Role of ABA and ABI3 in Desiccation Tolerance

Khandelwal, Abha; Cho, S. H.; Marella, Heather; Sakata, Yoichi; Perroud, Pierre‐François; Pan, Aijun; Quatrano, Ralph S.

doi:10.1126/science.1183672

Cited by 192 publications

(200 citation statements)

References 8 publications

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“…As has been shown in other species, sporophytes are more sensitive to both desiccative (Tortula; Stark et al, 2007) and temperature (Microbryum;McLetchie and Stark, 2006) stresses than their associated gametophytes, suggesting that physiological mechanisms for desiccation tolerance (e.g. Oliver et al, 2005;Khandelwal et al, 2010) are not as well developed or are lacking in sporophytes. Since both generations contain identical genomes that only in differ in their ploidy level, these physiological differences are most likely due to differential gene expression.…”

Section: Discussionmentioning

confidence: 82%

Dehydration protection provided by a maternal cuticle improves offspring fitness in the moss Funaria hygrometrica

2013

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† Background and Aims In bryophytes the sporophyte offspring are in contact with, nourished from, and partially surrounded by the maternal gametophyte throughout their lifespan. During early development, the moss sporophyte is covered by the calyptra, a cap of maternal gametophyte tissue that has a multilayered cuticle. In this study the effects on sporophyte offspring fitness of removing the maternal calyptra cuticle, in combination with dehydration stress, is experimentally determined. † Methods Using the moss Funaria hygrometrica, calyptra cuticle waxes were removed by chemical extraction and individuals were exposed to a short-term dehydration event. Sporophytes were returned to high humidity to complete development and then aspects of sporophyte survival, development, functional morphology, and reproductive output were measured. † Key Results It was found that removal of calyptra cuticle under low humidity results in significant negative impacts to moss sporophyte fitness, resulting in decreased survival, increased tissue damage, incomplete sporophyte development, more peristome malformations, and decreased reproductive output. † Conclusions This study represents the strongest evidence to date that the structure of the calyptra cuticle functions in dehydration protection of the immature moss sporophyte. The investment in a maternal calyptra with a multilayered cuticle increases offspring fitness and provides a functional explanation for calyptra retention across mosses. The moss calyptra may represent the earliest occurance of maternal protection via structural provisioning of a cuticle in green plants.

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Section: Discussionmentioning

confidence: 82%

Dehydration protection provided by a maternal cuticle improves offspring fitness in the moss Funaria hygrometrica

2013

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“…It is further conceivable that both Med25 and DREB2A could function as downstream components in the ABA pathway. We note that ABI3, encoding a key mediator of the ABA response (23), is among the genes that are induced by dehydration in Physcomitrella (22).…”

Section: Discussionmentioning

confidence: 99%

The Arabidopsis thaliana Med25 mediator subunit integrates environmental cues to control plant development

Elfving

Davoine

Benlloch

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

144

187

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Development in plants is controlled by abiotic environmental cues such as day length, light quality, temperature, drought, and salinity. These signals are sensed by a variety of systems and transmitted by different signal transduction pathways. Ultimately, these pathways are integrated to control expression of specific target genes, which encode proteins that regulate development and differentiation. The molecular mechanisms for such integration have remained elusive. We here show that a linear 130-aminoacids-long sequence in the Med25 subunit of the Arabidopsis thaliana Mediator is a common target for the drought response element binding protein 2A, zinc finger homeodomain 1, and Myb-like transcription factors which are involved in different stress response pathways. In addition, our results show that Med25 together with drought response element binding protein 2A also function in repression of PhyB-mediated light signaling and thus integrate signals from different regulatory pathways.

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“…Abscisic acid (ABA) is an isoprenoidderived stress and drought hormone whose function can be traced back to the earliest embryophyte clade, the bryophytes (Cutler and Rodriguez 2010;Khandelwal et al 2010;Hauser et al 2011). Although its function in land plants is associated with the transition to terrestrial life, ABA is also produced by a wide variety of aquatic green algae, although its function in these algae is unknown (Hartung 2010).…”

Section: Hormonal Signalingmentioning

confidence: 99%

Green Algae and the Origins of Multicellularity in the Plant Kingdom

Umen

2014

Cold Spring Harbor Perspectives in Biology

121

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The green lineage of chlorophyte algae and streptophytes form a large and diverse clade with multiple independent transitions to produce multicellular and/or macroscopically complex organization. In this review, I focus on two of the best-studied multicellular groups of green algae: charophytes and volvocines. Charophyte algae are the closest relatives of land plants and encompass the transition from unicellularity to simple multicellularity. Many of the innovations present in land plants have their roots in the cell and developmental biology of charophyte algae. Volvocine algae evolved an independent route to multicellularity that is captured by a graded series of increasing cell-type specialization and developmental complexity. The study of volvocine algae has provided unprecedented insights into the innovations required to achieve multicellularity.

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Role of ABA and ABI3 in Desiccation Tolerance

Cited by 192 publications

References 8 publications

Dehydration protection provided by a maternal cuticle improves offspring fitness in the moss Funaria hygrometrica

Dehydration protection provided by a maternal cuticle improves offspring fitness in the moss Funaria hygrometrica

The Arabidopsis thaliana Med25 mediator subunit integrates environmental cues to control plant development

Green Algae and the Origins of Multicellularity in the Plant Kingdom

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