Desiccation sensitivity of recalcitrant and orthodox seeds in relation to the stage of seed development and germination
1992
Baran Wirawan
Results confirmed the parallelism of soybean and cacao seeds in response to desiccation. At immature stage 25 days after anthesis (DAA) for soybean and 4.5 months after anthesis (MAF) for cacao both seeds are desiccation-sensitive. Soybean seeds become desiccation-tolerant at 30-35 DAA (slow drying) and 40 DAA (fast drying). In cacao, this stage corresponded to 5 MAF irrespective of drying rates. The tolerance of cacao seed to drying (a very short time, 5 to 5.5 MAF) is further limited by a relatively high critical moisture content (30%). Drying to 20% moisture content results in cacao with germination and vigor index only 10.67 and 1.33%, respectively. The physiological maturity stage was observed at 40 DAA and 5 MAF for soybean and cacao, respectively. It is suggested that this is the ideal time to harvest soybean and cacao seeds, respectively.
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