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Changes in Root Resistance as a Function of Applied Suction, Time of Day, and Root Temperature (1975)

SHIRAZI, G. A. ; STONE, J. F. ; CROY, L. I. ; [et al.]

Oxford, UK : Blackwell Publishing Ltd

Physiologia plantarum 33 (1975), S. 0

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ISSN: 1399-3054

Source: Blackwell Publishing Journal Backfiles 1879-2005

Topics: Biology

Notes: Water uptake rate of decapitated root systems of cotton (Gossypium hirsutum L.), tomato (Lycopersicon esculentum L. cv. Rutgers), and kidney bean (Phaseolus vulgaris L.) plants shows an exponential increase with applied suction up to about —1 bar. The water uptake rate was higher on the descending path of applied suction than on the ascending path, indicating a hysteresis effect in the roots. The root resistance in a cotton plant increased between 3-to 5-fold during the photoperiod of 12 hours. The water uptake rate increased with increasing temperature of the root medium up to 30°C in cotton and 25°C in tomato and bean plants.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1111/j.1399-3054.1975.tb03794.x

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Seasonal and diurnal variation in nitrate reductase activity of cowpeas (1987)

Rhoden, E. G. ; Croy, L. I. ; Doolittle, G.

Springer

Plant and soil 102 (1987), S. 17-19

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ISSN: 1573-5036

Keywords: anitrate ; nitrogen nutrition ; Vigna unguiculata

Source: Springer Online Journal Archives 1860-2000

Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition

Notes: Abstract The seasonal and diurnal variations in nitrate reductase activity (NRA) of cowpea cultivars were determined. Mean activity per gram fresh weight per hour averaged 31% higher in the 20 mg N/plant treatment than the control throughout the growing period. The highest activity occurred in the seedling stage and declined towards anthesis. Diurnal variations were marked by an increase in the NRA from 0600 to 1800 hours and then declined to a minimum at 2400 hours.