Light environment in pre- and post-dehiscent fruits affects seed germination in Calotropis procera
2008
Sharma, S. | Amritphale, D.
Fruits in Calotropis procera can be distinguished into five discrete but contiguous stages on the basis of diameter and seed color. Seeds from dehisced fruits at stage V germinated >80% on moist substratum in darkness. This was rather unexpected because the seeds developed and matured in an FR-enriched microenvironment (R:FR ratio approximately 0.3) of the chlorophyll-containing maternal tissue and displayed low-fluence response (LFR) mode of phytochrome action. In contrast to >80% dark-germinating seeds from dehisced fruits at stage V, about 50% seeds from undehisced fruits at that stage were dark germinating, whereas another 30% seeds required light for germination. The light-requiring fraction of the seed population did not only respond to a very low-fluence R and to a short FR pulse, but also lacked R-FR reversibility thereby indicating to a very low-fluence response (VLFR) mode of phytochrome action. The present study reporting VLFR to non-dormant seed state transition in C. procera suggested that the state of phytochrome and the subsequent seed germination response in dry-seeded species, besides being determined by the light environment immediately before maturation drying, might also be regulated by a post-dehiscence light signal.
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