Growth Response of Herbaceous Ornamentals to Phosphorus Fertilization

Henry, Josh B.; McCall, I.; Jackson, Brian E.; Whipker, Brian E.

doi:10.21273/hortsci12256-17

Cited by 14 publications

(23 citation statements)

References 7 publications

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“…If the deficiency conditions persist, necrotic areas may appear on the leaves [10]. With respect to P, it should be noted that the concentration of inorganic phosphate (Pi), the only form of P that can be absorbed by roots, is generally less than the amount needed for the optimal performance of crops [11][12][13]. This is mainly due to several properties of Pi, Figure 1.…”

Section: Fe and P Nutrition In Dicot Plantsmentioning

confidence: 99%

Similarities and Differences in the Acquisition of Fe and P by Dicot Plants

et al. 2018

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This review deals with two essential plant mineral nutrients, iron (Fe) and phosphorus (P); the acquisition of both has important environmental and economic implications. Both elements are abundant in soils but are scarcely available to plants. To prevent deficiency, dicot plants develop physiological and morphological responses in their roots to specifically acquire Fe or P. Hormones and signalling substances, like ethylene, auxin and nitric oxide (NO), are involved in the activation of nutrient-deficiency responses. The existence of common inducers suggests that they must act in conjunction with nutrient-specific signals in order to develop nutrient-specific deficiency responses. There is evidence suggesting that P-or Fe-related phloem signals could interact with ethylene and NO to confer specificity to the responses to Fe-or P-deficiency, avoiding their induction when ethylene and NO increase due to other nutrient deficiency or stress. The mechanisms responsible for such interaction are not clearly determined, and thus, the regulatory networks that allow or prevent cross talk between P and Fe deficiency responses remain obscure. Here, fragmented information is drawn together to provide a clearer overview of the mechanisms and molecular players involved in the regulation of the responses to Fe or P deficiency and their interactions.

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Section: Fe and P Nutrition In Dicot Plantsmentioning

confidence: 99%

Similarities and Differences in the Acquisition of Fe and P by Dicot Plants

et al. 2018

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“…After removal from the mist, all cuttings were fertilized with a solution consisting of 75 mgÁL -1 N, 5 mgÁL -1 P, and 75 mgÁL -1 potassium. This level of fertilizer was chosen from previous studies indicating that 5 mgÁL -1 P is the lowest that could be used without detrimental P deficiency symptoms (Henry et al, 2017(Henry et al, , 2018.…”

Section: Methodsmentioning

confidence: 99%

“…Fertilization treatments began the day of transplant for each cultivar. Five fertilizer concentrations of 0, 2.5, 5, 10, and 20 mgÁL -1 P were mixed using the previously described salts (Henry et al, 2017). Phosphorus concentrations were varied among treatments, whereas other essential nutrients were adjusted to remain as constant as possible.…”

Section: Methodsmentioning

confidence: 99%

“…Phosphorus concentrations were varied among treatments, whereas other essential nutrients were adjusted to remain as constant as possible. Nitrate-nitrogen and potassium were held at 150 mgÁL -1 , with all other essential microelements remaining constant (Henry et al, 2017). Fertilizer solutions were mixed in 100-L barrels and applied through drip irrigation as needed at every irrigation with an estimated 10% leaching fraction.…”

Section: Methodsmentioning

confidence: 99%

“…Specific recommendations suggest using 15N-2.2P-12.5K fertilizer mixed at a concentration of 175 to 225 mgÁL -1 N. This fertilization program would provide 25.7 to 33.0 mgÁL -1 P, which far exceeds the optimal concentrations of 5 to 15 mgÁL -1 P determined in previous studies (Henry et al, 2017(Henry et al, , 2018. Excessive P fertilization causes significant internode elongation in plants (Baas et al, 1995;Hansen and Nielsen, 2001;Henry et al, 2017Henry et al, , 2018Justice and Faust, 2015), and P runoff can have negative effects on the environment (Boesch et al, 2001;Majsztrik and Lea-Cox, 2013). Furthermore, excess soil P limits mycorrhizal colonization of roots (Mosse, 1973) and has an antagonistic effect on iron and manganese uptake, leading to nutrient deficiency symptoms (Mengel et al, 2001).…”

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confidence: 88%

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Restricted Phosphorus Fertilization Increases the Betacyanin Concentration and Red Foliage Coloration of Alternanthera

Henry¹,

Perkins‐Veazie²,

McCall³

et al. 2019

J. Amer. Soc. Hort. Sci.

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Phosphorus (P) deficiency commonly results in the development of red-to-purple coloration in plant foliage, typically attributed to anthocyanins. Betacyanins are a red pigment found in some plant species that do not produce anthocyanins, including Alternanthera sp. This study was conducted to investigate the effects of P nutrition on the betacyanin concentration and subsequent foliar coloration of ‘Purple Prince’, ‘Brazilian Red Hots’, and ‘Little Ruby’ alternanthera (Alternanthera brasiliana). The purpose of this study was to determine whether P fertilization management could enhance the coloration and aesthetic appeal of alternanthera. Custom fertilizers provided P concentrations of 0, 2.5, 5, 10, and 20 mg·L−1 P. One-half of the plants from each P concentration were restricted to 0 mg·L−1 P 1 month after transplant to determine whether adequate size could be attained before withholding P. Differences in P response were observed among cultivars for hue, betacyanin content, and plant size. Concentrations ≤5 mg·L−1 P resulted in plants that were more compact in terms of plant height and diameter, had deeper red foliage coloration, and greater foliar betacyanins compared with plants grown with greater P concentrations. Plants initially grown with 5 or 10 mg·L−1 P attained marketable size before P restriction and developed more red pigmentation compared with plants grown with P for the remaining duration of the study. Regression analysis demonstrated height was maximized with 3 to 8 mg·L−1 P, diameter with 4.1 to 8.4 mg·L−1 P, and branching with 10.0 mg·L−1 P. Foliar betacyanin concentrations were greatest in plants grown without P, reaching 269 mg/100 g fresh weight, whereas plants grown with 10 or 20 mg·L−1 P were 95% less (averaged ≈13 mg/100 g fresh weight). This study demonstrates that P restriction can benefit the aesthetic appeal of alternanthera and provides the first confirmation that P nutrition is associated with betacyanin accumulation.