Rice shoot branching requires an ATP‐binding cassette subfamily G protein

Yasuno, Nobuhiro; Takamure, Itsuro; Kidou, Shin‐ichiro; Tokuji, Yoshihiko; Ureshi, An-na; Funabiki, Atsushi; Ashikaga, Kazunori; Yamanouchi, Utako; Yano, Masahiro; Kato, Kiyoaki

doi:10.1111/j.1469-8137.2008.02724.x

Cited by 35 publications

(44 citation statements)

References 70 publications

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“…Suberin in roots of the abcg2-1 abcg6-1 abcg20-1 mutant had decreased proportions of 20:0 and 22:0 fatty acids, 22:0 fatty alcohol, and 18:1 v-hydroxy fatty acid, raising the possibility that the mutant is deficient in exporting fatty acids or fatty alcohols. Consistent with a possible fatty acid transport defect, rice plants mutant for OsABCG5/RCN1, encoding a putative ortholog of the entire clade of Arabidopsis ABCG proteins studied here (Yasuno et al, 2009), had root hypodermis suberin with decreased amounts of 28:0 and 30:0 fatty acids, several v-hydroxyacids, and C16 and C18 diacids (Shiono et al, 2014). By contrast, the Arabidopsis dso/abcg11 mutant, which is mostly affected in cutin composition, had significant reductions in some suberin components but not in C22:0 acid or alcohol (Panikashvili et al, 2010).…”

Section: Abcg Proteins May Transport Aliphatic Polymer Precursorssupporting

confidence: 59%

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ABCG Transporters Are Required for Suberin and Pollen Wall Extracellular Barriers inArabidopsis

et al. 2014

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Effective regulation of water balance in plants requires localized extracellular barriers that control water and solute movement. We describe a clade of five Arabidopsis thaliana ABCG half-transporters that are required for synthesis of an effective suberin barrier in roots and seed coats (ABCG2, ABCG6, and ABCG20) and for synthesis of an intact pollen wall (ABCG1 and ABCG16). Seed coats of abcg2 abcg6 abcg20 triple mutant plants had increased permeability to tetrazolium red and decreased suberin content. The root system of triple mutant plants was more permeable to water and salts in a zone complementary to that affected by the Casparian strip. Suberin of mutant roots and seed coats had distorted lamellar structure and reduced proportions of aliphatic components. Root wax from the mutant was deficient in alkylhydroxycinnamate esters. These mutant plants also had few lateral roots and precocious secondary growth in primary roots. abcg1 abcg16 double mutants defective in the other two members of the clade had pollen with defects in the nexine layer of the tapetum-derived exine pollen wall and in the pollen-derived intine layer. Mutant pollen collapsed at the time of anther desiccation. These mutants reveal transport requirements for barrier synthesis as well as physiological and developmental consequences of barrier deficiency.

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Section: Abcg Proteins May Transport Aliphatic Polymer Precursorssupporting

confidence: 59%

“…It is likely that altered root permeability affects development of many plants. For example, rice abcg5/rcn1 mutants defective in a closely related transporter also have a defective suberin barrier and altered root and shoot architecture (Yasuno et al, 2009;Ureshi et al, 2012;Shiono et al, 2014).…”

Section: Physiological Importance Of Barriersmentioning

confidence: 99%

ABCG Transporters Are Required for Suberin and Pollen Wall Extracellular Barriers inArabidopsis

et al. 2014

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“…The rcn1 (rcn1-2) mutant has a single nucleotide substitution in the gene encoding a member of the ATP-binding cassette (ABC) transporter subfamily G, RCN1/OsABCG5, causing an Ala-684Pro substitution (Yasuno et al, 2009). The mutation results in several mutant phenotypes, although the substrates of RCN1/OsABCG5 have not been determined (Ureshi et al, 2012;Funabiki et al, 2013;Matsuda et al, 2014).…”

