During post‐embryonic development, plants establish multiple secondary growth axes by forming additional meristems. cell activity within the meristem WHAT IS A MERISTEM? Tunica-Corpus theory To elucidate how the apical … Apical cell theory (2). Atsmon D, Galun E. 1960. Redundant CUP-SHAPED COTYLEDON 1 (CUC1) and CUC2 as well as SHOOT MERISTEMLESS (STM) of Arabidopsis are required for shoot apical meristem formation and cotyledon separation. Genes required for proper SAM development have been identified in a variety of species through the isolation of mutants. Current Opinion in Plant Biology 9, 72–77. In Arabidopsis, usually a single axillary meristem initiates in the leaf axil even though there is developmental potential for formation of multiple branches. Axillary shoot apical meristems initiate post‐embryonically in the axils of leaves. Theories explaining the organization of Apical Meristem in Shoots. The shoot apical meristem (SAM) is a complex structure consisting of three distinct layers (denoted L1, L2 and L3) in the dicot (one of the two major groups of flowering plants) Arabidopsis thaliana. To elucidate how the apical region of the embryo is established, we investigated genetic interactions … Plants retain the ability to produce new organs throughout their life cycles. Redundant CUP-SHAPED COTYLEDON 1 (CUC1) and CUC2 as well as SHOOT MERISTEMLESS (STM) of Arabidopsis are required for shoot apical meristem formation and cotyledon separation. Genetic control of shoot organ boundaries. The shoot apical meristem and cotyledons of higher plants are established during embryogenesis in the apex. THE SHOOT APICAL MERISTEM (WONDERS OF THE SAM) ... WHAT IS A MERISTEM? Aida M, Tasaka M. 2006. Continuous root growth and development are sustained by the root apical meristem, a reservoir of undifferentiated cells that give rise to the adult root architecture. Shoot apical meristem and cotyledon formation during Arabidopsis embryogenesis: interaction among the CUP-SHAPED COTYLEDON and SHOOT MERISTEMLESS genes. Histogen theory (3). During embryogenesis, the primary apical‐basal growth axis is established by two groups of proliferative cells, the shoot and the root apical meristems, which give rise to the primary shoot and root. All SAMs have a number of basic characteristics in common (e.g., Lyndon 1998; Traas and Doonan 2001).One of the most prominent features is the presence of a surface layer, called the tunica (Fig. The tunica—itself often composed of several sublayers—covers the internal cells of the meristem, collectively called corpus.
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