Remobilization of Nitrogen from Vegetative Parts to Sprouting Shoots of Young Tea(Camellia sinensis L.) Plants.

Okano, Kunio; Komaki, Shinya; Matsuo, Kiyoshi

doi:10.1626/jcs.63.125

Cited by 16 publications

(9 citation statements)

References 7 publications

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“…On the other hand, it was also likely that the decreasing N concentrations in stem and roots were caused by N remobilization from these organs to support the rapid growth of the young shoots. The earlier experiment demonstrated that about 70% of N in the young shoots was contributed from remobilization from vegetative organs, which was absorbed before sprouting, while the remainder was newly absorbed during the extension process (Okano et al 1994).…”

Section: Urea-n Absorption By Leaves Of Tea Plants In the Solution Exmentioning

confidence: 99%

Absorption of foliar-applied urea-¹⁵N and the impact of low nitrogen, potassium, magnesium and sulfur nutritional status in tea (Camellia sinensisL.) plants

Ruan

Gerendás

2015

Soil Science and Plant Nutrition

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Section: Urea-n Absorption By Leaves Of Tea Plants In the Solution Exmentioning

confidence: 99%

Absorption of foliar-applied urea-¹⁵N and the impact of low nitrogen, potassium, magnesium and sulfur nutritional status in tea (Camellia sinensisL.) plants

Ruan

Gerendás

2015

Soil Science and Plant Nutrition

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“…It is a generally characteristic for perennial trees that the growth of spring young shoots is dependent upon remobilization of N storage within plants (Millard and Grelet, 2010). While the proportion of N for new shoot growth remobilized from storage is variable for a range of tree species having different leaf habits, it is estimated that for tea plants this proportion reaches 70% (Okano et al, 1994). N remobilization from leaves is very often accompanied by leaf senescence and degradation of leaf proteins and in particular chloroplast provides the enormous N source of utilization (Masclaux-Daubresse et al, 2010).…”

Section: Characterization Of Foliar 15 N Allocation From Mature Leavementioning

confidence: 99%

“…Okano et al. () reported that more than 70% N accumulated in new shoots was retranslocated from the vegetative parts. These results suggested that N remobilization played a crucial role in tea yield and quality, especially for the spring tea.…”

Section: Introductionmentioning

confidence: 99%

“…The dynamic of this storage N remobilization could cause the fluctuation of tea quality in spring season (Liu et al, 2016). Okano et al (1994) reported that more than 70% N accumulated in new shoots was retranslocated from the vegetative parts. These results suggested that N remobilization played a crucial role in tea yield and quality, especially for the spring tea.…”

Section: Introductionmentioning

confidence: 99%

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Dynamics of nitrogen translocation from mature leaves to new shoots and related gene expression during spring shoots development in tea plants (Camellia sinensis L.)

Fan

Zhang

Tang

et al. 2020

J. Plant Nutr. Soil Sci.

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The contribution of N remobilization is crucial for new shoots growth and quality formation during spring tea shoots development. However, the translocation mechanism of N from source leaves to sink young shoots is not well understood. In the present study, 15N urea was applied to mature tea leaves one week before bud break to track N remobilization in a field experiment. The dynamic changes in plant 15N abundance, contents of amino acids, and the expression levels of genes related to N metabolism and translocation were followed during the 18‐d development of new spring shoots until three expanding young leaves. The results showed that during the growth of new shoots the amount of 15N in the shoots increased, whereas the Ndff (N derived from 15N‐urea) in mature leaves decreased, showing that the foliar‐applied N in mature leaves was readily exported to new shoots. This process was found to be accompanied by decline of chlorophylls. In the mature leaves, expression CsATG18a and CsSAG12 involved in autophagy was dramatically induced (> 4‐fold) at approximately nine days after the bud breaking. The genes involved in the transformation of amino acids, including primarily CsGDH2, CsGDH4, CsGLT3, CsGS1;3, and CsASN2 were upregulated by > 3‐fold after bud breaking. The expression levels of CsATG8A, CsATG9, CsSAG12, CsGS1;1, CsGDH1, and CsAAP6 correlated negatively with the Ndff in mature leaves, but positively with 15N amount and total N amount in new shoots, suggesting these genes played important roles in N export from mature leaves. In the new shoots, the expression of most genes showed two defined peaks, one on six days and one on 12 days after bud breaking. The expression of CsGS2, CsASN3, CsGLT1, and CsAAP4 positively correlated with the 15N amount and total N amount in new shoots. These genes might be involved in the transport and re‐assimilation of N from mature leaves. The overall results demonstrated that the translocation of 15N from mature leaves to new spring shoots was regulated by the genes involved in autophagy, protein degradation, amino acid transformation and transport.

