The Effect of Photoperiod Duration Upon the Respiratory Activity of the Roots of Wheat Seedlings

Neales, T. F.; Davies, J. A.

doi:10.1071/bi9660471

Cited by 30 publications

(10 citation statements)

References 19 publications

(25 reference statements)

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“…For Lolium multiforum, Hansen (12) reported two peaks of nitrate uptake in phase with two diurnal peaks of root respiration. Supporting this finding, diurnal oscillations in root respiration following a dual peak pattern have been reported by several authors (8,11,14,16,18) and may account for the two peaks of nutrient uptake that we and others have observed (12,19). According to the findings of Pan et at (19) the existence of a night peak of uptake is a genotypic property of the cultivar tested.…”

Section: Discussionsupporting

confidence: 80%

Diurnal uptake of nitrate and potassium during the vegetative growth of tomato plants

Bot

Kirkby

1992

Journal of Plant Nutrition

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Tomato plants (Lycopersicon esculentum Mill.) of the F 1 hybrid variety Turbo were grown in a NFT system for 22 days. On days 16 and 20-22 inclusive of the experiment, the diurnal variation in nitrate (NO 3 ), potassium (K), and water uptake rates were measured. Nitrate and K uptake rates were subject to large diurnal variation with maximum uptake rates occurring during the day period. Two peaks of diurnal uptake rates were identified, one large peak during the day period and a second much smaller one during the first 2-4 hours of the night. Under the conditions of the experiment, night nutrition made up 35 to 40% of the total daily uptake of K and NO 3 . Water uptake rates followed a diurnal oscillation with a single peak pattern. Highest rates occurred at the middle of the photoperiod and lowest rates were measured at night. Over the entire day and night cycle there was no correlation between the rates of water and nutrient uptake. This may be of importance in the fertilization of hydroponically grown plants since in horticultural practice nutrients and water are supplied together in quantities large enough to meet plant water demand but not nutrient requirements. INTRODUCTIONCurrent knowledge of diurnal variation in nutrient uptake by plants is still very sketchy. Studies on diurnal uptake of K and NO3 have been made on monocotyledons (3,6,12,15,16,19) but are rare for dicotyledons in particular for tomato. Several authors have described a simple pattern of NO3 and K uptake with highest uptake rates reached during the day period followed by a constant decline 1. Present address: INRA, Station d'Agronomie, DomaineSaint-Paul, 84140 Montfavet FRANCE.

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Section: Discussionsupporting

confidence: 80%

Diurnal uptake of nitrate and potassium during the vegetative growth of tomato plants

Bot

Kirkby

1992

Journal of Plant Nutrition

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“…tggg; Desjardins 1992) lower during 52 but were still statistically significant (P < 0.05). Correlations found between R6 and P and P-1 obtained in this study are in agreement with laboratory experimenis on the effect ofleafphotosynthesis on root respiration (Neales and Davies 1966;Osman 1971), showing that these effects can be measured under field conditions. The closer relationship found in 51 and 52 corroborates the observation by Keith et al (1986) and Liljeroth et al (1990) For personal use only.…”

Section: Photosynthesissupporting

confidence: 76%

Soil respiration in barley (Hordeum vulgare L.) and fallow fields

Rochette¹,

Desjardins²,

Gregorich³

et al. 1992

Can. J. Soil. Sci.

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A study was carried out to quantify the diurnal variation of soil respiration in fallow and barley fields and to assess the impact of atmospheric CO2 concentration (C) and crop photosynthesis on soil respiration rates under field conditions. Soil respiration rate was measured twice a day (06:00 and 13:00 h EST) for 69 consecutive days at Ottawa, Ontario, Canada, during the 1990 growing season. Measurements were taken on fallow and under a barley (Hordeum vulgare L. ’Léger’) crop using a dynamic closed chamber system. Crop net photosynthesis was obtained by substracting soil respiration from the vertical CO2 fluxes above the crop which was obtained using the eddy correlation technique. Afternoon soil respiration averaged 22 and 17% more than that in the morning on fallow and barley soils, respectively. No correlation was found between atmospheric CO2 concentration and morning respiration rates. The two daily respiration measurements on fallow soil could be fit to the same function of soil temperature despite important differences in C at the time of measurement. These results indicate that soil temperature might account for the differences in R between morning and afternoon, and that the effect of C need not be considered for the modelling of the soil respiration diurnal cycle. Respiration in soil under barley was 25% lower than in fallow soil. Soil under barley was estimated to have at least 199 g C m−2 more than fallow soil at the time of harvest due to the lower soil respiration and to the input of carbon by barley root residues. High correlations were obtained between crop photosynthesis and soil respiration rates during vegetative and reproductive periods, confirming that the biotic plant component is an important factor controlling soil respiration rates in cropped fields. Key words: Root respiration, chamber measurements, CO2 flux, crop net photosynthesis, greenhouse gas, soil organic matter.

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“…A similar adaptation of dark respiration of lucerne roots is suggested by the close relation found by Thomas and Hill (1949) between the rate of root respiration one day and the rate of net photosynthesis by lucerne communities on the preceding days. Root respiration in wheat seedlings has also been found to rise during each daily light period, and to fall during dark periods (Neales and Davies 1966).…”

Section: Discussion (A) Relation Between Respiration Photosynthementioning

confidence: 99%

Photosynthesis in Artificial Communities of Wheat, Lucerne, and Subterranean Clover Plants

King¹,

Evans²

1967

Aust. Jnl. Of Bio. Sci.

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SummaryThe relation between leaf area index (L.A.I.) and rates of net photosynthesis at three light intensities, and of dark respiration, was examined throughout the course of growth of artificial communities of wheat and lucerne at 20°C, and of subterranean clover at 25° /20°C.For all three species, net photosynthesis rose rapidly with increase in L.A.I. to values of 3-4, and with wheat and lucerne continued to rise, slowly, up to the highest L.A.I. values attained, above lO. With the subterranean clover communities there was a slight fall in net photosynthesis at the highest L.A.I. reached, 5. At a light intensity of 3300 foot candles, the highest rates of net photosynthesis were 48· 5, 44· 5, and 31· 5 mg CO 2/dm 2 ground surface/hr for wheat, lucerne, and subterranean clover respectively.Dark respiration increased asymptotically with increase in L.A.I. of the communities. With wheat and lucerne, leaf respiration rate fell progressively with depth in the community. The highest respiration rates reached were 14· 5, 21· 5, and 16· 5 mg C02/dm2 ground surface/hr for the wheat, lucerne, and subterranean clover communities respectively.Gross photosynthesis accounted for 12· 8, 13· 5, and 9· 8% of the visible light absorbed by the wheat, lucerne, and clover communities respectively. Their highest crop growth rates were 30 g/m2/day for wheat, 39 g/m2/day for lucerne (excluding root growth), and 20 g/m2/day for subterranean clover.The dependence of transpiration rate of the plant communities on their L.A.I. and the energy balance of the communities within the artificially lit cabinets are also considered.

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The Effect of Photoperiod Duration Upon the Respiratory Activity of the Roots of Wheat Seedlings

Cited by 30 publications

References 19 publications

Diurnal uptake of nitrate and potassium during the vegetative growth of tomato plants

Diurnal uptake of nitrate and potassium during the vegetative growth of tomato plants

Soil respiration in barley (Hordeum vulgare L.) and fallow fields

Photosynthesis in Artificial Communities of Wheat, Lucerne, and Subterranean Clover Plants

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