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Population Differentiation in Marchantia polymorpha L. in Various Lead Pollution Levels (1972)

BRIGGS, D.

[s.l.] : Nature Publishing Group

Nature 238 (1972), S. 166-167

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ISSN: 1476-4687

Source: Nature Archives 1869 - 2009

Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics

Notes: [Auszug] I report here a preliminary study of lead levels in populations of the liverwort Marchantia polymorpha L. which is relatively common in moist shady streets in the centre of Glasgow and Edinburgh and is also found in country districts. Eleven of the samples were collected along a transect running ...

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1038/238166a0

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Enzyme formation, cellular breakdown and the distribution of gibberellins in the endosperm of barley (1972)

Briggs, D. E.

Springer

Planta 108 (1972), S. 351-358

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ISSN: 1432-2048

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary The α-amylase contents of the dorsal and ventral sides of the endosperm of barley grains increase approximately equally during germination. Aleurone tissue from all locations in the grain is equally able to make α-amylase in response to gibberellic acid, so the distribution of this enzyme reflects the distribution of endogenous gibberellins. Variations occurred in both the rate and pattern of cellular breakdown of the starchy endosperm. Generally breakdown progressed away from, and parallel to the scutellum, ultimately advancing faster adjacent to the aleurone layer. The “sheaf cells”, above the furrow, were relatively resistant to enzymic breakdown. The results indicate that gibberellins are released generally from the scutellum and induce hydrolytic enzymes equally on the dorsal and ventral sides of the grain.