Biologia plantarum 43:611-613, 2000 | DOI: 10.1023/A:1002808201124
Respiration Rate and Chemical Composition of Karwinskia Roots as Affected by Temperature
- 1 Department of Plant Physiology, Faculty of Natural Sciences, Comenius University, Bratislava, Slovak Republic e-mail
Two-year-old plants of Karwinskia humboldtiana Zucc. and Karwinskia parvifolia Rose grown from the seeds in greenhouse were transferred to the growth cabinet and cultivated for two months under different temperature regimes (35/20 °C - the summer temperature regime, SR, and 20/5 °C - the winter temperature regime, WR). These temperatures were similar to the temperature conditions in the natural areas of the species studied (Nuevo León, Mexico). The root respiration rate was higher in the plants cultivated under SR than in those under WR. Roots of K. parvifolia res faster in both temperature regimes than roots of K. humboldtiana. Starch content in roots was higher in the plan cultivated under SR, however, concentrations of the other investigated organic and inorganic compounds were higher in the plants cultivated under WR. In K. humboldtiana roots, higher concentration of reducing sugars, carbon and hydrogen were found than in K. parvifolia.
Keywords: carbon; hydrogen; nitrogen; reducing sugars; starch; summer and winter temperature regime
Subjects: Karwinskia humboldtiana; Karwinskia parvifolia; reducing sugars, temperature, summer and winter; respiration, temperature, summer and winter; starch, temperature, summer and winter; temperature, summer and winter, respiration
Published: December 1, 2000 Show citation
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