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Cucurbit seedlings potentially develop a peg on each side of the transition zone between the hypocotyl and root. Seedlings grown in a horizontal position suppress the development of the peg on the upper side of the transition zone in response to gravity. It is suggested that this suppression occurs due to a reduction in auxin levels to below the threshold value. We show in this study that the free...
. Formation and/or positioning of a protuberance, or peg, in cucumber (Cucumis sativus L.) seedlings is controlled by gravity. The gravisensing apparatus for this gravimorphogenesis is possibly shared with that of gravitropism. Sheath cells in the transition zone between stem and root contain sedimentable amyloplasts, but amyloplasts in cortical cells (peg cells) do not sediment uniformly. These putative...
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