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| Web URL(s): | https://academic.oup.com/aob/article/39/4/745/116245
Last checked: 02/15/2017 |
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| Publication Type:
| Refereed |
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| Author(s): | Hunt, R. |
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| Author Affiliation: | Department of Botany, The University, Bristol, UG |
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| Title: | Further observations on root-shoot equilibria in perennial ryegrass (Lolium perenne L.) |
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| Source: | Annals of Botany. Vol. 39, No. 162, July 1975, p. 745-755. |
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| Publishing Information: | London, Oxford University Press |
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| Keywords: | TIC Keywords: Lolium perenne; Roots; Shoots; Potassium; Magnesium; Calcium
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| Abstract/Contents: | Plants of Lolium perenne L. (cv.S.23) were grown in a heated glasshouse. Two experiments were performed, both during early summer. One used a sand/solution rooting medium and included low-nitrogen (0.17 parts per 10(6)) and shade (20 .2 percent illumination) treatments; the other used aerates solution culture and involved two levels of shading (20.2 and 6.1 percent illumination), in addition to controls. In both experiments growth and rates of potassium, magnesium and calcium uptake were studied through the calculation of various growth-functions from fitted curves. Despite the effects of treatment and environment, a constant inverse relationship was found between the mass ratio of roots and shoots and their activity ratio. These new results were added to some previously published to form a conbined model: mass ratio=0.051 + 45.7(1/activity ratio) where activity ratio is expressed as specific absorbption rate for potassium (in ug K mg root-1 day-1)/unit shoot rate (rate of increase of whole-plant dry weight per unit shoot weight, mg mg-1 day-1). The implications of this relationship are discussed and a further model is put forward in which root activity is expressed in terms of the uptke of the sum of the potassium, magnesium and calcium contents of the plant. |
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| Language: | English |
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| References: | 17 |
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| Note: | Tables
Figures |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Hunt, R. 1975. Further observations on root-shoot equilibria in perennial ryegrass (Lolium perenne L.). Ann. Bot. 39(162):p. 745-755. |
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Last checked: 02/15/2017 |
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MSU catalog number: QK 1 .A53 |
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