Seed dormancy and control of germination in Sisymbrella dentata (L.) O.E. Schulz (Brassicaceae).

摘要: Seed germination responsiveness to environmental cues is crucial for plant species living in changeable habitats and can vary among populations within the same as a result of adaptation or modulation local climates. Here, we investigate response Sisymbrella dentata (L.) O.E. Schulz, an annual endemic Sicily Mediterranean Temporary Ponds (MTP), vulnerable ecosystem. Germination only two known populations, Gurrida Pantano, was assessed over broad range conditions understand role temperatures, nitrate, hormones (abscisic acid - ABA gibberellins GA) after-ripening dormancy release this species. varied between with seeds from germinating under narrower conditions. Overall, process S. consisted testa endosperm rupture sequential events, influenced by GA biosynthesis. Nitrate addition caused earlier rupture, broadened thermal that allow germination, alternating temperatures significantly promoted non-after-ripened seeds. Primary likely allows form persistent seed bank responsive specific characteristic MTP habitats.