http://www.cnr.it/ontology/cnr/individuo/prodotto/ID184129
Regulatory networks in shade avoidance response (Contributo in atti di convegno)
- Type
- Label
- Regulatory networks in shade avoidance response (Contributo in atti di convegno) (literal)
- Anno
- 2010-01-01T00:00:00+01:00 (literal)
- Alternative label
G Sessa (1); A Ciolfi (1); M Possenti (2); S Salvucci (1); M Carabelli (1); G Morelli (2); I Ruberti (1) (2010)
Regulatory networks in shade avoidance response
in 54th Italian Society of Agricultural Genetics Annual Congress, Matera, Italy, 27-30 September, 2010
(literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
- G Sessa (1); A Ciolfi (1); M Possenti (2); S Salvucci (1); M Carabelli (1); G Morelli (2); I Ruberti (1) (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#titoloVolume
- Proceedings of the 54th Italian Society of Agricultural Genetics Annual Congress (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
- (1) Istituto di Biologia e Patolia Molecolari
(2) Istituto Nazionale di Ricerca per gli Alimenti e la Nutrizione (literal)
- Titolo
- Regulatory networks in shade avoidance response (literal)
- Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#isbn
- 978-88-904570-0-5 (literal)
- Abstract
- The success of competitive interactions between plants determines the chance of survival of
individuals and eventually of whole plant species. Shade-tolerant plants have adapted their
photosynthesis to function optimally under low-light conditions. These plants are therefore capable
of long-term survival under a canopy shade. In contrast, shade avoiding plants adapt their growth to
perceive maximum sunlight and therefore rapidly dominate gaps in a canopy. Daylight contains
roughly equal proportions of red (R) and far-red (FR) light, but within vegetation that ratio is
lowered as a result of the R absorption by photosynthetic pigments. This light quality change is
perceived through the phytochrome (phy) system as an unambiguous signal of the proximity of
neighbours resulting in the shade avoidance response (SAR). This adaptive reaction is achieved by
a set of responses including enhanced internode and petiole extension growth, increased apical
dominance, retarded leaf development, and an acceleration of flowering. However, if a plant
succeeds in the attempt to overgrow its neighbours and the photosynthetic organs perceive daylight
again, the SAR is rapidly reverted through phytochrome photoconversion. The adaptive responses
result in changes in the distribution of assimilates between leaves, stems, and roots. Since SAR
results in allocation of resources to parts of the plant both harvestable and non-harvestable, any
benefit for farmers from manipulation of the SAR in a crop will depend on the plant concerned and
the part of plant to be harvested. Significant improvement in crop yield might be achieved by a
better understanding of the adaptation mechanisms operating in the plant on the whole and at the
level of single organs. Using Arabidopsis thaliana as a model system, a network of transcription
factors acting as positive and negative regulators of shade avoidance response has been described.
Low R/FR perceived by phyB and other type II phys significantly increases the stability of several
PIF proteins which in turn induce the expression of genes coding for factors promoting shade
avoidance responses (genes early induced by low R/FR). PIFs also induce the HFR1/SICS1 gene
coding for a transcription factor that switches off the transcriptional cascade early induced by low
R/FR. Our recent data demonstrate that HFR1/SICS1 functions in the phyB signal transduction
pathway and acts in concert with another transcription factor modulated through phyA, a type I
phytochrome, in the adaptation of the plant to canopy shade. (literal)
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