Nutrient reserves in roots of fruit trees, in particular carbohydrates and nitrogen

Tromp, J.

doi:10.1007/978-94-009-6833-2_47

Cited by 94 publications

(69 citation statements)

References 23 publications

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“…Even so, maintaining nitrogen uptake and assimilation during the leafless period may increase nitrogen stocks. In trees, remobilized nutrient reserves are thought to be of primary importance for early spring growth, and roots are one of the main storage sites during the winter (Tromp 1983;Millard and Proe 1991;Millard 1996;Millard et al 1998). Nitrogen taken up during the leafless period would also increase nitrogen storage for spring growth if nitrate was available in the soil.…”

Section: Discussionmentioning

confidence: 99%

Winter nitrate uptake by the temperate deciduous treeQuercus serrata

Ueda

Mizumachi

Tokuchi

2010

Journal of Forest Research

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Winter nitrogen use in deciduous species is largely uncharacterized. We investigated nitrate uptake in the fine roots of a deciduous oak (Quercus serrata Thunb. ex. Murray). We conducted a 15 N-labeling experiment using saplings of Q. serrata in the winter. During three weeks of labeled nitrate application, the concentration of 15 N in the fine roots increased significantly. The amount of nitrogen absorbed, as nitrate, was 1.16 ± 1.02 mg N g DW -1 , equivalent to 7.6 ± 5.8% of the total nitrogen content. Our results indicate that Q. serrata saplings have significant potential for nitrate uptake in the fine roots in midwinter (i.e., in the absence of leaves). Although a significant amount of nitrogen applied as nitrate was accumulated, nitrate concentration in the fine roots remained low during the labeling period. Furthermore, significant nitrate reductase activity was detected. These data suggest that Q. serrata saplings can assimilate nitrate in the fine roots in midwinter.

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Section: Discussionmentioning

confidence: 99%

Winter nitrate uptake by the temperate deciduous treeQuercus serrata

Ueda

Mizumachi

Tokuchi

2010

Journal of Forest Research

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“…An anticipated defoliation reduces the amount of stored carbohydrates, with consequences on productivity and tree growth the following year (Loescher et al 1990;Tromp 1983). In the current study, mite feeding was not suYcient to cause defoliation in peach trees, but it reduced the amount of reserves for growth in the following season.…”

Section: Discussionmentioning

confidence: 99%

“…Depletion of reserves in woody plants may aVect sprouting in the next growing season (Loescher et al 1990). Level of carbohydrate reserves can be aVected by light intensity, temperature, defoliation, pruning (Tromp 1983), and by herbivore activity (Welter 1989). Spider mites (Tetranychidae) feeding causes mechanical injury to leaves, which results in a wide range of morphological and physiological plant responses, including changes in photosynthetic activity.…”

Section: Introductionmentioning

confidence: 99%

The population level of Eotetranychus lewisi and the concentration of carbohydrates in peach trees

et al. 2007

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Lewis spider mite Eotetranychus lewisi (McGregor) is the most important pest in peach orchards, Prunus persica (L.) (Batsch), in North-Central Mexico. In autumn 2003 and spring 2004, two glasshouse experiments were carried out to assess the influence of that mite on the concentration of total soluble sugars and starch in leaves, bark and roots of 'diamante mejorado' peach trees. Apical leaves of peach trees were inoculated with three mite densities per leaf: (A) 10-20, (B) 21-40, (C) 41-80; a mite-free control was added. In 2003, at 81 days after infestation (DAI), cumulative mite-days per leaf (CMD) were 153, 1313, 2844 and 4771 in control and treatments (A), (B) and (C), respectively. In the same order, these CMD caused reductions in total soluble sugars (TSS): in leaves, 45, 50 and 61%; in bark, 9, 20 and 33%; in roots, 8, 20 and 26%. Reductions of starch concentration in leaves were 17, 43 and 56%; in bark, 25, 55 and 32%; in roots, 17, 22 and 32%. In 2004, at 77 DAI and 57, 1043, 2426 and 3996 CMD for control and treatments (A), (B) and (C), respectively, resulting reductions of TSS were: in leaves, 3, 7 and 15%; in bark, 0.8, 3 and 5%; in roots, 57, 60 and 78%, whereas reductions in starch concentration were: in leaves, 30, 34 and 44%; in bark, 18, 24 and 41%; in roots, 17, 47 and 48%. The higher reductions in roots found in 2004 are attributed to cumulative injury affecting food reserves.

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“…Hohe N-Reserven in den Pflanzen können ein mangelndes N-Angebot des Bodens im Frühjahr und ein hohes N-Angebot mangelnde N-Reserven nicht ersetzen (Tromp 1983;Faby 1984;Faby u. Naumann 1986a,b).…”

Section: Influence Of Organic N Fertilization On Yield Of Ornamental unclassified

Einfluss organischer N-Dünger und Höhe der N-Düngung auf den Ertrag von Ziersträuchern (Cornus sanguinea) in der Baumschule

Schacht¹,

Dierend²,

Fründ³

et al. 2006

Erwerbs-Obstbau

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Nutrient reserves in roots of fruit trees, in particular carbohydrates and nitrogen

Cited by 94 publications

References 23 publications

Winter nitrate uptake by the temperate deciduous treeQuercus serrata

Winter nitrate uptake by the temperate deciduous treeQuercus serrata

The population level of Eotetranychus lewisi and the concentration of carbohydrates in peach trees

Einfluss organischer N-Dünger und Höhe der N-Düngung auf den Ertrag von Ziersträuchern (Cornus sanguinea) in der Baumschule

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