Genetic foci of Solanum species, Petota Dumort, resistant to Phytophthora infestans (Mont.) De Bary

The present paper provides a review of data from literature sources and results of research carried out at the Institute of PlantIndustry with the aim of identifying genetic centres of formation of late blight resistant genotypes. For the research results, speciesfrom the potato collection of VIR were used.     

Residues of endosulfan in the tissues of lactating goats

SUMMARY: The sites of tissue accumulation in lactating goats of the organochlorine insecticide endosulfan were studied. Twelve lactating goats were dosed orally with endosulfan (1 mg/kg body weight per day) for 28 days. Groups of 3 animals were killed on days 1, 8, 15, and 21 after endosulfan treatment ended and their tissues examined for the presence of endosulfan. Total residues of α and β endosulfan and endosulfan sulphate (mg/kg) were detected in kidney (0.29), gastro-intestinal tract (0.20), liver (0.12), brain (0.06), muscle and spleen (0.04), lung and heart (0.01) and milk (0.02) on the flrst sampllng day but within 15 days, concentrations had fallen to < 0.01 mg/kg in all tissues except kidney (0.20). Endosulfan could not be detected in animals 21 days after dosing had ceased. The residue in milk could only be detected on day 1 of sampling. This study indicates that kidney rather than fatty tissue should be used to monitor the presence of endosulfan in animals intended for human consumption.     

The Effect of Soil pH and Manganese Toxicity Upon the Growth and Mineral Composition of the Hop Plant

Summary

The productivity of ornamental foliage plants is related to their capacity to increase their leaf number and leaf size. In Monstera deliciosa, a change in leaf shape is also a pre-requisite for successful marketing. The aim of this work was to describe the effects of different concentrations of exogenous 6-benzylaminopurine (BAP; 5, 50, 100, or 200 mg l^–1) on the control of both leaf size and leaf shape in M. deliciosa, and the impact of these changes on commercial plant productivity. We found an increase of between 15.4 – 23.1% in the rate of leaf appearance (RLA), which reflected a shortening of the phyllochron, and an increase of between 17.5 – 34.9% in the relative rate of leaf area expansion (RLAE) at most of the BAP concentrations tested. This resulted in higher biomass accumulation in both roots and shoots through an increase of between 5.4 – 7.9% in the relative growth rate (RGR), mainly associated with higher net assimilation rates (NAR; increases from 9.0-fold to 11.0-fold) and increased photoassimilate partitioning to the shoots. The most important result of this work was the early appearance of perforated leaf laminae in M. deliciosa plants sprayed with 50 – 200 mg l^–1 BAP, which made them ready for sale.