Nutrient seed priming improves seedling development of maize exposed to low root zone temperatures during early growth

Imran, Muhammad; Muhammad, Asim; Römheld, Volker; Neumann, Günter

doi:10.1016/j.eja.2013.04.001

Cited by 117 publications

(97 citation statements)

References 48 publications

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“…These results indicate that nutrient deficiency stress induced by cold can be overcome by supplying SWEs rich in micronutrients to improve oxidative stress tolerance. Previous studies with corn seedlings under root chilling stress supplemented with micronutrients demonstrated the utility of nutrient seed priming [68].…”

Section: Algal Extractsmentioning

confidence: 99%

The role of biostimulants and bioeffectors as alleviators of abiotic stress in crop plants

Oosten

Pepe

Pascale

et al. 2017

Chem. Biol. Technol. Agric.

654

399

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The use of bioeffectors, formally known as plant biostimulants, has become common practice in agriculture and provides a number of benefits in stimulating growth and protecting against stress. A biostimulant is loosely defined as an organic material and/or microorganism that is applied to enhance nutrient uptake, stimulate growth, enhance stress tolerance or crop quality. This review is intended to provide a broad overview of known effects of biostimulants and their ability to improve tolerance to abiotic stresses. Inoculation or application of extracts from algae or other plants have beneficial effects on growth and stress adaptation. Algal extracts, protein hydrolysates, humic and fulvic acids, and other compounded mixtures have properties beyond basic nutrition, often enhancing growth and stress tolerance. Non-pathogenic bacteria capable of colonizing roots and the rhizosphere also have a number of positive effects. These effects include higher yield, enhanced nutrient uptake and utilization, increased photosynthetic activity, and resistance to both biotic and abiotic stresses. While most biostimulants have numerous and diverse effects on plant growth, this review focuses on the bioprotective effects against abiotic stress. Agricultural biostimulants may contribute to make agriculture more sustainable and resilient and offer an alternative to synthetic protectants which have increasingly falling out of favour with consumers. An extensive review of the literature shows a clear role for a diverse number of biostimulants that have protective effects against abiotic stress but also reveals the urgent need to address the underlying mechanisms responsible for these effects.

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Section: Algal Extractsmentioning

confidence: 99%

The role of biostimulants and bioeffectors as alleviators of abiotic stress in crop plants

Oosten

Pepe

Pascale

et al. 2017

Chem. Biol. Technol. Agric.

654

399

View full text Add to dashboard Cite

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“…Fertilizer placement close to the seedling roots is currently the most widely employed approach to support root uptake of limiting nutrients, such as P and N, in some cases also including Zn, Mn, and Fe as micronutrients. Imran et al [14] demonstrated that even soaking seeds in (Zn, Mn, Fe) micronutrient solutions (seed nutrient priming) could partially restore root growth and nutrient uptake of maize seedlings exposed to low RZT of 12 °C, associated with a final yield increase of 10 % in two independent field experiments. 2.…”

Section: Introductionmentioning

confidence: 99%

“…The selected mitigation strategies comprised (1) fertigation and seed treatments with micronutrients (Zn, Mn) important for oxidative stress defense [14,17]; (2) fertigation with seaweed extracts of different origins; and (3) inoculation with plant growth-promoting and psychrotolerant bacteria.…”

Section: Introductionmentioning

confidence: 99%

Micronutrients (Zn/Mn), seaweed extracts, and plant growth-promoting bacteria as cold-stress protectants in maize

Bradáčová

Weber

Moradtalab

et al. 2016

Chem. Biol. Technol. Agric.

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Background: Low soil temperature in spring is a major constraint for cultivation of tropical crops in temperate climates, associated with impaired seedling development, inhibition of root growth and root activity. In this study, potential cold-stress protectants, such as supplemented micronutrients (Zn, Mn), seaweed extracts, and rhizobacteria with plant growth-promoting potential (PGPRs) were tested in order to improve the tolerance of maize to low root zone temperatures (RZT) during early growth.Methods: Maize (v. Colisee) was cultivated in a root cooling system for adjustment of the RZT. In three independent experiments, after germination at 20 °C, the cold-stress phase (12-14 °C) started at 14 days after sowing to simulate a cold period in spring. Micronutrients, seaweed extracts, and PGPRs were supplied by fertigation (experiment 1), fertigation and seed dressing (experiment 2), and nutrient seed priming (experiment 3). At the end of the experiments, scoring of oxidative leaf damage, biomass production, chlorophyll status (SPAD), root length density, superoxide dismutase activities in leaf and root tissues, and the shoot mineral-nutritional status were determined. Results:Positive effects on plant growth and particularly on root development at low RZT were detected exclusively for seaweed extracts with high Zn/Mn contents and similar growth promotions were induced by Zn and Mn application in comparable amounts. This finding suggests that the selected seaweed extracts were mainly acting via improved Zn and Mn supply to the plants. It was essential that the cold-stress protectants were present during seed imbibition. The beneficial effect of Zn/Mn treatments and sea weed extracts was associated with increased superoxide dismutase activity in the root and leaf tissue, with key functions in antioxidative stress defense, depending on Zn, Mn, Cu, and Fe as enzymatic co-factors. Accordingly, leaf damage, shoot and root growth inhibition in cold-stressed plants was associated with a low Zn-nutritional status, mitigated by application of the cold-stress protectants. Conclusions:Since micronutrients are effective already at low concentrations, starter applications of Zn/Mn or the respective seaweed extracts may offer an economic option for cold-stress prophylaxis in crops.

