SOME EFFECTS OF LIGHT ON LEAF GROWTH IN PISUM SATIVUM AND TROPAEOLUM MAJUS
1963; Wiley; Volume: 2; Issue: 3 Linguagem: Inglês
10.1111/j.1751-1097.1963.tb08131.x
ISSN1751-1097
Autores Tópico(s)Isotope Analysis in Ecology
ResumoAbstract— The effect of wave‐length of light on leaf expansion in Tropaeolum majus ‘Double Orange Gleam’ and Pisurn sativum ‘Meteor’ has been studied. In both species leaf growth is strongly promoted by light. Increasing the daily duration of exposure to light increased leaf expansion in Tropueolum in both blue and red wave‐bands over a range of light intensities. In Pisum a similar effect of ail increase in duration of irradiation was found over the whole range of intensities used for blue light but only at the highest intensity for red light: at the two lower intensities in red an increase in duration of the light treatment beyond 1 hr did not increase leaf expansion. In both species a period of 4 hr of blue followed by 4 hr of red promoted leaf growth more than 4 hr of red followed by 4 hr of blue. The effect of a 4 hr period of red light was largely prevented when it was followed by far‐red; the effect of 4 hr of blue light, on the other hand, was not affected by subsequent exposure to far‐red. It is concluded that leaf growth in Pisum and Tropaeolum is dependent not only on the ‘low‐energy’ red/far‐red reversible reaction but also on one or more ‘high‐enerFy’ photo‐reactions.
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