Cellular boron allocation and pectin composition in two citrus rootstock seedlings differing in boron-deficiency response
Identifieur interne : 001136 ( Main/Exploration ); précédent : 001135; suivant : 001137Cellular boron allocation and pectin composition in two citrus rootstock seedlings differing in boron-deficiency response
Auteurs : Gui-Dong Liu [République populaire de Chine] ; Rui-Dong Wang [République populaire de Chine] ; Lei-Chao Liu [République populaire de Chine] ; Li-Shu Wu [République populaire de Chine] ; Cun-Cang Jiang [République populaire de Chine]Source :
- Plant and soil [ 0032-079X ] ; 2013.
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Abstract
Aims Variation in boron (B) efficiency in citrus in different rootstock genotypes is expressed as large differences in the occurrence of leaf symptoms and dry mass production under low B conditions, but the mechanisms responsible for such differences are unknown. This paper aims to determine whether differences in B uptake, cellular B allocation, and pectin content can explain genotype differences in B efficiency between B-efficient citrange (Citrus sinensis (L.) Osb. x Poncirus trifoliata (L.) Raf.) and B-inefficient trifoliate orange (Poncirus trifoliata (L.) Raf.) citrus rootstock. Methods Plants were grown hydroponically in a nutrient solution supplemented with 5 μMB for 14 days and then transferred to a B-free medium (0 μMB) or control medium (5 μM B) for 35 days. Boron uptake and allocation and cell wall pectin contents were examined. Results After 35 days under B deprivation, shoot dry mass in trifoliate orange decreased by 28 %, but shoot dry mass of citrange was not significantly affected. Root growth of both types of rootstock seedlings was inhibited, but the trifoliate orange was affected more than the citrange. In comparison with B concentrations in plants prior to the commencement of B treatments, B deprivation for 35 days decreased B concentration in various parts of citrange plants, and the reduction was much greater in trifoliate orange plants. Trifoliate orange seedlings contained higher B concentration and total B in cell wall on a dry leaf basis than citrange subject to 5 μM B treatment. However, the proportion of leaf B allocated in cell wall was higher in citrange than trifoliate orange when B supply was deficient in the nutrient. The changes in pectin composition in cell wall due to B deprivation differed between citrange and trifoliate orange. The decreased uronic acid (UA) content in the Na2CO3-soluble pectin was observed in both rootstock, but the increased UA content in CDTA-soluble pectin was observed only in citrange. Conclusions These results demonstrated that a combination of greater B uptake ability, greater B accumulation in cell walls, as well as the increased CDTA-soluble pectin, under limited external B supply, contribute to the integrity of cell walls in citrange and therefore increased tolerance to B deficiency.
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last="Liu">Gui-Dong Liu</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Microelement Research Center, College of Resources and Environment, Huazhong Agricultural University</s1><s2>Wuhan, Hubei Province 430070</s2><s3>CHN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>République populaire de Chine</country><wicri:noRegion>Wuhan, Hubei Province 430070</wicri:noRegion></affiliation></author><author><name sortKey="Wang, Rui Dong" sort="Wang, Rui Dong" uniqKey="Wang R" first="Rui-Dong" last="Wang">Rui-Dong Wang</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Microelement Research Center, College of Resources and Environment, Huazhong Agricultural University</s1><s2>Wuhan, Hubei Province 430070</s2><s3>CHN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>République populaire de Chine</country><wicri:noRegion>Wuhan, Hubei Province 430070</wicri:noRegion></affiliation></author><author><name sortKey="Liu, Lei Chao" sort="Liu, Lei Chao" uniqKey="Liu L" first="Lei-Chao" last="Liu">Lei-Chao Liu</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Microelement Research Center, College of Resources and Environment, Huazhong Agricultural University</s1><s2>Wuhan, Hubei Province 430070</s2><s3>CHN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 aut.