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Light sensitivity of Haberlea rhodopensis shade adapted phenotype under drought stress

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Tartalom: http://real.mtak.hu/63028/
Archívum: MTA Könyvtár
Gyűjtemény: Status = Published


Type = Article
Cím:
Light sensitivity of Haberlea rhodopensis shade adapted phenotype under drought stress
Létrehozó:
Georgieva, Katya
Solti, Ádåm
MĂŠszĂĄros, Ilona
Keresztes, Áron
Sárvári, Éva
Kiadó:
Springer Verlag
Dátum:
2017-07-11
Téma:
QK10 Plant physiology / nĂśvĂŠnyĂŠlettan
QK20 Plant morphology. Plant anatomy / nĂśvĂŠnymorfolĂłgia, -anatĂłmia
Tartalmi leírás:
Haberlea rhodopensis belongs to the group of
homoiochlorophyllous desiccation-tolerant plants which
preserve their chlorophyll content during dehydration. It is
a typical shade adapted plant and it is proved to be very
sensitive to light intensity higher than the natural during
drought stress. To reveal the reasons of their light sensitivity,
we compared the damages and protective mechanisms
of shade plants during desiccation either simulating
their natural light conditions (30 lmol photons m-2 s-1,
LL) or at a moderately higher light intensity
(100 lmol photons m-2 s-1, ML). In the desiccated stage,
no damage could be discovered in terms of thylakoid
membrane quantity or integrity either at LL or ML. Nevertheless,
the altered structure and localization of chloroplasts
did not restore in plants desiccated and rehydrated at
ML, where no starch could be re-synthesized, but a number
of plastoglobuli appeared. The PSII activity and the amount
of b-carotene and lutein decreased more strongly in ML
leaves in agreement with their higher MDA production.
Lack of recovery of ML plants may be connected with the
very high number of damaged PSII reaction centres caused
by the loss of the subtle balance between ROS production
and scavenging. In addition, because of the impaired starch
re-synthesis, there is no sink for the water-replacing sugars
and water cannot be taken up which proved to be lethal to
ML plants.
Nyelv:
magyar
Típus:
Article
PeerReviewed
info:eu-repo/semantics/article
Formátum:
text
Azonosító:
Georgieva, Katya and Solti, Ádám and Mészáros, Ilona and Keresztes, Áron and Sárvári, Éva (2017) Light sensitivity of Haberlea rhodopensis shade adapted phenotype under drought stress. ACTA PHYSIOLOGIAE PLANTARUM, 39. p. 164. ISSN 0137-5881
Kapcsolat:
https://doi.org/10.1007/s11738-017-2457-y
10.1007/s11738-017-2457-y