1. Gravitropic response and circumnutation in pea (Pisum sativum) seedling roots.

    Physiologia Plantarum 157(1):108 (2016) PMID 26565659

    Plant circumnutation is a helical movement of growing organs such as shoots and roots. Gravitropic response is hypothesized to act as an external oscillator in shoot circumnutation, although this is subject to debate. The relationship between circumnutational movement and gravitropic response in...
  2. GNOM regulates root hydrotropism and phototropism independently of PIN-mediated auxin transport.

    Plant Science 215-216:141 (2014) PMID 24388525

    Plant roots exhibit tropisms in response to gravity, unilateral light and moisture gradients. During gravitropism, an auxin gradient is established by PIN auxin transporters, leading to asymmetric growth. GNOM, a guanine nucleotide exchange factor of ARF GTPase (ARF-GEF), regulates PIN localizat...
  3. MIZ1-regulated hydrotropism functions in the growth and survival of Arabidopsis thaliana under natural conditions.

    Annals of Botany 112(1):103 (2013) PMID 23658369 PMCID PMC3690989

    Root hydrotropism is a response to water-potential gradients that makes roots bend towards areas of higher water potential. The gene MIZU-KUSSEI1 (MIZ1) that is essential for hydrotropism in Arabidopsis roots has previously been identified. However, the role of root hydrotropism in plant growth ...
  4. Molecular mechanisms of hydrotropism in seedling roots of Arabidopsis thaliana (Brassicaceae).

    American Journal of Botany 100(1):25 (2013) PMID 23263156

    Roots show positive hydrotropism in response to moisture gradients, which is believed to contribute to plant water acquisition. This article reviews the recent advances of the physiological and molecular genetic studies on hydrotropism in seedling roots of Arabidopsis thaliana. We identified MIZ...
  5. Overexpression of MIZU-KUSSEI1 enhances the root hydrotropic response by retaining cell viability under hydrostimulated conditions in Arabidopsis thaliana.

    Plant and Cell Physiology 53(11):1926 (2012) PMID 23012350

    Because of their sessile nature, plants evolved several mechanisms to tolerate or avoid conditions where water is scarce. The molecular mechanisms contributing to drought tolerance have been studied extensively, whereas the molecular mechanism underlying drought avoidance is less understood desp...
  6. A possible involvement of autophagy in amyloplast degradation in columella cells during hydrotropic response of Arabidopsis roots.

    Planta 236(4):999 (2012) PMID 22532286

    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 gravisensi...
  7. Light and abscisic acid signalling are integrated by MIZ1 gene expression and regulate hydrotropic response in roots of Arabidopsis thaliana.

    Plant, Cell & Environment 35(8):1359 (2012) PMID 22321255

    Plant roots undergo tropic growth in response to environmental cues, and each tropic response is affected by several environmental stimuli. Even its importance, molecular regulation of hydrotropism has not been largely uncovered. Tropic responses including hydrotropism were impacted by other env...
  8. MIZ1, an essential protein for root hydrotropism, is associated with the cytoplasmic face of the endoplasmic reticulum membrane in Arabidopsis root cells.

    FEBS Letters 586(4):398 (2012) PMID 22285304

    MIZ1 is encoded by a gene essential for root hydrotropism in Arabidopsis. To characterize the property of MIZ1, we used transgenic plants expressing GFP-tagged MIZ1 (MIZ1-GFP) and mutant MIZ1 (MIZ1(G235E)-GFP) in a miz1-1 mutant. Although both chimeric genes were transcribed, the translational p...
  9. Gravistimulation changes the accumulation pattern of the CsPIN1 auxin efflux facilitator in the endodermis of the transition zone in cucumber seedlings.

    Plant Physiology 158(1):239 (2012) PMID 22065422 PMCID PMC3252099

    Cucumber (Cucumis sativus) seedlings grown in a horizontal position develop a specialized protuberance (or peg) on the lower side of the transition zone between the hypocotyl and the root. This occurs by suppressing peg formation on the upper side via a decrease in auxin resulting from a gravita...
  10. Hormonal regulation of lateral root development in Arabidopsis modulated by MIZ1 and requirement of GNOM activity for MIZ1 function.