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confidence: 99%

Ethylene Biosynthesis Is Promoted by Very-Long-Chain Fatty Acids during Lysigenous Aerenchyma Formation in Rice Roots

et al. 2015

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In rice (Oryza sativa) roots, lysigenous aerenchyma, which is created by programmed cell death and lysis of cortical cells, is constitutively formed under aerobic conditions, and its formation is further induced under oxygen-deficient conditions. Ethylene is involved in the induction of aerenchyma formation. reduced culm number1 (rcn1) is a rice mutant in which the gene encoding the ATP-binding cassette transporter RCN1/OsABCG5 is defective. Here, we report that the induction of aerenchyma formation was reduced in roots of rcn1 grown in stagnant deoxygenated nutrient solution (i.e. under stagnant conditions, which mimic oxygen-deficient conditions in waterlogged soils). 1-Aminocyclopropane-1-carboxylic acid synthase (ACS) is a key enzyme in ethylene biosynthesis. Stagnant conditions hardly induced the expression of ACS1 in rcn1 roots, resulting in low ethylene production in the roots. Accumulation of saturated very-long-chain fatty acids (VLCFAs) of 24, 26, and 28 carbons was reduced in rcn1 roots. Exogenously supplied VLCFA (26 carbons) increased the expression level of ACS1 and induced aerenchyma formation in rcn1 roots. Moreover, in rice lines in which the gene encoding a fatty acid elongase, CUT1-LIKE (CUT1L; a homolog of the gene encoding Arabidopsis CUT1, which is required for cuticular wax production), was silenced, both ACS1 expression and aerenchyma formation were reduced. Interestingly, the expression of ACS1, CUT1L, and RCN1/OsABCG5 was induced predominantly in the outer part of roots under stagnant conditions. These results suggest that, in rice under oxygen-deficient conditions, VLCFAs increase ethylene production by promoting 1-aminocyclopropane-1-carboxylic acid biosynthesis in the outer part of roots, which, in turn, induces aerenchyma formation in the root cortex.Aerenchyma formation is a morphological adaptation of plants to complete submergence and waterlogging of the soil, and facilitates internal gas diffusion (Armstrong,

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“…In addition to ABA, cytokinin-mediated signaling seems to control plant development under nitrogen deficiency, and coordinated changes in cytokinin, auxin, and ethylene concentrations may reprogram development under phosphorus deficiency (Hammond et al 2004, Ticconi and Abel 2004, Franco-Zorrilla et al 2004). RCN1/OsABCG5 mRNA accumulates not only in leaf primordia of main and axillary shoots and in the vascular cells and leaf epidermis of older leaves, but also in the crown root primordia, endodermis, pericycle, and stele in the roots (Yasuno et al 2009). In future studies, we need to clarify which element and phytohormone is associated with RCN1/ OsA-BCG5 function in roots.…”

Section: Discussionmentioning

confidence: 99%

“…This suggests that rcn1-2 mutation reduces plant development for sensing nutrient shortage and/or reduces nutrient uptake from the soil under low-nutrient conditions (Ariyaratna et al 2011). We determined that RCN1 encodes a novel protein in the ATP-binding cassette protein G (ABCG) subfamily, also known as the white-brown complex (WBC) subfamily, OsABCG5 (OsWBC5) (Yasuno et al 2009). The molecular function of RCN1/OsABCG5 remains to be elucidated.…”

Section: Introductionmentioning

confidence: 99%

The rice RCN1/OsABCG5 mutation is associated with root de-velopment in response to nutrient shortage

et al. 2012

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_____________________________________________________________________________________________________________________________________________________________________________Ureshi A, Matuda S, Ohashi E, Onishi K, Takamure I, Kato K 2012 The rice RCN1/OsABCG5 mutation is associated with root development in response to nutrient shortage. Abstract: Plants constantly sense changes in their environment. When nutrient elements are scarce, plants often allocate a greater proportion of their biomass to the root system. In the present study, we characterized the early root development of rice reduced culm number (rcn) mutants under standard growth conditions. Short lateral root length was consistent in five rcn mutants, and the remaining root traits varied between the rcn mutants. Subsequently, we characterized the effects of rcn1 mutation in response to nutrient shortage. Root development, involving the elongation of seminal, crown, and lateral roots and branching of the lateral roots, was promoted in wild type in response to nutrient shortage. However, in rcn1 mutants, crown root elongation was constant and lateral root branching was reduced in response to nutrient shortage. The present results indicate that RCN1/OsABCG5 is associated with root development in response to nutrient shortage.

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Rice shoot branching requires an ATP‐binding cassette subfamily G protein

Cited by 35 publications

References 70 publications

ABCG Transporters Are Required for Suberin and Pollen Wall Extracellular Barriers inArabidopsis

ABCG Transporters Are Required for Suberin and Pollen Wall Extracellular Barriers inArabidopsis

Ethylene Biosynthesis Is Promoted by Very-Long-Chain Fatty Acids during Lysigenous Aerenchyma Formation in Rice Roots

The rice RCN1/OsABCG5 mutation is associated with root de-velopment in response to nutrient shortage

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