Exploitation of allelochemicals in improving crop productivity

Rizvi, S. J. H.; Rizvi, V.

doi:10.1007/978-94-011-2376-1_25

Cited by 46 publications

(33 citation statements)

References 50 publications

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“…In the light of the above-mentioned studies, the results presented here, which show a positive influence of juglone on tomato plants, are rather unique. However, if we take into consideration the fact that allelochemicals can be beneficial in one species and harmful in another one and that this depends on the type and concentration of the allelochemicals and on the duration of the treatment [16][17][18], the growth stimulation that was observed in the presented studies is not improbable. At present, it appears that there are some plants that are tolerant to juglone [24].…”

Section: Discussionmentioning

confidence: 89%

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Morpho-histological analysis of tomato (Solanum lycopersicum L.) plants after treatment with juglone

et al. 2017

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Juglone is a substance that limits plant growth and has a toxic effect on plant development. In this study, we analyzed the influence of juglone at two different concentrations (10 −3 M and 10 −4 M), which were applied to different parts of Solanum lycopersicum L. plants (root system, stem after decapitation, and surface of a younger leaf or after autografting) for a short period of time (7 days), on the morphology and histology of stems. At a lower concentration, juglone had positive effects on plant growth, which resulted in an increase in interfascicular cambial cell divisions, faster development of a continuous cambium layer along the stem circumference, and development of fibers. Additionally, under the influence of juglone, the number of developing leaves increased and adventitious roots developed. The results are discussed based on the current literature concerning the reaction of plants to juglone and to stress conditions.

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Section: Discussionmentioning

confidence: 89%

“…In most of the cases reported in literature, the effects of juglone on plants have generally been toxic [16][17][18]. Juglone has been found to be an inhibitor of seed germination in cress, tomato, cucumber, alfalfa, radish, and watermelon [8,[19][20][21].…”

Section: Discussionmentioning

confidence: 99%

Morpho-histological analysis of tomato (Solanum lycopersicum L.) plants after treatment with juglone

et al. 2017

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“…However, there are cases where the allelopathic effect is not only obvious in the germination process, but also in the occurrence of abnormalities, which makes the study of seedling growth a valuable tool in the field of allelopathy (Ferreira and Aquila, 2000). Allelochemicals can affect cytological structures, hormones, membrane permeability, absorption of minerals, stomatal movement, pigment synthesis, photosynthesis, respiration, protein synthesis, enzyme activity, water relations and cause changes in DNA and RNA (Rizvi and Rizvi, 1992;Ferreira and Aquila, 2000). Thus, abnormalities may be secondary consequences of effects that occur primarily at cellular and molecular levels.…”

Section: Initial Growth Bioassaymentioning

confidence: 99%

AUTOTOXICITY IN TOUGH LOVEGRASS ( Eragrostis plana )

2017

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ISSN 0100-8358 (print) 1806-9681 (online) AUTOTOXICITY IN TOUGH LOVEGRASS (Eragrostis plana) Autotoxicidade em Capim-annoni (Eragrostis plana)ABSTRACT -Autotoxicity in tough lovegrass has been analyzed in the field, but has never been tested in allelopathy bioassays. Therefore, this study aimed to verify and compare the autotoxicity of leaves and roots from aqueous extracts of tough lovegrass on its germination and early seedling growth. Extracts of green leaves (GL), senescent leaves (SL), and roots (R) at concentrations of 0.05, 0.15, and 0.25 g mL -1 were analyzed on how they affected seed germination and seedling growth. The extracts, regardless of the source or concentration of the material used, have significantly reduced germination percentage, index of germination speed, and root growth of seedlings of tough lovegrass. Effects on mean germination time and shoot length varied according to the origin and concentration of the extracts. GL, at concentrations 0.15 and 0.25 g mL -1 , showed the most damaging effect. In tough lovegrass, autotoxicity is a mechanism that may be involved in the control of germination and plant growth, which could explain the distance between their clumps in the field.Keywords: allelopathy, aqueous extracts, Eragrostis plana, germination. RESUMO -A autotoxicidade no capim-annoni é observada no campo, mas nunca

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“…One of the most important plant defences against fungal pathogens is the production of secondary metabolites (Singh et al, 2003). Plant secondary metabolites possess a wide range of biological activities leading to diverse types of interactions with other organisms (Rizvi and Rizvi, 1992;Einhellig, 1995). In this context, plant natural products offer a pool of structurally diverse antifungal agents, and may provide an alternative to synthetic fungicides to control phytopathogenic fungi (Duke 1990, Singh et al, 2003.…”

Section: Introductionmentioning

confidence: 99%

Induced plant secondary metabolites for phytopatogenic fungi control: a review

Ribera

Zúñiga

2012

J. Soil Sci. Plant Nutr.

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Pathogenic fungi constitute one of the main infectious agents in plants, causing alterations during developmental stages including post-harvest. Phytopathogenic fungi are controlled by synthetic fungicides; however, the use of these is progressively restricted due to both, the harmful effects of pesticides on the environment and human health and the appearance of highly resistant fungal strains. Therefore, there is a great demand for novel natural fungicides. Higher plants are rich source of bioactive secondary metabolites of wide variety such as tannins, terpenoids, saponins, alkaloids, flavonoids, and other compounds, reported to have in vitro antifungal properties. Thus, secondary metabolites with antifungal activity represent an alternative for achieving a sustainable control of phytopathogenic fungi and to reduce the heavy reliance of synthetic pesticides used to control them. Plant antifungal metabolites may be preformed inhibitors that are present constitutively in healthy plants (phytoanticipins), or they may be synthesized de novo in response to pathogen attack or another stress conditions (phytoalexins). These molecules may be used directly or considered as a precursor for developing better fungicidal molecules. This review presents a selection of antifungal agents induced in plants during fungal attack that can be potentially used for phytopathogenic fungi control in crops.

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Exploitation of allelochemicals in improving crop productivity

Cited by 46 publications

References 50 publications

Morpho-histological analysis of tomato (Solanum lycopersicum L.) plants after treatment with juglone

Morpho-histological analysis of tomato (Solanum lycopersicum L.) plants after treatment with juglone

AUTOTOXICITY IN TOUGH LOVEGRASS ( Eragrostis plana )

Induced plant secondary metabolites for phytopatogenic fungi control: a review

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