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Annals of Botany 41: 1217-1223, 1977
© 1977 Annals of Botany Company

RESEARCH-ARTICLE

Environmental Control of Flower Number in Multi-flowered Cultivars of Pisum sativum L.

C. C. HOLE

National Vegetable Research Station Wellesbourne, Warwick CV 35 9EF

Received: 7 February 1977   

Pea cultivars capable of regularly producing more than two flowers per node were grown at temperatures ranging from 10 to 25 °C. There was positive correlation between flower number per node and air temperature. Genotypic variation in the size of this response to temperature was observed. For example, those cultivars witha mean of 3•0 flowers per node at 10 °C gave means of 6•2, 5•7 and 3•5 at 25 °C. The concentration of soluble sugars in the shoot at flower initiation was negatively correlated with air temperature and flower number per node. An increase in radiation intensity from 60 to 120 J m–2 s–1 however, resulted in increased numbers of flowers per node. These environmental effects are contrasted with effects on cultivars regularly producing fewer than two flowers per node and possible control mechanisms are indicated.


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