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THE INFLUENCE OF TEMPERATURE AND MOISTURE STATUS ON THE PHOTOINHIBITION OF SEED GERMINATION IN BROMUS STERILIS L. BY THE FAR‐RED ABSORBING FORM OF PHYTOCHROME
Author(s) -
HILTON JANET R.
Publication year - 1984
Publication title -
new phytologist
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.742
H-Index - 244
eISSN - 1469-8137
pISSN - 0028-646X
DOI - 10.1111/j.1469-8137.1984.tb03602.x
Subject(s) - germination , phytochrome , bromus , inhibitory postsynaptic potential , sowing , biology , botany , moisture , chemistry , agronomy , horticulture , poaceae , red light , organic chemistry , neuroscience
S ummary Germination of Bromus sterilis L. seeds is unusual in that it is inhibited when the photoreceptor phytochrome exists as Pfr, the degree of inhibition being dependent on the proportion of Pfr established. However, inhibition of germination is transitory and at 15 °C is evident only at l.5 d from sowing. Although germination is reduced at temperatures lower than 15 °C, Pfr is nevertheless inhibitory to germination; inhibition persisting far longer than at 15 °C C. Temperatures higher than 15°C C are also inhibitory to germination but at these temperatures there is no additional inhibitory effect mediated by Pfr. Under conditions of low moisture status the inhibitory effect of Pfr is also markedly increased. The results are discussed in relation to the role of light in the germination behaviour of B. sterilis seeds in the natural environment.