By Ramin Yadegari, Robert B. Goldberg (auth.), Brian A. Larkins, Indra K. Vasil (eds.)
The beginnings of human civili zation could be traced again to the time , ne- ly 12 ,000 years in the past , while th e early people progressively ch anged from a lifetime of searching and accumulating foodstuff , to generating nutrients. This starting of pri- tive agriculture ensured a accountable offer of nutrients , and fostered the residing jointly of individuals in teams and the improvement of s o c i e ty. in the course of th is time, plant s e e ds have been famous a s a helpful s o ur c e of nutrition and food , and started for use for transforming into crops for meals. Ever s i n c e , plant seeds have performed an incredible function within the improvement of the human civilization . Even at the present time, s e e ds of some crop s p e c i e s , s uc h because the cereals and legume s, are the first s o u r c e of such a lot human nutrients , and the main commodity in foreign agriculture. due to their nice value as nutrients for human s and in overseas exchange , seeds were a favourite item of s t u d y by way of developmental biologists and physiologi sts , nutritionist s and chem i sts . A wealth of invaluable details i s to be had on th e biology of seed s .
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Additional info for Cellular and Molecular Biology of Plant Seed Development
1994). Disruptions in embryo proper morphogenesis, therefore, can induce an embryo-proper-like pathway in terminally-differentiated suspensor cells - a result first observed by the embryo-proper ablation experiments of Haccius more than 30 years ago (Haccius , 1963). The Arabidopsis twin mutant represents a striking example of the embryogenic potential of the suspensor region (Vernon and Meinke, 1994). twin causes subtle defects to occur in embryo-proper morphology, generates a second embryo within the seed from proliferating suspensor cells , and results in twin embryos that are connected by a suspensor cell bridge (Vernon and Meinke, 1994).
R. B. ]. Each tissue layer of the radial embryo-proper axis also has a distinct transcriptional program (Figure 1 and 2). Transcriptional activity within these layers , however, appears to be established in a territory-specific manner; that is, ground meristem cells within the equator region activate promoters distinct from those within ground meristem cells of the micropylar-region, and vice versa (Figure I and 2). Therefore, a radial pattern during the globularstage embryogenesis is composed of two elements-three concentric layers of cells (Figure 1), and a partially-overlapping ring of transcriptional-specific regulatory programs (depending on the position along the apical-basal axis) (Figure 2).
A recent analysis of the influence of auxin on the establishment of bilateral symmetry in the monocot wheat zygotic embryo supports this dual mode of auxin function. One locus of auxin synthesis is proposed to be located in the basal part of the embryo proper and generates two pathways of polar transport-a basipetal one towards the scutellum and a lateral pathway towards the site of future promeristem (Fischer and Neuhaus, 1995). B. , 1994). Belonging to a diverse class of plant glycoproteins and proteoglycans, AGPs occur both as membrane-associated and secreted components of many different cell types (Chasan, 1994; Kreuger and van Holst, 1996) .