenzymatically synthesized compounds such as proline (Pro) are able to strengthen metal-detoxification capacity of intracellular antioxidant enzymes. Another important additive component of plant defense system is symbiotic association with arbuscular mycorrhizal (AM) fungi. AM can effectively immobilize HMs and reduce their uptake by host plants via binding metal ions to hyphal cell wall and excreting several extracellular biomolecules. Additionally, AM fungi can enhance activities of antioxidant defense machinery of plants.

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Section: Effects Of Some Hms On Plantsmentioning

confidence: 99%

Heavy Metal Stress and Some Mechanisms of Plant Defense Response

Emamverdian

Ding

Mokhberdoran

et al. 2015

The Scientific World Journal

855

310

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“…Iron (Fe) is utilized in a variety of essential biological processes such as the respiratory (Park et al 1996) and photosynthetic (Hung et al 2010) electron-transport chain reactions (Connolly and Guerinot 2002; Reddy 2006), due to its stable redox properties, specifically an ability to donate and accept electrons between both Fe +2 (ferrous) and Fe +3 (ferric) redox states. Although Fe is the fourth most abundant element in the earth’s crust, it is not readily available to soil growing plants under aerobic conditions due to its tendency to form insoluble Fe 3+ precipitates (Kim and Guerinot 2007).…”

Section: Introductionmentioning

confidence: 99%

Diurnal Changes in Transcript and Metabolite Levels during the Iron Deficiency Response of Rice

Selby‐Pham

Lutz

Moreno-Moyano

et al. 2017

Rice

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BackgroundRice (Oryza sativa L.) is highly susceptible to iron (Fe) deficiency due to low secretion levels of the mugineic acid (MA) family phytosiderophore (PS) 2′-deoxymugineic acid (DMA) into the rhizosphere. The low levels of DMA secreted by rice have proved challenging to measure and, therefore, the pattern of DMA secretion under Fe deficiency has been less extensively studied relative to other graminaceous monocot species that secrete high levels of PS, such as barley (Hordeum vulgare L.).ResultsGene expression and metabolite analyses were used to characterise diurnal changes occurring during the Fe deficiency response of rice. Iron deficiency inducible genes involved in root DMA biosynthesis and secretion followed a diurnal pattern with peak induction occurring 3–5 h after the onset of light; a result consistent with that of other Strategy II plant species such as barley and wheat. Furthermore, triple quadrupole mass spectrometry identified 3–5 h after the onset of light as peak time of DMA secretion from Fe-deficient rice roots. Metabolite profiling identified accumulation of amines associated with metal chelation, metal translocation and plant oxidative stress responses occurring with peak induction 10–12 h after the onset of light.ConclusionThe results of this study confirmed that rice shares a similar peak time of Fe deficiency associated induction of DMA secretion compared to other Strategy II plant species but has less prominent daily fluctuations of DMA secretion. It also revealed metabolic changes associated with the remediation of Fe deficiency and mitigation of damage from resulting stress in rice roots. This study complements previous studies on the genetic changes in response to Fe deficiency in rice and constitutes an important advance towards our understanding of the molecular mechanisms underlying the rice Fe deficiency response.Electronic supplementary materialThe online version of this article (doi:10.1186/s12284-017-0152-7) contains supplementary material, which is available to authorized users.

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“…Phosphorus deficiency can restrict plant growth by reducing shoot growth and leaf area and can inhibit photosynthesis by decreasing the light-saturation point, carboxylation efficiency, ribulose-1, 5-bisphosphate carboxylase/oxygenase (RuBisCo) regeneration, and electron transport rates (De Groot et al 2003; Jacob and Lawlor 1992; Radin and Eidenbock 1984; Yan et al 2015). Equally, potassium deficiency results in growth inhibition due to its involvement in a plethora of enzyme activities in addition to its role in maintaining membrane potential and cell turgor (Chinnusamy et al 2006; Liu et al 2000), cell elongation, osmoregulation, and promotion of photosynthetic rate (Reddy 2006). Few studies have quantified possible effects of the nutrient regime on Palmer amaranth.…”

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confidence: 99%

Differential Response of Palmer Amaranth (Amaranthus palmeri) Gender to Abiotic Stress

Korres¹,

Norsworthy²,

FitzSimons

et al. 2017

Weed Sci

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Knowledge of Palmer amaranth biology and physiology is essential for the development of effective weed management systems. The aim of this study was to investigate the response of Palmer amaranth gender to nutrient deficiency and light stress. Differential gender responses were observed for all the growth, phenology, and photochemistry parameters measured. Female plants, for example, invested more in height, stem, and total dry weight, whereas male plants invested more in leaf area and leaf dry weight. The growth rate of females was higher than that of male Palmer amaranth plants, although both followed similar declining trends as the experimental period progressed. Initiation of flowering of female plants occurred 6 to 8 d earlier compared with male plants. Nitrogen and to a certain extent phosphorous were the most influential nutrients that affected measured parameters in both Palmer amaranth genders, particularly under high light intensity. Electron transport rate and chlorophyll content of female Palmer amaranth plants compared with male plants was lower at high light intensity in combination with nitrogen and phosphorous deficiencies. There is a potential to manipulate Palmer amaranth population structure by altering microenvironments at the field level.

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Nutrient Stress

Cited by 19 publications

References 116 publications

Heavy Metal Stress and Some Mechanisms of Plant Defense Response

Heavy Metal Stress and Some Mechanisms of Plant Defense Response

Diurnal Changes in Transcript and Metabolite Levels during the Iron Deficiency Response of Rice

Differential Response of Palmer Amaranth (Amaranthus palmeri) Gender to Abiotic Stress

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