Seed treatments with Trichoderma harzianum alleviates biotic, abiotic and physiological stresses in germinating seeds and seedlings.

16:37 EST 28th November 2014 | BioPortfolio

Summary of "Seed treatments with Trichoderma harzianum alleviates biotic, abiotic and physiological stresses in germinating seeds and seedlings."

Trichoderma spp. are endophytic plant symbionts that are widely used as seed treatments to control diseases and to enhance plant growth and yield. While some recent work has been published on their abilities to alleviate abiotic stresses, specific knowledge of mechanisms, abilities to control multiple plant stress factors and their effects on seeds and seedlings is lacking. We examined the effects of seed treatment with T. harzianum strain T22 on germination of seeds exposed to biotic stress (seed and seedling disease caused by Pythium ultimum) and abiotic stresses (osmotic, salinity, chilling, or heat stress). We also evaluated the ability of the beneficial fungus to overcome physiological stress (poor seed quality induced by seed aging). If seeds were not under any of the stresses noted above, T22 generally had little effect upon seedling performance. However, under stress treated seeds germinated consistently faster and more uniformly than untreated seeds whether the stress was osmotic, salt or suboptimal temperatures. The consistent response to varying stresses suggests a common mechanism through which the plant-fungal association enhances tolerance to a wide range of abiotic stresses as well as biotic stress. A common factor that negatively affects plants under these stress conditions is accumulation of toxic reactive oxygen species (ROS), and we tested the hypothesis that T22 reduced damages resulting from accumulation of ROS in stressed plants. Treatment of seeds reduced accumulation of lipid peroxides in seedlings under osmotic stress or in aged seeds. In addition, we showed the effect of exogenous application of an antioxidant, glutathione, or application of T22, resulted in similar positive effect on seed germination under osmotic stress or in aged seeds. These evidences support the model that Trichoderma harzianum strain T22 increases seedling vigor and ameliorates stress by inducing plants physiological protection against oxidative damage.

Affiliation

Cornell University, Horticultural Science, 630 W. North Street, Sturtevant Hall, Geneva, New York, United States, 14456; fm79@cornell.edu ;

Journal Details

This article was published in the following journal.

Name: Phytopathology
ISSN: 0031-949X
Pages:

Links

PubMed Articles [4513 Associated PubMed Articles listed on BioPortfolio]

Transcriptome Profile of Trichoderma harzianum IOC-3844 Induced by Sugarcane Bagasse.

Profiling the transcriptome that underlies biomass degradation by the fungus Trichoderma harzianum allows the identification of gene sequences with potential application in enzymatic hydrolysis proces...

Colonization of Onions by Endophytic Fungi and Their Impacts on the Biology of Thrips tabaci.

Endophytic fungi, which live within host plant tissues without causing any visible symptom of infection, are important mutualists that mediate plant-herbivore interactions. Thrips tabaci (Lindeman) is...

Phylogeny of the clinically relevant species of the emerging fungus Trichoderma and their antifungal susceptibilities.

A set of 73 isolates of the emerging fungus Trichoderma isolated from human and animal clinical specimens were characterized morphologically and molecularly using a multilocus sequence analysis that i...

A novel fungal metabolite with beneficial properties for agricultural applications.

Trichoderma are ubiquitous soil fungi that include species widely used as biocontrol agents in agriculture. Many isolates are known to secrete several secondary metabolites with different biological a...

Validation of a Novel Sequential Cultivation Method for the Production of Enzymatic Cocktails from Trichoderma Strains.

The development of new cost-effective bioprocesses for the production of cellulolytic enzymes is needed in order to ensure that the conversion of biomass becomes economically viable. The aim of this s...

Clinical Trials [217 Associated Clinical Trials listed on BioPortfolio]

The Effect of Grape Seed Extract on Blood Pressure in People With Pre-Hypertension

In this research study, the investigators are interested in learning how extracts from grape seeds can help those individuals with high blood pressure. The investigators also hope to learn...

Treatment of Bronchial Asthma With Borage and Echium Seed Oils

The aim of this trial is to determine the efficacy of a combination of two botanicals oils, borage seed oil and echium seed oil, as a potential treatment for bronchial asthma.

The Effect of Grape Seed Extract on Estrogen Levels of Postmenopausal Women

The role of estrogens in the pathogenesis of breast cancer has been well documented. This has led to the development of "Anti-Estrogens" (selective estrogens receptor modulators and Aromat...

Intervention With Black Currant Seed Press Residues in Healthy Subjects

The study was performed to investigate the effects of the consumption of black currant seed press residues, which were baked into bread.

Effect of Grape Seed Extract Plus Ascorbic Acid on Endothelial Function

A pilot study of 15 subjects will be conducted to confirm an acute effect of grape seed extract on endothelial function. We then will perform a a randomized, double blind, placebo controll...

Medical and Biotech [MESH] Definitions

That portion of the electromagnetic spectrum immediately below the visible range and extending into the x-ray frequencies. The longer wavelengths (near-UV or biotic or vital rays) are necessary for the endogenous synthesis of vitamin D and are also called antirachitic rays; the shorter, ionizing wavelengths (far-UV or abiotic or extravital rays) are viricidal, bactericidal, mutagenic, and carcinogenic and are used as disinfectants.

Treatments which are undergoing clinical trials or for which there is insufficient evidence to determine their effects on health outcomes; coverage for such treatments is often denied by health insurers.

One or more types of plant seed proteins providing the large amounts of AMINO ACIDS utilized in GERMINATION and SEEDLING growth. As seeds are the major food source from AGRICULTURAL CROPS, seed storage proteins are a major source of DIETARY PROTEINS.

The state of failure to complete the process of GERMINATION of an intact viable seed, due to intrinsic physical, molecular, genetic, or physiological parameters under otherwise favourable prevailing conditions.

Studies comparing two or more treatments or interventions in which the subjects or patients, upon completion of the course of one treatment, are switched to another. In the case of two treatments, A and B, half the subjects are randomly allocated to receive these in the order A, B and half to receive them in the order B, A. A criticism of this design is that effects of the first treatment may carry over into the period when the second is given. (Last, A Dictionary of Epidemiology, 2d ed)

Search BioPortfolio:
Loading