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RELATION BETWEEN RESPONSIVENESS TO LIGHT AND RESPIRATORY ACTIVITY IN SEEDS OF OLDENLANDIA CORYMBOSA (TROPICAL RUBIACEAE)

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The time course of the changes in responsiveness to light and respiratory activity of Oldenlandia corymbosa seeds was followed during their imbibition in darkness at 20°C and 35°C. The effect of respiratory inhibitors (KCN and NaN3) on responsiveness to light (4 hours of white light exposure) was also studied. At 35°C, responsiveness to light and respiratory activity increased over a period of about one day, and then decreased, the decrease in respiratory activity preceding that of responsiveness to light. At 20°C, responsiveness to light increased more slowly than at 35°C, but then remained high. The respiratory activity exhibited a similar time course. Transfer of seeds from 35°C to 20°C, or inversely, showed that the effect of both temperatures was perfectly reversible. The inhibition of respiration (by KCN or NaN3) produced a decrease in the responsiveness to light. The ascion was also completely reversible. There exists therefore a close relationship between the seed responsiveness to light and respiratory activity. A 4-hour irradiation permitted germination only when respiration was sufficiently intense.

Affiliations: 1: Laboratorie de Physiologie des Organes Végétaux après Récolte, C.N.R.S.

10.1080/0021213X.1986.10677049
/content/journals/10.1080/0021213x.1986.10677049
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/content/journals/10.1080/0021213x.1986.10677049
1986-05-13
2018-06-24

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