): First results on synchrony between seasonal pattern of pheromone trap captures of cotton bollworm,
and appearance of freshly emerged larvae on developing cobs of cornhybrids. J. of Pest Science 80, 183
Authors:O. Bilgin, H. Orak, K. Korkut, İ. Başer, A. Orak, and A. Balkan
The interrelationships among the grain protein, oil, fatty acids, starch, Na, K, Fe concentrations and chemical grain characteristics were determined by correlation analyses in thirty-five commercial dent corn hybrids. An increase in oil content of the corn is accompanied by a decrease in starch content and by an increase in caproic acid content. The correlation coefficients involving protein content of corn hybrids with oil content (
= 0.066) and with saturated fatty acid (SFA) (
= −0.247*) evidence that protein content is more related to fatty acid distribution than the oil quantity. Linear relationships between refractive index (RI) (nD40 °C) and saturated fatty acid (
= 0.369**) and between refractive index and oleic acid (
= 0.364**), and between iodine number (IN) and unsaturated fatty acid (UFA) were determined. In addition, oleic acid is strongly correlated with linoleic (
= −0.769**) and linolenic acids (
Cornmeal agar (CMA) is a good to model natural conditions (low C and N, high antioxidants, crude fat) for phytopathogenic fungi. Different CMA media was prepared to model the maize kernel as growth environment for Aspergillus flavus, where stress resistance and aflatoxin B1 (AFB1) production were tested. The CMA medium with high polyphenol and low fatty acid content did not support the mycelial growth and high AFB1 production but the sclerotia development of the cultures. High fatty acid content in the CMA exceeded the inhibitory effect of antioxidant polyphenols of corn and low concentration of AFB1 was detected. Glucose supplement of CMA induced AFB1 production proving the need for free carbon source for the secondary metabolite pathway. The tolerance of the fungus against salt and cell membrane stress was lowered on CMA. At higher fatty acid concentration, the aflatoxin B1 production cannot be hindered by the natural antioxidants and that is important in selection of resistant corn hybrids.
Authors:Gert Daniel, Alfred Baumann, and Sabine Schmucker
The effect of colchicine enriched culture media on embryo regeneration and the production of doubled haploid wheat plants
were examined using two regeneration media enriched with 300 and 900 mg/ colchicine respectively and the results were compared with results from plants treated with colchicine after regeneration. Four German winter wheat varieties were pollinated with a pollen mixture collected from two sweet corn hybrids. The number of pollinated florets, caryopses, haploid embryos and regenerated plantlets were scored. In total 14,000 pollinated wheat florets produced 10,879 caryopses from which 2,704 embryos were excised; 1,288 embryos regenerated to plants and 958 plants survived till maturity. The regeneration of embryos to plants was influenced by the wheat varieties, the colchicine treatment and colchicine concentration. The percentage of doubled haploid plants varied depending on chromosome doubling technique, colchicine concentration and wheat variety. Plants were cultured till ripening and those with seed set were scored as doubled haploid plants. The highest percentage of doubled haploids per 100 cultivated embryos across the four varieties were scored for plants regenerated on colchicine free medium and treated thereafter
with colchicine (30.6 %), followed by plants regenerated on medium enriched with 300 mg/l colchicine (19.9 %) and 900 mg/l colchicine (18.4 %).
Authors:I. Bauer, S. Mladenovic Drinic, G. Drinić, and D. Ignjatović Micić
.S.C., Cooper, M. 2004. Changes in performance, parentage and genetic diversity of successful cornhybrids, 1930–2000. In: Smith, C.W., Betran, J., Runge, E.C.A. (eds), Corn: Origin, History, Technology and Production. Wiley, New York, pp. 65