Uptake, transport and assimilation of15N-nitrate and15N-ammonium in tea (Camellia sinensisL.) plants

Morita, Akio; Ohta, M.; Yoneyama, T.

doi:10.1080/00380768.1998.10414488

Cited by 29 publications

(16 citation statements)

References 8 publications

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“…Nitrogen reduced from nitrate was detected in these three parts in a previous Downloaded by [Stony Brook University] at 03:10 20 October 2014 study (Morita et al 1999a). During nitrate reduction, oxalate is synthesized to neutralize OH-produced through nitrate reduction (Raven and Smith 1976).…”

Section: Discussionmentioning

confidence: 87%

“…High nitrate content was observed only in fibrous roots. Morita et al (1999a) reported that the transport of nitrate from roots to shoots in the tea plant was suppressed, though the mechanism of this suppression has not been elucidated. The transport of nitrate from roots to shoots might be a key process of the nitrate assimilation in tea plants.…”

Section: Discussionmentioning

confidence: 95%

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Nitrate and oxalate contents of tea plants (Camellia sinensisL.) with special reference to types of green tea and effect of shading

Morita

Tuji²

2002

Soil Science and Plant Nutrition

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Section: Discussionmentioning

confidence: 87%

Section: Discussionmentioning

confidence: 95%

Nitrate and oxalate contents of tea plants (Camellia sinensisL.) with special reference to types of green tea and effect of shading

Morita

Tuji²

2002

Soil Science and Plant Nutrition

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“…hydroculture (Morita et al 1998). And the significant difference between the gross nitrification and microbial consumption in HTP soil (Fig.…”

Section: Figurementioning

confidence: 94%

“…Tea is a leaf harvested crop and preferentially takes up NH þ 4 rather than NO À 3 when both N forms are available in soils (Morita et al 1998;Yang 2005). Nitrogen fertilizers can improve both the yield and quality of tea, especially green tea.…”

Section: Introductionmentioning

confidence: 99%

Net and gross nitrification in tea soils of varying productivity and their adjacent forest and vegetable soils

Wang

et al. 2012

Soil Science and Plant Nutrition

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Tea (Camellia sinensis (L.) O. Kuntze) is a globally important crop and is unusual because it both requires and acidifies the soil in which it grows. In spite of the low pH, high nitrate (NO À 3 ) accumulates in tea soils, resulting in a great potential for diffuse pollution. Nitrification in tea soils remains poorly understood. The purpose of this study was to investigate net and gross nitrification in three tea soils with varying productivity, their adjacent forest and vegetable soils. The results showed that neither net nor gross nitrification rates were significantly related to soil pH. The net nitrification rate increased with increasing tea production, and when soils were incubated with ammonium sulfate. The ammonium (NH þ 4 ) added to the vegetable soil was immediately and completely nitrified, but that in the tea and forest soils was nitrified more slowly. About 60-80% of the NH þ 4 in the tea and forest soils was nitrified during 35 d of incubation, indicating nitrifiers do exist in these soils. Significantly higher gross nitrification rates were observed in vegetable and tea soils with high and medium production than in forest and tea soils with low production. Microbial consumption (immobilization and nitrate respiration) accounted for 30 to 70% of the mineralized nitrate nitrogen (NO À 3 ÀN) with the lowest in the forest soil, and no significant difference between the tea and vegetable soils. Nitrogen fertilizer stimulated soil nitrification. In conclusion, the types of land use and their management are more important than soil pH for soil nitrification. High nitrogen application rate is the main cause of NO À 3 accumulation in tea soils and should be reduced to minimize NO À 3 pollution of water resources.

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“…Although most plants have developed mechanisms to use both, these ions have different effects on physiological processes, depending on species and growth conditions. When both NH + 4 and NO − 3 are supplied together, NH + 4 is usually absorbed in greater amounts than NO − 3 (Chaillou et al, 1994;Morita et al, 1998). Conversely, most authors have found that NH + 4 inhibits NO − 3 uptake (Haynes and Goh, 1978;Kronzucker et al, 1999).…”

Section: Introductionmentioning

confidence: 91%

Effects of Nitrogen Source on Growth and Development of Strawberry Plants

Cárdenas‐Navarro

López-Pérez

Lobit

et al. 2006

Journal of Plant Nutrition

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An experiment was conducted to study the effects of nitrate (NO − 3 ) and ammonium (NH + 4 ) ratios in nutrient solutions on the growth and production of fruits, runners, and daughter plants of strawberry Fragaria x ananassa Duch., grown in a hydroponic system. Five treatments were applied, consisting of different proportions of NH + 4 and NO − 3 in the nutrient solution. The NH + 4 :NO − 3 ratios were: T0 = 0:4, T1 = 1:3, T2 = 2:2, T3 = 3:1, and T4 = 4:0, at a constant nitrogen (N) concentration of 4 mol m −3 . Growth and morphogenesis were characterized by monitoring leaf-area increase, number of flowers and fruits per plant, and number of daughter plants of first and second generations. Nitrogen and carbon (C) content were measured at the end of the experiment in the organs of both mother and daughter plants. None of the variables related to the growth of the mother plant was affected by the treatments. However, the number of fruits increased with the proportion of NH + 4 in the nutrient solution. The number of daughter plants produced was affected only at high NH + 4 proportions, and their size (dry matter per daughter plant) and fertility (number of second-generation plants per first-generation plants) were reduced. The N or C content of the plants was not significantly affected by the treatments, but the C/N ratio in the crowns of mother plants was higher in treatments with 25% and 50% NH + 4 in the nutrient solution.

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Uptake, transport and assimilation of¹⁵N-nitrate and¹⁵N-ammonium in tea (Camellia sinensisL.) plants

Cited by 29 publications

References 8 publications

Nitrate and oxalate contents of tea plants (Camellia sinensisL.) with special reference to types of green tea and effect of shading

Nitrate and oxalate contents of tea plants (Camellia sinensisL.) with special reference to types of green tea and effect of shading

Net and gross nitrification in tea soils of varying productivity and their adjacent forest and vegetable soils

Effects of Nitrogen Source on Growth and Development of Strawberry Plants

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