Summary
We have described some characteristics of Lolium multiflorum cultivated under very short photoperiods (2 hours and 1 hour). The estimations of leaf growth were based on dry weight, surface measurements, and chlorophyll content. The pigment analyses were carried out by column chromatography; chloroplast ultrastructure was observed after chemical fixation.
These measurements have permitted us to note a sharp drop in the growth curve of plants grown under different day-lengths: the limiting photoperiod lies between 1 hour and 2 hours of daily illumination.
Pigment analyses and chloroplast ultrastructure observations show that there is a greater difference between plants cultivated under 1 hour and 2 hours of daily illumination than between plants cultivated under 2 hours and 12 hours.
A decrease in day-length causes a deficit in the chlorophyll b content as well as a poor development of the grana.
We have attempted to correlate these structural anomalies with the abnormal chlorophyll a/chlorophyll b ratio.
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Reyss, A., Bourdu, R. Influence des héméropériodes très courtes sur la croissance de Lolium multiflorum, sa composition pigmentaire et l'ultrastructure chloroplastique. Planta 97, 230–244 (1971). https://doi.org/10.1007/BF00389204
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DOI: https://doi.org/10.1007/BF00389204