Dry Matter Production and Partition in Relation to Yield of Tea

Magambo, M. J. S.; Cannell, M. G. R.

doi:10.1017/s0014479700011200

Cited by 39 publications

(36 citation statements)

References 5 publications

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“…We found that the woody tissue that forms the tea bush frame always had the highest DM irrespective of age and genotype-density combinations, which has also been reported by Dang (2005), Magambo and Cannel (1981), Ng'etich and Stephens (2001) and Wachira and Ng'etich (1999). Unlike in forests and tree plantations where foliage and fine root biomass decreases with age and maturity (Claus and George 2005), clear differences in foliage DM between genotypes/cultivars did exist in this study.…”

Section: Discussionsupporting

confidence: 85%

“…Management of the tea bush by periodical pruning and constant removal of the apical buds and breakingback to maintain the plucking table had been suggested as the main reason for the low DM. Indeed, Magambo and Cannel (1981) attributed the low standing DM of tea compared to forest trees and C 3 vegetative crops as due to the continual plucking that limits the amount of young photosynthetically active leaves as well as assimilate supply to other plant organs. Instead of standing biomass, the rate of DM increase per year would be a better indicator for the productivity of tea plantations.…”

Section: Discussionmentioning

confidence: 99%

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Carbon and nutrient stocks of tea plantations differing in age, genotype and plant population density

2008

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Tea (Camellia sinensis L.) is a perennial evergreen shrub managed intensively for continuous growth of young shoots. Most tea plantations were established at the expense of native forest. Change in carbon (C) and nutrient (nitrogen, phosphorus, potassium (NPK)) accumulation in forests over time has been intensively studied, but how C and NPK stocks in tea plantations are associated with age, genotype and plant density have not been reported yet in literature. To get a better insight in the effects of age and the associated change in genotype (clone or seedling) and density on C and NPK stocks data were collected in a chronosequence of tea plantations by destructive sampling of whole tea bushes. Four plantations differing in age (76-, 43-, 29-and 14-year old) and genotype-density combinations were selected. The 76-and 43-year old plantations were composed of seedlings planted at a relative low density: a spacing of 1.52 × 0.91 m and 1.22 × 1.22 m, respectively, whereas in the 29-and 14-year old plantations an improved clonal cultivar was grown at higher plant densities: a spacing of 1.22× 0.61 m and 1.22×0.76 m, respectively. Total dry matter weights (DM) of tea bushes increased with age from 9.0 to 11.5 kg in clonal bushes and from 13.5 and 19.9 kg in seedling bushes for the 14-and 29-year, and the 43-and 76-year old plantations, respectively. Most DM was stored in the woody tissue of the tea bush frame. Total C-stocks expressed per unit area (ha) amounted to 44 and 72, and 43 and 69 t C ha −1 for clonal and seedling bushes, respectively. Total N stocks ranged from 732 to 995 and from 734 to 1,200 kg ha −1 , P stocks from 78 to 120 and from 67 to 92 kg ha −1 , and K stocks from 775 to 901 and from 646 to 1,120 kg ha −1 for clonal and seedling bushes, respectively. It is concluded that older stands of seedling and clonal tea plantations result in higher C and NPK stocks. Higher stocks may be functional in maintaining yield stability under adverse weather conditions. Plantations with higher nutrient stocks are less responsive to nutrient supply and therefore will require lower fertilizer applications.

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Section: Discussionsupporting

confidence: 85%

Section: Discussionmentioning

confidence: 99%

Carbon and nutrient stocks of tea plantations differing in age, genotype and plant population density

2008

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“…Usually young shoots, a small portion of the tea plant,14 are harvested at regular intervals for processing teas. As a recommended practice, shoots with two leaves and a bud are harvested 15.…”

Section: Introductionmentioning

confidence: 99%

Expression of basic genes involved in tea polyphenol synthesis in relation to accumulation of catechins and total tea polyphenols

Mamati

Liang

2005

J Sci Food Agric

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Catechins, a group of polyphenolic compounds in the green leaf of tea [Camellia sinensis (L.) O. Kuntze], are major components conferring quality attributes and health benefits on processed tea. Expression patterns of the basic genes related to accumulation of the catechins and total polyphenols at different stages of tea leaf development and their relationship with catechin concentration were investigated by reverse transcriptase polymerase chain reaction and high-performance liquid chromatographic methods. The results showed that the concentration of total catechins and polyphenols in leaves at different stages of development declined with age of the leaf but changes of the individual catechins varied, with a general decrease in catechin gallate and epigallocatechin gallate and increase in epigallocatechin and epicatechin gallate. Genes of phenylalanine ammonium lyase (PAL), dihydroflavonol reductase (DFR) and three chalcone synthase genes (CHS1, CHS2, CHS3) were highly expressed in bud, first leaf and second leaf but were barely detected in mature leaves. The expression of DFR, a downstream gene in the catechin biosynthesis pathway, was closely related to the concentration of total catechins and polyphenols in various stages of leaf development.

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“…Previous research demonstrated wide response ranges among tea genotypes to different environments (Carr, 1997;Obaga et al, 1988;Tanton, 1982a;Wickremaratne, 1981;Carr and Stephens, 1992). Indeed, dry matter partitioning (Ng'etich and Stephenes, 2001a;Magambo and Canell, 1981;Magambo and Waithaka, 1983) and quality (Owuor et al, 2010b) of tea vary with clones and location of production. However, different clones have varying abilities to absorb nutrients from the soil (Yemane et al, 2008;Wanyoko, 1981) leading to clonal variation in mature leaf nutrient levels (Wanyoko and Njuguna, 1983).…”

Section: Resultsmentioning

confidence: 99%

Effect of Genotypes in Different Environments on Micronutrient Content of Black Tea

Omwoyo

Owuor²,

Ongeri³

et al. 2014

jtsr

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Essential elements are needed in the day to day living of both human beings and the plants including tea (Camellia sinensis). Different clones of tea have been developed and distributed to farmers in various locations however it remains obscure the levels of the essential elements in their resultant black teas. This study aimed at establishing the micronutrient levels of different clones planted in a single site and also establish whether the levels of the micronutrients varied in the same pattern when planted in different regions. It was found that the different clones varied significantly (p≤0.05) in their micronutrient levels when planted in a single location under similar agronomic practices and this did not follow a similar pattern when the clones were planted in different locations. Thus there is need to identify region specific clones in order to optimize the micronutrient content of resultant black teas.

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Dry Matter Production and Partition in Relation to Yield of Tea

Cited by 39 publications

References 5 publications

Carbon and nutrient stocks of tea plantations differing in age, genotype and plant population density

Carbon and nutrient stocks of tea plantations differing in age, genotype and plant population density

Expression of basic genes involved in tea polyphenol synthesis in relation to accumulation of catechins and total tea polyphenols

Effect of Genotypes in Different Environments on Micronutrient Content of Black Tea

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