Temperature Effects on the Activity of the Alternative Respiratory Pathway in Chill-Sensitive Cucumis sativus1

AUTOR(ES)

Kiener, Catherine M.

RESUMO

After 48 hours at 2°C, hypocotyls from chill-sensitive Cucumis sativus seedlings showed a burst of O2 uptake. The alternative pathway became engaged to close to 45% full capacity during this postchilling respiratory burst. However, it only accounted for up to 50% of this increased respiratory O2 uptake. By 24 hours after chilling, when the seedlings were fully recovered from visible symptoms of chilling injury, the flux through the alternative pathway was back to the level (about 10%) found before chilling. Blocking chilling-induced ethylene production with aminoethoxyvinylglycine had no effect on this increased utilization of the alternative pathway.

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