Use this URL to cite or link to this record in EThOS:
Title: Interaction between Ca2+ and Mg2+ ions and tolerance to NaCl of Agrostis stolonifera ecotypes
Author: Seelig, C. I.
Awarding Body: University College of Swansea
Current Institution: Swansea University
Date of Award: 1991
Availability of Full Text:
Access from EThOS:
Two clones of Agrostis stolonifera, (salt tolerant and non tolerant) were assessed for responses to NaCl and MgCl2-stress. Elevated supplements of Ca2+ and M2+ were added to the growth medium in conjunction with the imposed stress, in order to ascertain any amelioration conferred by these ions. Whole plant and callus tissues were investigated. The effect of NaCl and MgCl2-stress on growth, ionic relations and accumulation of nitrogenous compounds, sugars and chlorophyll was investigated. The salt marsh clone was more tolerant than the inland towards NaCl and MgCl2. Under the imposed stresses the salt marsh clone exhibited greater growth rates and showed a comparatively greater ability to utilize Ca2+ and Mg2+ in an ameliorative capacity. Whole plant tissues showed significant loss of Mg2 (roots) and K+ (roots and shoots) in response to NaCl. Ca2+ and Mg2+ ameliorated this to some extent. Both clones exhibited enhanced proline and QAC accumulation in response to salinity, however, sugar and total α-amino and concentrations did not show this significant trend. Callus tissue responses showed a parallel with those of the whole plant, with respect to salinity induced reduction of growth rate, K^+ loss and proline accumulation. However, in contrast, NaCl and MgCl_2-stressed callus tissues accumulated increased concentrations of total sugars. Soil sample solutions from Llanrhidian Salt Marsh were analysed over a twelve month period and compared with the relevant climatological data. High Mg^2+, Ca^2+ and K^+ concentrations coincided with periods of low rainfall. High Cl^- and Na^+ concentrations correlated well with low rainfall and elevated ambient temperatures.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available