Changes in organ growth ofChenopodium rubrum due to suboptimal and multiple photoperiodic cycles with and without flowering effect |
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Authors: | Jana Opatrná J Ullmann Libu?e Pavlová J Krekule |
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Institution: | (1) Institute of Experimental Botany, Czechoslovak Academy of Sciences, Praha Ke dvoru 15, 166 30 Praha 6, Czechoslovakia |
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Abstract: | The growth changes of cotyledons, leaves, hypocotyls and roots due to photoperiodic induction in short day plantChenopodium rubrum were investigated in relation to flowering. Six-day old plants were induced by photoperiods with a different number of dark
hours. We found that the degree of inhibition which occurred during induction in the growth of leaves, cotyledons and roots
similarly as the stimulation of hypocotyl is proportional to the length of dark period. The photoperiods with 12, 16 and 20
dark hours bring about marked inhibition of growth and at the same time induce flowering in terminal and axillary meristems.
The inhibitory effect of critical period for flowering,i.e. 8 dark hours, is not apparent in all criteria used and even the flower differentiation is retarded. The photoperiods of 4
and 6 dark hours did not affect growth and were ineffective in inducing flowering even if their number has been increased.
The experiments with inductive photoperiod interrupted by light break have clearly shown that growth pattern characteristic
for induced plants can be evoked in purely vegetative ones. Such statement did not exclude the possible importance of growth
inhibition as a modifying factor of flower differentiation. We demonstrated that the early events of flower bud differentiation
are accompanied by stimulation of leaf growth. The evaluation of growth and development of axillary buds at different nodes
of insertion enabled us to quantify the photoperiodic effect and to detect the effects due to differences in dark period length
not exceeding 2 hours. |
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Keywords: | vegetative organ growth analysis photoperiodic induction |
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