    Plant Physiology 157(3):1209 (2011) PMID 21940997 PMCID PMC3252132

    Plant organ development is important for adaptation to a changing environment. Genetic and physiological studies have revealed that plant hormones play key roles in lateral root formation. In this study, we show that MIZU-KUSSEI1 (MIZ1), which was identified originally as a regulator of hydrotro...
  11. Factors responsible for deep-sowing tolerance in wheat seedlings: varietal differences in cell proliferation and the co-ordinated synchronization of epidermal cell expansion and cortical cell division for the gibberellin-mediated elongation of first internodes.

    Annals of Botany 108(3):439 (2011) PMID 21791455 PMCID PMC3158689

    A wheat cultivar, Triticum aestivum 'Hong Mang Mai', shows tolerance to deep-sowing conditions by extreme elongation of the first internode, likely mediated by the gibberellin (GA) response. To understand factors involved in the response of this deep-sowing-tolerant cultivar, cell expansion and ...
  12. Transcriptome analysis of gene expression during the hydrotropic response inArabidopsisseedlings

    Environmental and Experimental Botany 69(2):148 (2010)

    Because of their sessile nature, plants require appropriate strategies to adapt to the surrounding environment. Tropism is a directional growth in response to environmental stimulus that allows plants to adapt to changes in sunlight, nutrients and water. Plant roots display hydrotropism in ...
  13. Hormonal interactions during root tropic growth: hydrotropism versus gravitropism.

    Plant Molecular Biology 69(4):489 (2009) PMID 19083152

    Terrestrial plants have evolved remarkable morphological plasticity that enables them to adapt to their surroundings. One of the most important traits that plants have acquired is the ability to sense environmental cues and use them as a basis for governing their growth orientation. The directio...
  14. GNOM-mediated vesicular trafficking plays an essential role in hydrotropism of Arabidopsis roots.

    Plant Physiology 149(2):835 (2009) PMID 19052151 PMCID PMC2633850

    Roots respond not only to gravity but also to moisture gradient by displaying gravitropism and hydrotropism, respectively, to control their growth orientation, which helps plants obtain water and become established in the terrestrial environment. As gravitropism often interferes with hydrotropis...
  15. A molecular mechanism unique to hydrotropism in roots

    Plant Science 177(4):297 (2009)

    Plants are sessile in nature and must respond to various environmental cues to regulate their growth orientation. Root hydrotropism, a response to moisture gradients, has been considered to play an important role in drought avoidance. Nonetheless, the processes underlying hydrotropism in ro...
  16. Effects of locally targeted heavy-ion and laser microbeam on root hydrotropism in Arabidopsis thaliana.

    Journal of Radiation Research 49(4):373 (2008) PMID 18413976

    Classical studies on root hydrotropism have hypothesized the importance of columella cells as well as the de novo gene expression, such as auxin-inducible gene, at the elongation zone in hydrotropism; however, there has been no confirmation that columella cells or auxin-mediated signaling in the...
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  17. The gravity-regulated growth of axillary buds is mediated by a mechanism different from decapitation-induced release.

    Plant and Cell Physiology 49(6):891 (2008) PMID 18420594

    When the upper part of the main shoot of the Japanese morning glory (Pharbitis nil or Ipomoea nil) is bent down, the axillary bud situated on the uppermost node of the bending region is released from apical dominance and elongates. Here, we demonstrate that this release of axillary buds from api...
  18. P-chlorophenoxyisobutyric acid impairs auxin response for gravity-regulated peg formation in cucumber (Cucumis sativus) seedlings.

    Journal of Plant Research 121(1):107 (2008) PMID 17987258

    Cucumber (Cucumis sativus L.) seedlings form a specialized protuberance, the peg, on the transition zone between the hypocotyl and the root. When cucumber seeds germinate in a horizontal position, the seedlings develop a peg on the lower side of the transition zone. To verify the role of auxin a...
  19. Characterization of a novel gravitropic mutant of morning glory,weeping2

    Advances in Space Research 42(6):1050 (2008)

    In higher plants, gravity is a major environmental cue that governs growth orientation, a phenomenon termed gravitropism. It has been suggested that gravity also affects other aspects of morphogenesis, such as circumnutation and winding movements. Previously, we showed that these aspects of...
  20. How do Arabidopsis roots differentiate hydrotropism from gravitropism?

    Plant Signaling & Behavior 2(5):388 (2007) PMID 19704609 PMCID PMC2634222

    Root hydrotropism is a response to moisture gradients, which is considered to be important for drought avoidance. Recent reevaluation of root hydrotropism has emphasised the dominating effect of root gravitropism on it. It has been suggested that amyloplast dynamics inside columella cells and au...