biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 46:161-166, 2003 | DOI: 10.1023/A:1022844720795

Growth and Water Relations of Paulownia fortunei Under Photomixotrophic and Photoautotrophic Conditions

P.S. Sha Valli Khan1, T. Kozai2, Q.T. Nguyen3, C. Kubota2, V. Dhawan1
1 Plant Tissue culture, Bioresources and Biotechnology Division, Tata Energy Research Institute, New Delhi-, India
2 Laboratory of Environmental Control Engineering, Department of Bioproduction Science, Faculty of Horticulture, Chiba University, Matsudo, Chiba, Japan
3 Laboratory of Plant Cell Technology, Institute of Tropical Biology, Ho Chi Minh City, Vietnam

The growth and water relations of Paulownia fortunei in photoautotrophic cultures (nutrient medium lacking sucrose and growth regulator) with CO2 enrichment (PWAH) or without CO2 enrichment (PWAL) were compared with those in photomixotrophic shoot (PWC; 30 g dm-3 sucrose and 0.3 mg dm-3 N6-benzyladenine) and root cultures (PWR; 0.3 mg dm-3 indole-3-butyric acid). The photoautotrophic and photomixotrophic cultures were incubated under photosynthetic photon flux 125 and 60 μmol m-2 s-1, respectively. 100 % sprouting and significantly higher number of shoots (1.6) were obtained with PWAH as compared to PWAL and PWC. PWAH and PWAL stimulated spontaneous rooting from the cut end of axillary shoots. In PWAH, 84 % of shoots rooted with an average of 5.9 roots per shoot and 4.0 cm of root length in 21 d. Rooting of photomixotrophic shoot cultures were stimulated by an auxin treatment. In this case, 98.3 % of shoots were rooted with an average of 4.6 roots per shoot and 1.9 cm length. A microscopic observation on leaf abaxial surface prints from photomixotrophic shoot and root cultures showed widely open (6 - 8 μm) spherical stomata (12 - 14 μm) and from photoautotrophic cultures elliptical stomata (10 - 12 μm) with narrow openings (3 - 4 μm). Leaves from photomixo-trophic cultures had higher stomatal index as compared to photoautotrophic cultures. The rate of moisture loss from detached leaves was not varying significantly in different cultures.

Keywords: CO2 enrichment; micropropagation; stomata; water loss
Subjects: CO2 enhancement, in vitro culture, sugar supply; cytokinins; in vitro culture, micropropagation; in vitro culture, nutrient media modification; Paulownia fortunei; stomata opening, in vitro culture, sugar and CO2 supply; water loss, in vitro culture, sugar and CO2 supply

Prepublished online: March 1, 2003; Published: September 1, 2003  Show citation

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Sha Valli Khan, P.S., Kozai, T., Nguyen, Q.T., Kubota, C., & Dhawan, V. (2003). Growth and Water Relations of Paulownia fortunei Under Photomixotrophic and Photoautotrophic Conditions. Biologia plantarum46(2), 161-166. doi: 10.1023/A:1022844720795
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