γ-Radiation Induces Leaf Trichome Formation in Arabidopsis1

Nagata, Toshifumi; Todoriki, Setsuko; Hayashi, Toru; Shibata, Yuriko; Mori, Masaki; Kitano, Hiromi; Kikuchi, Shoshi

doi:10.1104/pp.120.1.113

Cited by 55 publications

(37 citation statements)

References 28 publications

(28 reference statements)

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“…It is reported that a weak allele of GL1, gl1-2, is normally glabrous but restores dense trichome formation in response to gamma-ray irradiation (Esch et al, 1994;Nagata et al, 1999). The reactive oxygen species (ROS) produced by water radiolysis are likely to be the inducers of trichome formation in irradiated gl1-2.…”

Section: Discrete Domains Of Gl1 Contribute To Trichome Induction Difmentioning

confidence: 99%

Jasmonic acid control of GLABRA3 links inducible defense and trichome patterning inArabidopsis

et al. 2009

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Once attacked by herbivores, plants regenerate new leaves with increased trichome density as an inducible defense. Trichomes are specified from neighboring epidermal cells through local cell-cell interactions in the leaf primordia. However, the molecular mechanism of how herbivore-induced damage at older leaves remodels the pattern of trichome fate specification at newly forming leaves is largely unknown. In this study, we show that mutations in either the biosynthetic or signaling pathway of jasmonates (JAs), long-distance wound signals, abolish the wound-induced formation of trichomes. To identify the factors linking JA signaling to trichome fate specification, we isolated a novel class of mutants, unarmed (urm), which lack trichome induction but show otherwise normal responses to JAs. URM9 encodes an Importin β family protein, and URM23 is identical to TRANSPARENT TESTA GLABRA1 (TTG1), the product of which interacts with the bHLH transcription factor GLABRA3 (GL3). Loss of either URM9 or URM23 disrupts the subnuclear localization of GL3, thus implicating GL3 in trichome induction. The expression of GL3 was enhanced by JA treatment prior to trichome initiation. Genetic analysis of multiple trichome mutants shows that GL3, in concert with the R2R3-Myb transcription factor GLABRA1 (GL1), promotes trichome fate in response to JA in a dosage-dependent manner. These results indicate that GL3 is a key transcription factor of wound-induced trichome formation acting downstream of JA signaling in Arabidopsis.

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Section: Discrete Domains Of Gl1 Contribute To Trichome Induction Difmentioning

confidence: 99%

Jasmonic acid control of GLABRA3 links inducible defense and trichome patterning inArabidopsis

et al. 2009

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“…With regard to drought, among the most possible indicators of water requirement in plant are stomata and trichomes (Adulrahaman, 2009). Drought may influence trichomes formation and structures of stomata (Nagata et al, 1999;Höglund and Larsson, 2005) Trichomes are hair-like appendages that develop from cells of the upper and lower epidermis found in most plant species (Werker, 2000). The structure of trichomes can range from unicellular to multicellular, and the trichomes can be straight, spiral, hooked, branched, or un-branched (Southwood, 1986).…”

Section: Introductionmentioning

confidence: 99%

Anatomical response of wheat cultivars to drought stress

David¹,

Osonubi²,

Olaiya³

et al. 2017

Ife Journal of Science

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The study was carried out to investigate the responses of drought stress on wheat tissues. Five wheat cultivars Alta 84 (AL), Atila (AT), Cettia (CE), Norman Bourgluk 2008 (NB) and Seri M82 (SE) were cultivated. Four weeks after planting, healthy plants were subjected to four treatments viz-well-watered (D1), watered daily, drought stress (D2), one weekly watering, drought stress (D3), two weekly watering and drought stress (D4), and three weekly watering. The experiment was a factorial experiment conducted in a completely randomized design (CRD) with three replicates; Transverse section (TS) of the leaves collected were sectioned using microtome, stained and observed under compound microscope. Mesophyll cells, vascular bundles, bundle sheaths and xylem tissues were measured using ocular micrometer. Epidermal peels were prepared to determine the number of stomata and trichomes. When drought stress was imposed (D2, D3 and D4), wheat cultivar Cettia developed larger mesophyll cells, xylem tissues, vascular bundles and bundle sheaths than other cultivars. Thus, larger vascular bundles would facilitate faster movement of water and mineral salts up to the shoot from the root. Cultivar Atila developed higher number of trichomes during drought stress D2 than other cultivars which help to reduce the rate of transpiration of water out of the epidermal leaves. Wheat cultivars Cettia and Atila could be drought tolerant cultivars. Generally, wheat cultivars developed stable stomata number and stomata closure mechanism to cope with drought stress. There was an increase in number of trichomes at D2, D3 and D4 which revealed the ecologically adaptation of wheat plants to drought stress.

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“…It has been reported that low dose gamma radiation provokes in plants: various physiological changes on the cellular level, 6 promoted expression of specific genes, e.g., those for antioxidative defense enzymes, 10-12 hormesis, 13 cross-adaptation to UV-B irradiation, high-intensity light, and drought stress, 11,14 increased biomass yield, plant vigor and growth, and grain yield, 11,[15][16][17] fruit ripening, 18 enhancements of embryogenesis, 19 and additional trichome formation. 8 The link between PGA and low dose gamma radiation-activated redox signaling cascades is implicated by the observation that the radiation induces drastic inhibition of PGA-decomposing enzyme polygalacturonase and the upregulation of pectin methylesterase, 18 thus Figure 1. the principles of low dose radiation-redox signaling conversion conducted by PgA in plants.…”

Section: Disclosure Of Potential Conflicts Of Interestmentioning

confidence: 99%

“…Even more, it has been shown that low dose gamma radiation-provoked trichome formation in Arabidopsis was prevented by the supplementation of antioxidants, and it has been proposed that the effects are mediated by reactive oxygen species generated by water radiolysis. 8 The transformation of the primary product of H 2 O 2 UV-lysis and water radiolysis -…”

Section: 9mentioning

confidence: 99%

“…7,8 Hydrogen peroxide is the key species in redox signaling showing the ability to modulate different biological processes by activating/inhibiting gene transcription and enzyme activity. 5,9 Even more, at concentrations in the high physiological range, H 2 O 2 induces more permanent, modifying changes, adaptations, increasing the resistance of biological systems to the same stimulus (hormesis) or other stressors (cross-adaptation).…”

mentioning

confidence: 99%

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