Phosphorus nutrition of tobacco seedlings grown in greenhouse float culture<sup>1</sup>

Rideout, James W.; Gooden, Dewitt T.

doi:10.1080/01904169809365405

Cited by 6 publications

(14 citation statements)

References 6 publications

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“…Tissue concentrations of B associated with symptoms of B deficiency vary among species. Rideout and Gooden (1997) investigated B uptake by tobacco seedlings in a float system and determined that transplant growth was acceptable at B concentrations in solution of 1-4 mg L -1 or lower. However, they also determined that early seedling growth was reduced at low B concentrations.…”

Section: Boron Nutrition In Crop Plantsmentioning

confidence: 99%

“…They concluded that the widely accepted belief of a narrow B threshold between deficiency and toxicity for all species is false. For tobacco transplant production, however, Rideout and Gooden (1997) have observed that tobacco seedlings exhibit a narrow range between B deficiency and toxicity.…”

Section: Boron Nutrition In Crop Plantsmentioning

confidence: 99%

“…Many burley tobacco growers believe that routine supplemental boron applications are required to grow good transplants. Earlier research with fluecured seedling production showed that this was not the case (Rideout and Gooden, 1997). Burley may respond differently.…”

Section: Introduction -Boron Deficiency Studymentioning

confidence: 96%

“…Current recommendations (Rideout and Shelton, 2001) suggest that the fertilizer contain at least 0.02 percent B. Lack of attention to micronutrient management creates a potential for B deficiencies in float systems, although in some instances trace contamination in fertilizer and water sources may provide sufficient B for acceptable plant growth (Rideout and Gooden, 1997;Abdulnour et al, 2000).…”

Section: Introduction -Boron Deficiency Studymentioning

confidence: 99%

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Boron Deficiency and Chilling Injury Interactions in Tobacco Transplants Grown in the Float System

et al. 2008

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OVERSTREET, LAURA FLINT. Boron Deficiency and Chilling Injury Interactions in Tobacco Transplants Grown in the Float System. (Under the direction of James W. Rideout.)Decades of agricultural research have failed to determine the precise mechanisms of infliction caused by the conditions of boron deficiency and chilling injury. Both conditions affect the quality and marketability of tobacco transplants grown in the float system. Interestingly, boron deficiency and chilling injury produce strikingly similar symptoms in young tobacco transplants; so similar, in fact, that they are often confused for one another. This has lead to severe boron toxicity when growers treated chilling injury as boron deficiency by applying boron to non-deficient float beds. The observation of nearly identical symptoms suggests that boron deficiency and chilling injury have interdependent effects on cell physiology and/or metabolism. Because little research has been conducted on tobacco transplants in the float system, two studies were conducted to determine general parameters for the boron deficiency threshold and effect of non-optimal temperatures and large day/night temperature differentials in this system. The boron deficiency study established that the deficiency threshold for transplants growing at 26/22º C is 10-20 µg B g -1 dry matter. These tissue levels occurred with solution concentrations of 0.19-1.9 µM B. The chilling injury study determined that root and shoot growth of flue-cured cultivars is near maximum at a constant 26/26º C temperature regime. Burley cultivars display a wider range of temperature tolerance, but in general constant day/night temperatures seem to provide the greatest shoot tissue accumulation.A reduction in night temperature resulted in decreased shoot growth in all cultivars. The chilling injury study also examined the effect of boron deficient conditions at each temperature treatment. In general, boron uptake declined at sub-optimal temperature regimes when supplied at concentrations sufficient for near-optimal temperatures. Shoot growth of flue-cured varieties at transplant stage was near maximal at a constant optimal day/night temperature regime (26/26º C) and adequate B concentrations. Sub-optimal temperatures may alter the boron deficiency threshold such that it decreases with decreasing temperatures or with stressful temperature differentials. This may be summarized in the following way: Temperature is the immediate limiting factor in tobacco transplant growth in the float system under conditions of sub-optimal temperatures and low B concentration, and B deficiency is an additional potential limiting factor.

