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    • Trenner 0
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Sreenivasulu, N.; Radchuk, V.; Alawady, A.; Borisjuk, L.; Weier, D.; Staroske, N.; Fuchs, J.; Miersch, O.; Strickert, M.; Usadel, B.; Wobus, U.; Grimm, B.; Weber, H.; Weschke, W.; De-regulation of abscisic acid contents causes abnormal endosperm development in the barley mutant seg8 Plant J. 64 589-603 (2010) DOI: 10.1111/j.1365-313X.2010.04350.x
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Grain development of the maternal effect shrunken endosperm mutant seg8 was analysed by comprehensive molecular, biochemical and histological methods. The most obvious finding was de‐regulation of ABA levels, which were lower compared to wild‐type during the pre‐storage phase but higher during the transition from cell division/differentiation to accumulation of storage products. Ploidy levels and ABA amounts were inversely correlated in the developing endosperms of both mutant and wild‐type, suggesting an influence of ABA on cell‐cycle regulation. The low ABA levels found in seg8 grains between anthesis and beginning endosperm cellularization may result from a gene dosage effect in the syncytial endosperm that causes impaired transfer of ABA synthesized in vegetative tissues into filial grain parts. Increased ABA levels during the transition phase are accompanied by higher chlorophyll and carotenoid/xanthophyll contents. The data suggest a disturbed ABA‐releasing biosynthetic pathway. This is indicated by up‐regulation of expression of the geranylgeranyl reductase (GGR) gene, which may be induced by ABA deficiency during the pre‐storage phase. Abnormal cellularization/differentiation of the developing seg8 endosperm and reduced accumulation of starch are phenotypic characteristics that reflect these disturbances. The present study did not reveal the primary gene defect causing the seg8 phenotype, but presents new insights into the maternal/filial relationships regulating barley endosperm development.

Publications

Sreenivasulu, N.; Radchuk, V.; Strickert, M.; Miersch, O.; Weschke, W.; Wobus, U.; Gene expression patterns reveal tissue-specific signaling networks controlling programmed cell death and ABA- regulated maturation in developing barley seeds Plant J. 47 310-327 (2006) DOI: 10.1111/j.1365-313X.2006.02789.x
  • Abstract
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Gene expression patterns covering over 10 000 seed‐expressed sequences were analyzed by macroarray technology in maternal tissue (mainly pericarp) and filial endosperm and embryo during barley seed development from anthesis until late maturation. Defined sets of genes showing distinct expression patterns characterized both tissue type and major developmental phases. The analysis focused on regulatory networks involved in programmed cell death (PCD) and abscisic acid (ABA)‐mediated maturation. These processes were similar in the different tissues, but typically involved the expression of alternative members of a common gene family. The analysis of co‐expressed gene sets and the identification of cis regulatory elements in orthologous rice gene ‘promoter’ regions suggest that PCD in the pericarp is mediated by distinct classes of proteases and is under the hormonal control of both jasmonic acid (JA) and ethylene via ethylene‐responsive element binding protein (EREBP) transcription factors (TFs). On the other hand, PCD in endosperm apparently involves only the ethylene pathway, but employs distinct gene family members from those active in the pericarp, and a different set of proteases and TFs. JA biosynthetic genes are hardly activated. Accordingly, JA levels are high in the pericarp but low in the endosperm during middle and late developmental stages. Similarly, genes acting in the deduced ABA biosynthetic pathway and signaling network differ between endosperm and embryo. ABA in the endosperm appears to exert an influence over storage product synthesis via SNF1 kinase. In the embryo, ABA seems to influence the acquisition of desiccation tolerance via ABA response element binding factors, but the data also suggest the existence of an ABA‐independent but interactive pathway acting via the dehydration‐responsive element binding (DREB) 2A TF.

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