Temperature Dependence of the Concentration Kinetics of Absorption of Phosphate and Potassium in Corn Roots

Bravo-F, Pedro; Uribe, Ernest G.

doi:10.1104/pp.67.4.815

Cited by 82 publications

(46 citation statements)

References 14 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Maize shoot demand for nutrients seemed to control N, and K uptake and translocation, but not P at low solution temperatures (Engels et al 1992). Moreover, P uptake was usually more suppressed by low soil temperatures than the uptake of other nutrients (Bravo-F and Uribe 1981). The effect of temperature on nutrient uptake is difficult to generalize because these effects vary with different physiological processes and plant organs.…”

Section: Introductionmentioning

confidence: 92%

Effects of root-zone temperature and N, P, and K supplies on nutrient uptake of cucumber (Cucumis sativusL.) seedlings in hydroponics

Yan

Duan

Mao

et al. 2012

Soil Science and Plant Nutrition

View full text Add to dashboard Cite

The nutrient uptake and allocation of cucumber (Cucumis sativus L.) seedlings at different root-zone temperatures (RZT) and different concentrations of nitrogen (N), phosphorus (P), and potassium (K) nutrients were examined. Plants were grown in a nutrient solution for 30 d at two root-zone temperatures (a diurnally Fuctuating ambient 10 C-RZT and a constant 20 C-RZT) with the aerial parts of the plants maintained at ambient temperature (10 C-30 C). Based on a Hoagland nutrient solution, seven N, P, and K nutrient concentrations were supplied to the plants at each RZT. Results showed that total plant and shoot dry weights under each nutrient treatment were significantly lower at low root-zone temperature (10 C-RZT) than at elevated root-zone temperature (20 C-RZT). But higher root dry weights were obtained at 10 C-RZT than those at 20 C-RZT. Total plant dry weights at both 10 C-RZT and 20 C-RZT were increased with increased solution N concentration, but showed different responses under P and K treatments. All estimated nutrient concentrations (N, P, and K) and uptake by the plant were obviously influenced by RZT. Low root temperature (10 C-RZT) caused a remarkable reduction in total N, P, and K uptake of shoots in all nutrient treatments, and more nutrients were accumulated in roots at 10 C-RZT than those at 20 C-RZT. N, P, and K uptakes and distribution ratios in shoots were both improved at elevated root-zone temperature (20 C-RZT). N supplies were favorable to P and K uptake at both 10 C-RZT and 20 C-RZT, with no significantly positive correlation between N and P, or N and K uptake. In conclusion, higher RZT was more beneficial to increase of plant biomass and mineral nutrient absorption than was increase of nutrient concentration. Among the three element nutrients, increasing N nutrient concentration in solution promoted better tolerance to low RZT in cucumber seedlings than increasing P and K. In addition, appropriately decreased P concentration favors plant growth.

show abstract

Section: Introductionmentioning

confidence: 92%

Effects of root-zone temperature and N, P, and K supplies on nutrient uptake of cucumber (Cucumis sativusL.) seedlings in hydroponics

Yan

Duan

Mao

et al. 2012

Soil Science and Plant Nutrition

View full text Add to dashboard Cite

show abstract

“…Much of the evidence for this proposed mechanism has come from observing a sharp break in the Arrhenius plots of uptake versus the inverse of root temperature (Clarkson & Warner, 1979 ;Markhart et al, 1979 ;Bravo-F. & Uribe, 1981). In fact, on the basis of such an approach critical temperatures have been proposed for different ionic species.…”

Section: Responses To Soil Temperaturementioning

confidence: 99%

Kinetics of nutrient uptake by roots: responses to global change

2000

View full text Add to dashboard Cite

There is a growing recognition that accurate predictions of plant and ecosystem responses to global change require a better understanding of the mechanisms that control acquisition of growth-limiting resources. One such key mechanism is root physiological capacity to acquire nutrients. Changes in kinetics of root nitrogen (N) uptake might influence the extent to which terrestrial ecosystems will be able to sequester excesses in carbon (C) and N loads. Despite its significant role in determining plant and ecosystem cycling of C and N, there is little information on whether, or how, root nutrient uptake responds to global change. In this review various components of global change, namely increased CO # concentration, increased soil temperature and increased atmospheric N deposition and their effects on kinetics of root nutrient uptake are examined. The response of root nutrient uptake kinetics to high CO # is highly variable. Most of this variability might be attributable to differences in experimental protocols, but more recent evidence suggests that kinetic responses to high CO # are also species-specific. This raises the possibility that elevated CO # might alter community composition by shifting the competitive interaction of co-occurring species. Uptake of NH % + and NO $ − seem to be differentially sensitive to high CO # , which could influence ecosystem trajectory toward N saturation. Increased soil temperature might increase N and P uptake capacity to a greater extent in species from warm and fluctuating soil habitats than in species from cold and stable soil environments. The few available data also indicate that increased soil temperature elicits a differential effect on uptake of NH % + versus NO $ − . Root uptake kinetics are generally down-regulated in response to long-term exposure to atmospheric N deposition. The extent of this down-regulation might, however, vary among species, stages of succession, land-use history and plant demand. Nonetheless, it is suggested that root N uptake kinetics might be an accurate biological indicator of the ecosystem capacity to retain N. The results reviewed here clearly highlight the scanty nature of the literature in the area of root nutrient absorption responses to global change. It is also clear that effects of one component of global change on root nutrient absorption capacity might be counterbalanced by another. Therefore, the generalizations offered here must be viewed with caution and more effort should be directed to rigorously test these initial observations in future research.