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Section: Boron Nutrition In Crop Plantsmentioning

confidence: 99%

Section: Boron Nutrition In Crop Plantsmentioning

confidence: 99%

Section: Introduction -Boron Deficiency Studymentioning

confidence: 96%

Section: Introduction -Boron Deficiency Studymentioning

confidence: 99%

See 2 more Smart Citations

Boron Deficiency and Chilling Injury Interactions in Tobacco Transplants Grown in the Float System

et al. 2008

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“…Current recommendations (10) suggest that the fertilizer contain at least 0.02 percent B, a concentration not contained in all fertilizers utilized in float systems. In some instances, trace contamination levels of B in fertilizer and water sources may provide sufficient B for acceptable plant growth (1,9). Lack of attention to B fertilization creates the potential for B deficiencies in float systems.…”

Section: Introductionmentioning

confidence: 99%

Boron Deficiency and Chilling Injury Interactions in Tobacco Transplants Grown in the Float System

et al. 2003

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Boron deficiency and chilling injury produce similar symptoms in young tobacco transplants. Mistaken identification of chilling injury as B deficiency has resulted in B toxicity when growers apply additional B to non-deficient plants. In order to distinguish between B deficiency and chilling injury, it is important to determine an approximate B deficiency threshold and to determine the effects of suboptimal temperatures on growth and B uptake. In an experiment to determine tissue concentrations of B associated with B deficiency symptoms, transplants grown at a day/night temperature regime of 26/22ºC exhibited B deficiency symptoms at 10-20 µg B g-1 dry matter. These tissue levels resulted from solution concentrations of 0.19-1.9 µM B (0.002 to 0.205 mg L-1 B). Root and shoot growth of flue-cured cultivars was near maximum at a 26/26ºC day/night temperature regime. Burley cultivars were adapted to a wider temperature range for optimum growth compared to flue-cured cultivars. The B deficiency threshold decreased with decreasing temperatures and with increased day/night temperature differentials. Sub-optimal temperatures appeared to be the primary growth limiting factor for tobacco transplants in the float system with low B availability. Boron deficiency was a secondary factor in limiting growth.

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Metal contamination in urban street sediment in Pisa (Italy) can affect the production of antioxidant metabolites in Taraxacum officinale Weber

Bretzel

Benvenuti

Pistelli

2013

Environ Sci Pollut Res

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Taraxacum officinale Weber (dandelion) is a very ubiquitous species, and it can grow in urban environments on metal-polluted sediments deposited in the gutters. This study represents a preliminary step to verify the presence of metals in sediments collected in urban streets in Pisa and to assess the alteration in dandelion metabolites in order to understand its adaptation to polluted environments. The soil and sediments were collected at three urban streets and analyzed for total and extractable Cr, Pb, Cu, Ni, and Zn. The total values of Pb and Zn in street sediments exceeded the limits for residential areas of soils. Zn was the most mobile of the metals analyzed. Floating cultivations trials were set up with dandelion seedlings and street sediments. The metals were analyzed in roots and leaves. Antioxidant power, anthocyanins, polyphenols, non-protein thiols (NP-TH) and chlorophylls were measured in dandelion leaves. The first two parameters (anthocyanins and antioxidant power) were higher in the polluted samples compared to the control; chlorophyll content was lower in the treated samples, whereas NP-TH showed no differences. NP-TH groups determined in roots were associated with the root content of Zn and Pb. These results indicate that dandelion can tolerate plant stress by altering its metabolite content.

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Phosphorus nutrition of tobacco seedlings grown in greenhouse float culture¹

Cited by 6 publications

References 6 publications

Boron Deficiency and Chilling Injury Interactions in Tobacco Transplants Grown in the Float System

Boron Deficiency and Chilling Injury Interactions in Tobacco Transplants Grown in the Float System

Boron Deficiency and Chilling Injury Interactions in Tobacco Transplants Grown in the Float System

Metal contamination in urban street sediment in Pisa (Italy) can affect the production of antioxidant metabolites in Taraxacum officinale Weber

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Phosphorus nutrition of tobacco seedlings grown in greenhouse float culture1

Cited by 6 publications

References 6 publications

Boron Deficiency and Chilling Injury Interactions in Tobacco Transplants Grown in the Float System

Boron Deficiency and Chilling Injury Interactions in Tobacco Transplants Grown in the Float System

Boron Deficiency and Chilling Injury Interactions in Tobacco Transplants Grown in the Float System

Metal contamination in urban street sediment in Pisa (Italy) can affect the production of antioxidant metabolites in Taraxacum officinale Weber

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Product

Resources

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Phosphorus nutrition of tobacco seedlings grown in greenhouse float culture¹