Naslov
Regreening of yellow leaves
(Regreening of yelow leaves)

Autori
Fulgosi, Hrvoje ; Ljubešić, Nikola ; Wrischer, Mercedes

Vrsta, podvrsta i kategorija rada
Poglavlja u knjigama, znanstveni

Knjiga
Plastid development in leaves during growth and senescence

Urednik/ci
Biswal, Basanti ; Krupinska, Karin ; Biswal, Udaya C.

Izdavač
Springer

Grad
Dordrecht

Godina
2013

Raspon stranica
589-599

ISBN
978-94-007-5723-3

Ključne riječi
senescence, regreening, plastids, thylakoid membranes, aurea

Sažetak
Yellowing of leaves is the most widely observed manifestation of senescence in plants. Various aspects of plant cell death are extensively covered elsewhere in this book. One largely overlooked, and perhaps peculiar, feature of plant senescence is regreening of leaves which are already in advanced stages of yellowing. This rejuvenation of main energetic and nutrition tissues is governed by molecular processes and signals which are mostly uncharacterized and poorly understood. Most of the data describing regreenining of leaves comes from ultrastructural studies of plastids found in various stages of this process. Reversal of the gerontoplasts formation has been studied on the level of plastoglobuli formation and disappearance, reassembly of thylakoid structures, lipid remobilization, photosynthetic pigment retention and synthesis. Also, investigations have been focused on naturally occurring regreening models, either induced by insect habitation on leaves, or by physical damage or removal of meristematic tissues. It is now clear that plant hormones, mostly cytokinins, play very important roles in promoting reassembly of photosynthetic apparatus and consequent re-establishment of energy supply to the plant. Furthermore, a special kind of regreening was observed in some aurea mutants of deciduous woody species. Aurea mutants are able to regreen their bleached leaves several times during the vegetation season. It seems that remnants of thylakoid membrane system are necessary for re-synthesis of functional thylakoids in plants.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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