show abstract

“…The rate of repolarization as APD/degree .0.5 min may be calculated from the linear portion of the repolarization time course of Figure 7. The respirationtemperature relationship is again from Figure 1 of the accompanying paper (3). The numbers in parentheses indicate the Ea in kcal/mole of the respective processes, calculated from the slope of the straight segments of the plots (23).…”

mentioning

confidence: 99%

An Analysis of the Relationship between Respiration and the Transmembrane Potential in Corn Roots

Bravo-F

Uribe²

1981

Plant Physiol.

Self Cite

View full text Add to dashboard Cite

The effects of cyanide, anoxia, and temperatures varying from 2 to 42 C on the cell membrane electropotential difference (PD) of washed and freshly excised corn roots have been determined. Respiration rates of freshly excised root segments in response to cyanide and to varying temperatures were also measured. The ceDl membrane PD of roots which had been washed for 12 to 15 hours was almost insensitive to cyanide and anoxia but sensitive to low temperature. In contrast, the cell membrane PD of freshly excised roots was reversibly depolarized by all three treatments, cyanide depolarized from -117 to -86 milivolts and the sequential imposition of anoxia further lowered the PD to -69 milivolts. Anoxia applied first depolarized maximaDy and the PD was not further lowered by sequential cyanide treatment. Arrhenius plot analysis of the temperature response of respiration showed an apparent transition at 13 C with an activation energy of 20.0 kilocalories per mole below and 8.8 kilocalories per mole above the transition temperatures. The energy of activation for repolarization of PD is much higher, 53.4 kilocalories per mole below 7 to 8 C and 25.4 kilocalories per mole above this apparent transition. The energy requirement for polarization of the ceOl membrane PD was calculated based on the temperature responses of the ceOl membrane PD and respiration. It was estimated that 3.5% of the energy output from respiration at 22 C is required for cell polarization. It is unlikely that ion transport is limited by energy availability below the 8C transition in this chili sensitive species.Cells of higher plants typically maintain a cell PD4 of about 100 mv, interior negative. This cell PD has been shown to have two components in corn roots and in other higher plants (1,6,7,9). One of the components is of a diffusive nature and contributes about one-half of the total potential (12). The other component, generated by the activity ofelectrogenic ion pumps, can be blocked by treating the tissue with inhibitors of mitochondrial electron transport such as cyanide (7, 17), carbon monoxide (1), azide (20), uncouplers such as fluorocarbonyl cyanide phenylhydrazone (6) and DNP (7,12). Anoxia (10), and low temperatures (8,20) that the cell PD in washed pea and oat stem tissue is sensitive to CN-. Preliminary studies on the relationship of PD to respiratory activity in corn indicated that PD in this species is not affected by CN-when roots are washed by the protocol used for oats and peas by Higinbotham et al (12). A portion of this study examines the effects of CN-, anoxia, and low temperature on washed and freshly excised corn roots. The restriction of respiration by low temperature in chill sensitive species has been amply documented (2,4,5,19). The reduction of respiratory function has been correlated with reduced ion uptake (5). This study allows an analysis of the relationship between low temperature inhibition of respiratory activity and the cell PD in this chill sensitive species.The results are used to define further the r...

show abstract

Temperature Dependence of the Concentration Kinetics of Absorption of Phosphate and Potassium in Corn Roots

Cited by 82 publications

References 14 publications

Effects of root-zone temperature and N, P, and K supplies on nutrient uptake of cucumber (Cucumis sativusL.) seedlings in hydroponics

Effects of root-zone temperature and N, P, and K supplies on nutrient uptake of cucumber (Cucumis sativusL.) seedlings in hydroponics

Kinetics of nutrient uptake by roots: responses to global change

An Analysis of the Relationship between Respiration and the Transmembrane Potential in Corn Roots

Contact Info

Product

Resources

About