Seed banks are a common characteristics to many plant species, 1 which allow storage of genetic diversity in the soil as dormant seeds for various 2 periods of time. We investigate an above-ground population following a Fisher3 Wright model with selection coupled with a deterministic seed bank assuming 4 the length of the seed bank is kept constant and the number of seeds is large. 5 To assess ...

Protein synthesis in gibberellin-treated lettuce (Lactuca sativa) seeds has been studied during the lag phase between the beginning of imbibition and the first signs of radicle protrusion. When compared to the water-imbibed controls, both polyribosome populations and radioactive leucine incorporation into protein increase in the embryos of GA(3)- induced seeds early in the imbibition period. Si...

After imbibition of water by seeds under favorable circumstances, the growth by which the embryo becomes a young seedling occurs by both expansion of cells originally present in the dormant embryo and mitotic divisions resulting in an increase in cell number (15). Germination of lettuce seed has been of special interest to plant physiologists because it can be stimulated by gibberellins, kineti...

Seed germination and early seedling growth are critical phases in the plant life cycle (Bewley and Black, 1994). Young seedlings need to grow rapidly in order to effectively compete with neighbours, yet young seedlings have limited nutrient reserves to draw on as they resume growth. Root systems are rudimentary, and this limits the ability of young seedlings to explore the environment for water...

BACKGROUND AND AIMS Lomatium dissectum (Apiaceae) is a perennial, herbaceous plant of wide distribution in Western North America. At the time of dispersal, L. dissectum seeds are dormant and have under-developed embryos. The aims of this work were to determine the requirements for dormancy break and germination, to characterize the type of seed dormancy, and to determine the effect of dehydrati...

Germination inhibitors, which inhibit the germination of seeds, spores and other plant reproductive material, are abundant in kingdom include phenols, cyanides, alkaloids, essential oils, amino acids, etc. These inhibitors can be classified as destructors retarders depending on whether they harm morphology, structure physiology seed. closely related to seed dormancy, exogenous used extend “dorm...

Seed dormancy prevents an intact, viable seed from successfully germinating under ideal circumstances. In order for germination to occur when conditions are likely be favourable forming a new plant generation, this barrier has developed differently among species through adaptation the local environment. Although there is still gap between biochemistry and morphogenesis, it being bridged in many...

Allen P.S., Meyer S.E., Beckstead J. (2013): A predictive model for soil seed bank outcomes in the Pyrenophora semeniperda–Bromus tectorum pathosystem. Plant Protect. Sci., 49 (Special Issue): S21–S24. Pyrenophora semeniperda is abundant in soil seed banks of Bromus tectorum, where it kills a fraction of seeds throughout the year. The pathogen engages in a race with host seeds for endosperm res...