plumule

plant shoot

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July 1, 2026

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The plumule is the primary bud of a plant embryo, typically found at the apex of the hypocotyl. It consists of the embryonic leaves and the epicotyl, which develops into the plant's shoot. During germination, after the root (radicle) emerges from the seed, the plumule grows upwards, away from gravity (negatively geotropic), and towards light (positively phototropic). This upward growth helps protect the delicate tip of the young shoot as it emerges from the soil. The plumule's development is crucial for the seedling to establish itself and begin photosynthesis.12

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plant development
The emergence of the seedling
The young shoot, or plumule, is said to be negatively geotropic, because it moves away from the soil; it rises by the extension of either the hypocotyl, the region between the radicle and the cotyledons, or the epicotyl, the segment above the level of the cotyledons. If the hypocotyl…
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The young shoot, or plumule, is said to be negatively geotropic, because it moves away from the soil; it rises by the extension of either the hypocotyl, the region between the radicle and the cotyledons, or the epicotyl, the segment above the level of the cotyledons. If the hypocotyl…
Read More