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“…Generally, growth processes increase root length and volume by cell division and elongation, whereas development controls the period of growth and initiation of new roots (Imran et al 2013). Temperature has been reported to affect root initiation, orientation of growth, turnover, and branching under field conditions (Kaspar and Bland 1992).…”

Section: Root Growth Parametersmentioning

confidence: 99%

Growth and physiological trait variation among corn hybrids for cold tolerance

et al. 2016

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Global food demand has risen continuously because of increasing population with greater food and energy needs. Corn production, however, is constrained by current and possible increased future variability in the weather. Earlier planting is a strategy for U.S. Mid-South corn producers to avoid typical summer droughts. However, planting early will increase the likelihood of seedlings exposure to cold temperatures. The objectives of this study were to evaluate corn hybrids planted when the conditions are desirable followed by low and moderately low temperatures to assess the variability among the vegetative and physiological parameters and to classify hybrids into different cold tolerant groups. Twenty one commercially-grown hybrids were subjected to three day/night temperature treatments; 29/21°C (optimum), 25/17°C (moderately low), and 21/13°C (low) from 15 d after planting (DAP) for plants grown at optimum temperature. Shoot, root, and physiological parameters were measured, 32-34 DAP. Significant differences and interactions were observed among the temperature treatments and hybrids for most of the traits measured. Based on relative scores, developed in this study, AR1262 and P1636YHR were classified as cold tolerant and H68B and ST11504VT3 as cold sensitive. Cold tolerant hybrids and their associated morpho-physiological characteristics may be useful for breeders to develop new hybrids that could withstand low and variable temperatures during seedling growth and developmental period.Key words: cold tolerance, maize, fluorescence, growth indices, photosynthesis, stomatal conductance.Résumé : La demande mondiale d'aliments ne cesse d'augmenter en raison de la croissance démographique, qui accentue les besoins en nourriture et en énergie. Malheureusement, la production de maïs est affectée par la variabilité actuelle du climat, laquelle pourrait s'intensifier dans l'avenir. Les producteurs du centre-sud des États-Unis sèment le maïs hâtivement pour éviter les sécheresses usuelles de l'été. Cependant, les semis précoces augmentent la probabilité que les plantules soient exposées au froid. La présente étude devait évaluer des hybrides plantés à un moment où les conditions étaient favorables, avant une période de fléchissement important ou modéré des températures, cela en vue d'établir la variabilité des paramètres végétatifs et physiologiques de ces hybrides et de les classer en différents groupes en fonction de leur tolérance au froid. Vingt-et-un hybrides commerciaux ont été soumis à trois régimes de températures diurnes/ nocturnes : 29/21°C (régime optimal), 25/17°C (régime modérément bas) et 21/13°C (régime bas), 15 jours après repiquage des plants cultivés à température optimale. Les auteurs ont évalué les pousses, les racines et les paramètres physiologiques entre le 32 e et le 34 e jour suivant la plantation. D'importantes variations et interactions ont été relevées pour la plupart des caractères examinés entre les différents traitements et hybrides. Selon les notes relatives établies dans le cadr...

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Nutrient seed priming improves seedling development of maize exposed to low root zone temperatures during early growth

Cited by 117 publications

References 48 publications

The role of biostimulants and bioeffectors as alleviators of abiotic stress in crop plants

The role of biostimulants and bioeffectors as alleviators of abiotic stress in crop plants

Micronutrients (Zn/Mn), seaweed extracts, and plant growth-promoting bacteria as cold-stress protectants in maize

Growth and physiological trait variation among corn hybrids for cold tolerance

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