Involvement of gibberellins in the stem elongation of sun and shade ecotypes of Stellaria longipes that is induced by low light irradiance

Kurepin, L.V.; Pharis, R.P.; Reid, D.M.; Chinnappa, C.C.

Plant cell and environment 29(7): 1319-1328

2006


ISSN/ISBN: 0140-7791
PMID: 17080953
DOI: 10.1111/j.1365-3040.2006.01512.x
Accession: 004518683

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Abstract
Plants from two ecotypes of Stellaria longipes, alpine (an open, sunny habitat) and prairie (where adjacent plants provide a shaded habitat), were grown under normal and reduced levels of photosynthetically active radiation (PAR). Growth under low PAR is significantly promoted in both ecotypes. When quantified by the stable isotope dilution method, endogenous gibberellins (GAs) (GA) in the early 13-hydroxylation GA biosynthesis pathway (measured at days 7, 14 and 21), we conclude that the low irradiance PAR has very likely induced an overall increase in GA biosynthesis.

Involvement of gibberellins in the stem elongation of sun and shade ecotypes of Stellaria longipes that is induced by low light irradiance