biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 22:374, 1980 | DOI: 10.1007/BF02908987

The changes in the growth pattern of organs ofChenopodium rubrum photoperiodically induced to flowering

J. Ullmann1, Jana Opatrná1, J. Krekule1, Libuše Pavlová1
1 Institute of Experimental Botany, Czechoslovak Academy of Sciences, Praha 6, Czechoslovakia

The relationship between photoperiodically changed growth of leaves, cotyledons, hypocotyl, roots and flowering has been investigated inChenopodium rubrum. It was found that all the growth characteristics recorded in leaves and cotyledons,i.e. length, area, dry weight and chlorophyll content, were inhibited during three inductive photoperiods (16 h darkness, 8 h light-SD) as compared with control plants grown under continuous illumination. Similarly, the cessation of root elongation and a decrease in root dry weight were observed. On the contrary, the elongation and dry weight of hypocotyl are stimulated by SD. The degree of the effect exerted by SD on the growth of different organs depends both on actual growth stage and the number of SD photoperiods. Increased relative rate of growth of roots and cotyledons was recorded in plants transferred after SD treatment to continuous illumination. However, this rise possesses only transitional character and the relative growth rate of treated plants equals that of control ones afterwards. The above growth changes are discussed as a possible modifying factor of floral differentiation.

Keywords: Growth analysis; photoperiodic induction

Received: January 31, 1980; Accepted: February 16, 1980; Published: September 1, 1980  Show citation

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Ullmann, J., Opatrná, J., Krekule, J., & Pavlová, L. (1980). The changes in the growth pattern of organs ofChenopodium rubrum photoperiodically induced to flowering. Biologia plantarum, 22(5), 374. doi: 10.1007/BF02908987
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