Peroxisomal enzyme activities in attached senescing leaves

✍ Scribed by Laura Pistelli; Luigi Bellis; Amedeo Alpi

• Publisher: Springer-Verlag
• Year: 1991
• Tongue: English
• Weight: 239 KB
• Volume: 184
• Category: Article
• ISSN: 0032-0935
• DOI: 10.1007/bf00208249

✦ Synopsis

Recently it has been demonstrated that detached leaves show glyoxysomal enzyme activities when incubated in darkness for several days. In this report glyoxylate-cycle enzymes have been detected in leaves of rice (Oryza sativa L.) and wheat (Triticum durum L.) from either naturally senescing or dark-treated plants. Isolated peroxisomes of rice and wheat show isocitrate lyase (EC 4.1.3.1), malate synthase (EC 4.1.3.2) and β-oxidation activities. Leaf peroxisomes from dark-induced senescing leaves show glyoxylic-acid-cycle enzyme activities two to four times higher than naturally senescing leaves. The glyoxysomal activities detected in leaf peroxisomes during natural foliar senescence may represent a reverse transition of the peroxisomes into glyoxysomes.