Effects of dormancy breaking methods on germination of Cercis siliquastrum and Spartium junceum and seedling growth

Abstract

Seed dormancy is a mechanism of long survival that is ecologically important for seed propagation and dispersal and the expansion of plant populations. The impermeability of the seed coat in the Fabaceae family is due to a layer of sclerotic cells. Two experiments were conducted to investigate the effect of different seed treatment on germination parameters and seedling growth in Cercis siliquastrum and Spartium junceum. Experimental treatments comprised of chemical and thermal scarification treatment consisting of boiling water (2, 5, 10 min), H2SO4 (30, 60 min) and GA (0, 500 and 1,000 mg L−1) in C. siliquastrum and boiling water (2, 5, 10 min), H2SO4 (2, 5 min) in S. junceum. The results presented here indicate that chemical scarification by soaking in sulfuric acid for 30 min and 2 min in C. siliquastrum and S. junceum, respectively were the most efficient methods to breaking the seed dormancy. The application of these methods promoted the highest values of indices seedlings. In the light of the found results, it revealed that C. siliquastrum and S. junceum seeds are affected by a coat dormancy, which can be removed by a chemical-thermal scarification with sulfuric acid and boiling water. The data obtained contribute to a better comprehension of propagation and establishment of these shrubs ornamental by seedling.

Seed dormancy mechanism and dormancy-breaking methods in wild raspberry (Rubus fraxinifolius Poir.)

“…Yuniarti and Djaman (2015) reported that H2SO4 could increase imbibition rate by releasing hydrophilic colloids, removing the waxy layer on the seed coat and making it permeable to gas and water. H2SO4 treatment will damage the cell lining of the macrosclereid lumens resulting in water imbibition and the release of simple sugars for protein synthesis, which promotes germination (Taghizadeh and Sajadi, 2023).…”

Métodos alternativos na superação da dormência de sementes de Senegalia polyphylla (DC.) Britton & Rose para conservação e restauração ecológica

“…Diferentes métodos foram testados para superar a dormência, como os tratamentos químicos (ácido sulfúrico) e a água fervente, que se mostraram eficazes para superar a dormência de sementes em várias espécies (TAGHIZADEH, 2023;LIYANAGE et al, 2022), além da escarificação mecânica e variação de temperatura e luz. Estudos têm demonstrado que diferentes tratamentos têm efeitos variados na porcentagem de germinação e nos parâmetros de crescimento das plântulas (MURTIĆ, 2023; NAUTIYAL; SIVASUBRAMANIAM; DADLANI 2023).…”