</sZ></inist:fA14><country>République populaire de Chine</country><wicri:noRegion>Wuhan, Hubei Province 430070</wicri:noRegion></affiliation></author><author><name sortKey="Wu, Li Shu" sort="Wu, Li Shu" uniqKey="Wu L" first="Li-Shu" last="Wu">Li-Shu Wu</name><affiliation wicri:level="1"><inist:fA14 i1="01"><s1>Microelement Research Center, College of Resources and Environment, Huazhong Agricultural University</s1><s2>Wuhan, Hubei Province 430070</s2><s3>CHN</s3><sZ>1 aut.</sZ><sZ>2 aut.</sZ><sZ>3 aut.</sZ><sZ>4 aut.</sZ><sZ>5 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and soil</title><title level="j" type="abbreviated">Plant soil</title><idno type="ISSN">0032-079X</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Allocation</term><term>Boron</term><term>Cell wall</term><term>Citrus fruit</term><term>Deficiency</term><term>Efficiency</term><term>Pectin</term><term>Plant juvenile growth stage</term><term>Response</term><term>Rootstock</term><term>Rutaceae</term><term>Soil plant relation</term></keywords><keywords scheme="Pascal" xml:lang="fr"><term>Affectation</term><term>Porte greffe</term><term>Stade juvénile plante</term><term>Déficit</term><term>Réponse</term><term>Efficacité</term><term>Paroi cellulaire</term><term>Relation sol plante</term><term>Rutaceae</term><term>Agrume</term><term>Bore</term><term>Pectine</term></keywords><keywords scheme="Wicri" type="topic" xml:lang="fr"><term>Déficit</term><term>Agrume</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Aims Variation in boron (B) efficiency in citrus in different rootstock genotypes is expressed as large differences in the occurrence of leaf symptoms and dry mass production under low B conditions, but the mechanisms responsible for such differences are unknown. This paper aims to determine whether differences in B uptake, cellular B allocation, and pectin content can explain genotype differences in B efficiency between B-efficient citrange (Citrus sinensis (L.) Osb. x Poncirus trifoliata (L.) Raf.) and B-inefficient trifoliate orange (Poncirus trifoliata (L.) Raf.) citrus rootstock. Methods Plants were grown hydroponically in a nutrient solution supplemented with 5 μMB for 14 days and then transferred to a B-free medium (0 μMB) or control medium (5 μM B) for 35 days. Boron uptake and allocation and cell wall pectin contents were examined. Results After 35 days under B deprivation, shoot dry mass in trifoliate orange decreased by 28 %, but shoot dry mass of citrange was not significantly affected. Root growth of both types of rootstock seedlings was inhibited, but the trifoliate orange was affected more than the citrange. In comparison with B concentrations in plants prior to the commencement of B treatments, B deprivation for 35 days decreased B concentration in various parts of citrange plants, and the reduction was much greater in trifoliate orange plants. Trifoliate orange seedlings contained higher B concentration and total B in cell wall on a dry leaf basis than citrange subject to 5 μM B treatment. However, the proportion of leaf B allocated in cell wall was higher in citrange than trifoliate orange when B supply was deficient in the nutrient. The changes in pectin composition in cell wall due to B deprivation differed between citrange and trifoliate orange. The decreased uronic acid (UA) content in the Na<sub>2</sub>CO<sub>3</sub>-soluble pectin was observed in both rootstock, but the increased UA content in CDTA-soluble pectin was observed only in citrange. Conclusions These results demonstrated that a combination of greater B uptake ability, greater B accumulation in cell walls, as well as the increased CDTA-soluble pectin, under limited external B supply, contribute to the integrity of cell walls in citrange and therefore increased tolerance to B deficiency.</div></front></TEI><affiliations><list><country><li>République populaire de Chine</li></country></list><tree><country name="République populaire de Chine"><noRegion><name sortKey="Liu, Gui Dong" sort="Liu, Gui Dong" uniqKey="Liu G" first="Gui-Dong" last="Liu">Gui-Dong Liu</name></noRegion><name sortKey="Jiang, Cun Cang" sort="Jiang, Cun Cang" uniqKey="Jiang C" first="Cun-Cang" last="Jiang">Cun-Cang Jiang</name><name sortKey="Liu, Lei Chao" sort="Liu, Lei Chao" uniqKey="Liu L" first="Lei-Chao" last="Liu">Lei-Chao Liu</name><name sortKey="Wang, Rui Dong" sort="Wang, Rui Dong" uniqKey="Wang R" first="Rui-Dong" last="Wang">Rui-Dong Wang</name><name sortKey="Wu, Li Shu" sort="Wu, Li Shu" uniqKey="Wu L" first="Li-Shu" last="Wu">Li-Shu Wu</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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