Elsevier

Scientia Horticulturae

Volume 44, Issues 3–4, November 1990, Pages 309-314
Scientia Horticulturae

Effects of temperature and light quality on growth and flowering of Begonia × hiemalis Fotsch. and Campanula isophylla Moretti

https://doi.org/10.1016/0304-4238(90)90131-WGet rights and content

Abstract

The effect of different spectral energy distributions (light qualities) on the growth and flowering of the short-day plant Begonia × hiemalis and the long-day plant Campanula isophylla was studied at 18, 24 and 28°C day temperature. Three light qualities were established in growth chambers by selective screening of the daylight: natural (N), blue (B) with a high red/far-red ratio and yellow (Y) with a low blue/red ratio.

In both species, B generally reduced plant dry weight compared with N and Y, irrespective of temperature. In most cases, shoot length and plant diameter were reduced in B and increased in Y compared with N light. The time until flowering was not significantly affected by light quality in Begonia, while B delayed flowering by 2 days in Campanula. In Begonia, Y gave the highest number of flowers at 18°C, Y and N were superior to B at 24°C, while all light qualities gave similar effects at 28°C. In Campanula, the number of flowers was greatest in N, followed by Y and finally by B.

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Present address: Særheim Research Station, N-4062 Klepp St., Norway.

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