Weekly Absorption of Nitrate by Young, Bearing Orange Trees Growing Out of Doors in Solution Cultures

Chapman, H. D.; Parker, E. R.

doi:10.1104/pp.17.3.366

Cited by 34 publications

(19 citation statements)

References 2 publications

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“…In Clementine mandarin, rind colour development increased when soil temperature reaches 20-23 • C, suggesting this interval as the threshold for fruit colouration . This requirement of low soil temperature for colour development might be connected with the reduction of the colour-retardant hormones gibberellins and cytokinins on the roots and hence for fruit supply (Eilati et al, 1969) and with a reduced rate of nitrogen absorption (Chapman and Parker, 1942) and transport (Wallace, 1953) from the roots to the canopy.…”

Section: Temperaturementioning

confidence: 99%

Biochemical bases and molecular regulation of pigmentation in the peel of Citrus fruit

Rodrigo

Alquézar

Alós

et al. 2013

Scientia Horticulturae

162

113

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Section: Temperaturementioning

confidence: 99%

Biochemical bases and molecular regulation of pigmentation in the peel of Citrus fruit

Rodrigo

Alquézar

Alós

et al. 2013

Scientia Horticulturae

162

113

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“…The popular approach also ignores a number of observations made during the past 30 years, which indicate not only that unsuberized roots often are lacking or few in number on trees in the winter and during droughts, but also that suberized roots can function in water and salt absorption. Among these are observations by Crider (1933), Nightingale (1935) MacDougal (1937), Chapman and Parker (1942) ' Hayward, Blair and Skaling (1942), Addoms (1946), and Kramer (1946).…”

Section: Introductionmentioning

confidence: 93%

Seasonal Variations in the Proportions of Suberized and Unsuberized Roots of Trees in Relation to the Absorption of Water

Kramer

Bullock

1966

American Journal of Botany

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“…Cool temperatures have been reported to reduce markedly nitrogen uptake (3,20) and translocation (20) by citrus trees, 'College of Agriculture Publication No. 3856. and the pericarp of C. paradisi Macf.…”

mentioning

confidence: 99%

Sugar Regulation of Plastid Interconversions in Epicarp of Citrus Fruit

Huff¹

1984

Plant Physiol.

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In a previous paper (9) it was demonstrated that transformation between chloroplasts and chromoplasts in citrus epicarp could be controlled in vitro by manipulating sugar and nitrogen supplies in agar media upon which pericarp segments were cultured. High concentrations of sucrose in media usually promoted degreening and inhibited regreening, whereas nitrogen as nitrate and certain amino acids acted in opposition to sucrose by inhibiting degreening and promoting regreening. In the presence ofincreasing nitrogen concentrations, the sucrose effect was much reduced and, when nitrogen supplies were sufficiently high, high concentrations of sucrose sometimes promoted regreening.In addition to promoting loss ofChl, high sugar concentrations in media increased epicarp sugar concentrations, and in media lacking nitrogen high concentrations of sugars caused a marked reduction in epicarp amino acid concentrations. In those in vitro experiments there was a significant negative correlation between Chl and the molar ratio of sugars to amino acids in the epicarp.Based on these observations, it is hypothesized that most citrus fruit degreen in response to a reduced flux in nitrogen to the fruit accompanied by increased concentrations of sugars in the epicarp, both usually induced by cool temperatures. Regreening of late season citrus fruit in the spring and summer could be attributed to renewed nitrogen flux and a reduction in sugar concentrations. Degreening of species such as C. madurensis Lour., could also be attributed to elevated sugar concentrations and reduced nitrogen content, but cool temperatures would not be the causative factor.To further examine the relationship between plastid transformations and sugar and nitrogen status, Chl, sucrose, reducing sugars, total nitrogen, and amino acids were monitored in the epicarp of C. sinensis (L.), Osbeck cv Valencia and pericarp of C. madurensis Lour. fruit degreening in situ, and in the epicarp of regreening C. sinensis fruit. Also, pericarp sections from C. sinensis fruit at different stages of development were tested for their response to sugars and nitrate in vitro. The results, reported here, suggest that accumulation ofsugars in the epicarp is indeed a major factor regulating plastid metamorphosis in citrus fruit, and that while the abundance of nitrogen is an influential factor, nitrogen flux is not a major factor in seasonal changes in plastid form. MATERIALS

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Weekly Absorption of Nitrate by Young, Bearing Orange Trees Growing Out of Doors in Solution Cultures

Cited by 34 publications

References 2 publications

Biochemical bases and molecular regulation of pigmentation in the peel of Citrus fruit

Biochemical bases and molecular regulation of pigmentation in the peel of Citrus fruit

Seasonal Variations in the Proportions of Suberized and Unsuberized Roots of Trees in Relation to the Absorption of Water

Sugar Regulation of Plastid Interconversions in Epicarp of Citrus Fruit

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