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“…The N supplied by soil can't always sustain the high N demand for next round new bud sprouting and leaves development, so N previously accumulated in the mature leaves is partly remobilized to support. Additionally, unlike annual crops, tea plant ceases vegetative growth and a portion of N remobilized from leaves and stems is allocated to the maintained canopy and underground roots in autumn and winter [10]. These are two contrasting patterns resulting N remobilization from sources to sinks.…”

Section: Introductionmentioning

confidence: 99%

Dynamic changes and genotypic variations of nitrogen concentration and remobilization for 20 tea plant (Camellia sinensis) cultivars throughout growing seasons

Zhang

et al. 2019

Preprint

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Background: Tea plant ( Camellia sinensis ) is an evergreen perennial plant and characterized by a high nitrogen (N) requirement. There are roundly bud sprouting and leaves development for plucking and pruning annually, leading to continuous and substantial amount of N removal. Appropriate level of N application is closely related with high yield and top quality, therefore understanding the underlying mechanism is very crucial for development of optimized tea garden management practices according to genotypes’ requirement. Results: This study aimed to assess variation for dynamic N concentration, N remobilization efficiency (NRE) and N utilization efficiency (NUtE) changes during growing seasons among 20 tea plant cultivars at sufficient N level. The average N concentration varied between 31.05 and 44.2 g kg -1 in one bud with two leaves, between 22.67 and 29.42 g kg -1 in leaves attached to green-red stems, between 20.79 and 24.57 g kg -1 respectively. The dynamic changes of N concentration represented different profiles of ‘S’, ‘U’ and ‘S-like’-shape respectively. Specific NRE defined here is dependent on the development rounds and accompanied with N fluxes between leaves compartments. Nevertheless, the rates and order of N remobilization were inconsistent among genotypes during the entire growing seasons, which might be affected by the amount of N requirement and managed at whole plant level. The dynamic changes of average NUtE among cultivars followed an ‘S’-shape. NUtE addressed here was special for harvestable part and lower NUtE is highly associated with tea quality. Conclusions: The result revealed the annual growing rhythm and physiological character related with N indices, which was related with the amount and optimal time for N fertilization requirement dependent on tea plant genotype. An optimized NUtE should be optimized by combination of tea garden management and breeding practices to achieve economic benefit, N use efficiency and sustainable development.

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Remobilization of Nitrogen from Vegetative Parts to Sprouting Shoots of Young Tea(Camellia sinensis L.) Plants.

Cited by 16 publications

References 7 publications

Absorption of foliar-applied urea-¹⁵N and the impact of low nitrogen, potassium, magnesium and sulfur nutritional status in tea (Camellia sinensisL.) plants

Absorption of foliar-applied urea-¹⁵N and the impact of low nitrogen, potassium, magnesium and sulfur nutritional status in tea (Camellia sinensisL.) plants

Dynamics of nitrogen translocation from mature leaves to new shoots and related gene expression during spring shoots development in tea plants (Camellia sinensis L.)

Dynamic changes and genotypic variations of nitrogen concentration and remobilization for 20 tea plant (Camellia sinensis) cultivars throughout growing seasons

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Remobilization of Nitrogen from Vegetative Parts to Sprouting Shoots of Young Tea(Camellia sinensis L.) Plants.

Cited by 16 publications

References 7 publications

Absorption of foliar-applied urea-15N and the impact of low nitrogen, potassium, magnesium and sulfur nutritional status in tea (Camellia sinensisL.) plants

Absorption of foliar-applied urea-15N and the impact of low nitrogen, potassium, magnesium and sulfur nutritional status in tea (Camellia sinensisL.) plants

Dynamics of nitrogen translocation from mature leaves to new shoots and related gene expression during spring shoots development in tea plants (Camellia sinensis L.)

Dynamic changes and genotypic variations of nitrogen concentration and remobilization for 20 tea plant (Camellia sinensis) cultivars throughout growing seasons

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Product

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Absorption of foliar-applied urea-¹⁵N and the impact of low nitrogen, potassium, magnesium and sulfur nutritional status in tea (Camellia sinensisL.) plants

Absorption of foliar-applied urea-¹⁵N and the impact of low nitrogen, potassium, magnesium and sulfur nutritional status in tea (Camellia sinensisL.) plants