No abstract

The effects of regenerant wastewater irrigation and high concentrations of Ca2+, K+, Mg2+, and Cl– on growth and ion uptake of nine species of landscape plants were studied. Significant differences in chloride tolerance were detected among the species. Generally, the species that had greater uptake of chloride grew less than species that took up less amounts of chloride. Lace fern (Athyrium filix-femina Roth.) had the highest tissue Cl concentration and was the most affected. Hydrangea (Hydrangea macrophylla Ser.) also had high tissue Cl concentration, but showed no growth reduction. Its tolerance was attributable to a high tissue Ca concentration. The data suggest that in the species tested, higher tissue Ca concentrations were positively correlated with plant tolerance to Cl. Overall, the Cl– concentration in the wastewater seems to be the factor most likely to create problems for the landscape plants. However, severe negative effects will probably be noticed only for very sensitive plant species, but it is important to determine this before applying regenerant irrigation water.

Starch gel electrophoresis was used to further extend the identification of Kentucky bluegrass cultivars. A total of 24 cultivars were examined for isoenzyme variation in esterase (EST), phosphoglucomutase (PGM), phosphoglucoisomerase (PGI), and glutamate‐oxaloacetate transaminase (GOT) using starch gel‐electrophoresis. Esterase and phosphoglucomutase patterns were varible among the 24 cultivars. ‘Baron’, ‘Fylking’, ‘Merion’, and ‘Newport’ were examined for isoenzyme pattern differences between seed and seedling materials. Differences of esterase isoenzyme patterns were found between the two kinds of tissues. Seeds of ‘Adelphi’ and ‘Glade’ harvested from different fields and years were examined for isoenzyme consistency and within seed lot variation. Variation within seed lots differed from seed lot to seed lot. If seedlings from a seed lot were mixed, a constant pattern of both EST and PGM isoenzyme systems was obtained for different seed lots of the same cultivar. Therefore the process of mixing seedlings allows the finger‐printing characterization for Kentucky bluegrass cultivars even if there is occasional segregation from sexual reproduction.

No abstract

No abstract