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Main conclusion Transgenic tobacco plants overexpressing the monoterpene alcohol geraniol synthase exhibit hypersensitivity to thermal stress, possibly due to suppressed sugar metabolism and transcriptional regulation of genes involved in thermal stress tolerance.Monoterpene alcohols function in plant survival strategies, but they may cause self-toxicity to plants due to their hydrophobic and highly...
Seedling roots display not only gravitropism but also hydrotropism, and the two tropisms interfere with one another. In Arabidopsis (Arabidopsis thaliana) roots, amyloplasts in columella cells are rapidly degraded during the hydrotropic response. Degradation of amyloplasts involved in gravisensing enhances the hydrotropic response by reducing the gravitropic response. However, the mechanism by which...
Auxin transport network, which is important in the integration of plant developmental signals, depends on differential expression of the auxin efflux carrier PIN gene family. We cloned three tomato PIN (referred as SlPIN) cDNAs and examined their expression patterns in fruit and other organs. The expression of SlPIN1 and SlPIN2 was highest in very young fruit immediately after anthesis, whereas the...
When cucumber seeds are germinated horizontally, an outgrowth (peg) develops on the lower side of the transition zone between the hypocotyl and the root for pulling the cotyledons and plumule out of the seed coat. We previously suggested that gravistimulation suppresses peg formation on the upper side of the transition zone when placed in a horizontal position. In the gravistimulated transition zone,...
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...
Abstract. We have developed experimental systems to study hydrotropism in seedling roots of Arabidopsis thaliana (L.) Heynh. Arabidopsis roots showed a strong curvature in response to a moisture gradient, established by applying 1% agar and a saturated solution of KCl or K2CO3 in a closed chamber. In this system, the hydrotropic response overcame the gravitropic response. Hydrotropic curvature commenced...
Abstract. Cucumber (Cucumis sativus L.) seedlings grown in microgravity developed a peg on each side of the transition zone between hypocotyl and root, whereas seedlings grown in a horizontal position on the ground developed a peg on the concave side of the gravitropically bending transition zone. The morphological features of the space-grown seedlings were similar to those of seedlings grown in a...
Abstract.Seedlings of most cucurbitaceous plants develop a peg (protuberance caused by cell outgrowth) on the transition zone between the hypocotyl and root. The peg is necessary for removing the seed coat after germination. In our spaceflight experiments on the STS-95 space shuttle, Discovery, we found that cucumber (Cucumis sativus L.) seedlings grown under microgravity conditions developed two...
. 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...
Abstract. 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...
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