Effect of Water, Salinity Stress with Varying Temperature Regimes on Seed Germination and Early Seedling growth of Holoptelia integrifolia (Roxb.) Planchon

摘要

Effect of different levels of water stress, salinity stress and various temperature regimes on seed germination and early seedling growth has been studied under laboratory conditions. Significant and marked reduction was observed in rate, cumulative and total germination along with radicle and plumule growth beyond 0.4 MPa and 0.08 M levels of water and salinity stress respectively. More reduction was noticed in germination rate compared to total germination in two experiments. Germination index (GI)decreased while mean germination time (MGT) increased with increasing stress. However, increasing temperature resulted in faster and higher germination percentage along with increasing radicle and plumule length. Increasing temperature enhanced GI and reduced MGT. These findings suggested that seed germination in Holoptelia integrifolia was not only governed by moisture availability but temperature also plays equal role in inducing optimum germination.