Biological Effects of Brassinosteroids

Brosa, Carme

doi:10.1080/10409239991209345

Cited by 63 publications

(33 citation statements)

References 82 publications

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“…Brassinolide is the most bioactive form of the brassinosteroids (Bishop and Koncz 2002). While there is ample evidence that the modes of action of brassinosteroids and other plant hormones are different, brassinosteroids possess a broad spectrum of biological activities compared to the known plant hormones, including gibberellin-, auxin-, and cytokinin-like activities (Brosa 1999). In various bioassays, brassinolide has been shown to be 10-to 1,000-fold more active than, or synergistic with, auxins such as indole-3-acetic acid or NAA (Brosa 1999;Yopp et al 1981).…”

Section: Discussionmentioning

confidence: 98%

“…In angiosperm species, brassinosteroids have been shown to have several effects, including stimulating cell elongation, ethylene production, and adventitious tissue formation and increasing resistance to abiotic stress (Brosa 1999;Clouse 2001). Although little information is available for conifers, brassinosteroids have been isolated from conifers (Kim et al 1990) and exogenous applications of brassinosteroids to pine seedlings and spruce cuttings have shown improved root growth, whole plant growth, or both (Rajasekaran and Blake 1998;Ronsch et al 1993).…”

Section: Discussionmentioning

confidence: 99%

“…Over 60 kinds of brassinosteroids have been found to date (www.cidtech-research.com/brass.html). In angiosperm species, brassinosteroids have been shown to be present in seeds and to have diverse tissue-specific and speciesspecific effects on cell elongation, division and differentiation, reproductive biology, senescence, the stimulation of ethylene production, and an increase in resistance to abiotic stress (Brosa 1999;Clouse and Sasse 1998;Clouse 2001).…”

Section: Introductionmentioning

confidence: 99%

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Brassinolide improves embryogenic tissue initiation in conifers and rice

Pullman¹,

Zhang²,

Phan

2003

Plant Cell Reports

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Somatic embryogenesis (SE), the most promising technology for the large-scale production of high-value coniferous trees from advanced breeding and genetic engineering programs, is expected to play an important role in increasing productivity, sustainability, and the uniformity of future U.S. forests. To be successful for commercial use, SE technology must work with a variety of genetically diverse trees. Initiation in loblolly pine ( Pinus taeda L.), our main focus species, is often recalcitrant for desirable genotypes. Initiation percentages of loblolly pine, Douglas-fir [ Pseudotsuga menziesii (Mirb.) Franco], and Norway spruce ( Picea abies L., Karst.) were improved through the use of brassinolide. Brassinosteroids, which include brassinolide, are a relatively new group of natural plant growth regulators that are found in many plant species. They have been shown to have diverse, tissue-specific, and species-specific effects, including the stimulation of cell elongation and ethylene production and increasing resistance to abiotic stress. In our media, brassinolide was effective at concentrations ranging from 0.005-0.25 micro M. Using control medium (no brassinolide) and brassinolide-supplemented (0.1 micro M) medium, we achieved improved initiation percentages in loblolly pine, Douglas-fir, Norway spruce, and rice-15.0% to 30.1%, 16.1% to 36.3%, 34.6% to 47.4%, and 10%, respectively. Brassinolide increased the weight of loblolly pine embryogenic tissue by 66% and stimulated initiation in the more recalcitrant families of loblolly pine and Douglas-fir, thus compensating somewhat for genotypic differences in initiation. Initiation percentages in loblolly pine were improved through the combination of modified 1/2-P6 salts, 50 mg/l activated carbon (AC), adjusted levels of Cu and Zn (to compensate for adsorption by AC), 1.5% maltose, 2% myo-inositol (to raise the osmotic level, partially simulating the megagametophyte environment), 500 mg/l casamino acids, 450 mg/l glutamine, 2 mg/l alpha-naphthaleneacetic acid, 0.63 mg/l 6-benzylaminopurine, 0.61 mg/l kinetin, 3.4 mg/l silver nitrate, 10 micro M cGMP, 0.1 micro M brassinolide, and 2 g/l Gelrite. Across 12 open-pollinated families of loblolly pine, initiation percentages ranged from 2.5% to 50.7%, averaging 22.5%.

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Section: Discussionmentioning

confidence: 98%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Brassinolide improves embryogenic tissue initiation in conifers and rice

Pullman¹,

Zhang²,

Phan

2003

Plant Cell Reports

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“…Brassinosteroids are a novel group of steroids that appear to be ubiquitous in plants and essential for normal plant growth and development. They have exciting potential use in agriculture because of their ability to improve crop yield and quality, minimize enviromental stress and herbicidal injury and control pathogenic diseases (Brosa, 1997;Brosa et al, 1997).…”

mentioning

confidence: 99%

Antiviral Effect of Brassinosteroids against Herpes Virus and Arenaviruses

Wachsman¹,

López²,

Ramírez

et al. 2000

Antivir Chem Chemother

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“…The practical application of BRs is being done in Japan, where these hormones are used in large agricultural areas to improve the yield of crops such as wheat and rice (Brosa 1999). Brosa (1999) informed that BRs are natural, nontoxic products which are applied in extremely low doses and therefore suitable from the ecological and environmental points of view.…”

mentioning

confidence: 99%

Effects of brassinosteroids on prosperity of Scots pine seedlings

et al. 2014

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ABSTRACT:We tested the influence of exogenous application of brassinosteroids (BRs) on survival, growth and biomass production of Scots pine (Pinus sylvestris) seedlings. BRs are natural substances, supposedly having many positive effects on plants such as improving growth, stress tolerance, survival and biomass production. One part of the seedlings was treated with a low concentration of synthetically prepared BRs and the other part was designated as the control without any treatment. Mortality, height and root collar diameter were measured in two subsequent years, the root-to-shoot ratio of biomass volume was determined in autumn 2013. The application of BRs significantly slowed height and radial growth of pine. The height increment of the BRs-treated seedlings was lower by 11% between 2012 and 2013 compared to the control. The increment in root collar diameter (2012)(2013) in the BRs-treated seedlings was lower by 13% than in the control. The BRs-treated pines also experienced a significantly higher mortality compared to the control. No significant influence of BRs on biomass production was found.

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Biological Effects of Brassinosteroids

Cited by 63 publications

References 82 publications

Brassinolide improves embryogenic tissue initiation in conifers and rice

Brassinolide improves embryogenic tissue initiation in conifers and rice

Antiviral Effect of Brassinosteroids against Herpes Virus and Arenaviruses

Effects of brassinosteroids on prosperity of Scots pine seedlings

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