Ethylene production and metabolism of 1-aminocyclopropane-1-carboxylic acid in a long-day plant,Chenopodium murale L., as influenced by photoperiodic flower induction |
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Authors: | I Macháčková J Ullmann J Krekule M Stock |
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Institution: | (1) Institute of Experimental Botany, Czechoslovak Academy of Sciences, Prague 6, Czechoslovakia;(2) Institute of Plant Biochemistry, Academy of Sciences of East Germany, Weinberg, Halle/Saale, Germany |
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Abstract: | Chenopodium murale plants, induced to flower by 5 days of continuous light, produced 43% more ethylene than vegetative plants kept under short
days (16 h darkness, 8 h light). The 1-aminocyclopropane-1-carboxylic acid (ACC)-induced ethylene production, using saturating
ACC concentration (10 mol·m−3) was also 55% higher in induced plants. Their ACC and N-malonyl-ACC (MACC) levels were also higher, the former increasing
by 56% in both shoots and roots, the latter by 288% and 108% in shoots and roots, respectively. Administration of labeled
2,3-14C]ACC produced a very similar relative content of ACC and MACC in both treatments. The only process influenced by flower induction
was ACC conversion to ethylene. Induced plants converted 66% more ACC than the vegetative ones. The effects of photoperiod
on ethylene formation and metabolism in a long-day plant (LDP)C. murale and a short-day plant (SDP)C. rubrum are compared. Ethylene formation seems to be under photoperiodic control in both species, but its role in flower induction
remains obscure. |
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