Stem Cell Research and Regenerative Medicine

Seedling Emergence Best Online Journals

Seed emergence can be predicted at optimal soil moisture conditions by means of a heat sum in degree days and a minimum temperature for germination in °C. The germination process begins when water is taken in (imbibed) by the seed. This initiates several biochemical events necessary for seedling development. For example, enzymes secreted from the aleuronic layer, break down carbohydrate in the endosperm converting it to simple sugars which nourish the embryo. All structural components of the grass seedling arise from the embryo. The endosperm provides a quick source of energy for the developmental process, whereas the cotyledon (rich in fats and oils) provides energy for later stages of development. In desert surroundings, plant survival is strongly limited by materialistic changes in water availability. Compared with mature plants, seedlings are more likely to suffer from water deficiency because their short roots are distributed only in dry hollow soil layers. Since seed germination determines when and where seedling growth begins, the success of seedling formation depends greatly on seed germination responses to the climate. This is in contrast to many other deserts, in which different annuals appear in winter and summer. Precipitation is highest in summer due to a continental monsoon , especially in middle to eastern parts of the desert regions in China.     

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