By F. A. Hoekstra, W. F. Wolkers, J. Buitink, E. A. Golovina (auth.), R. H. Ellis, M. Black, A. J. Murdoch, T. D. Hong (eds.)
The 5th foreign Workshop on Seeds was once held on the college of studying, united kingdom, from 10 to fifteen September, 1995. a few 230 seed scientists, from quite a lot of disciplines (botanists, biochemists, ecologists, agriculturalists, foresters, and advertisement seedsmen), from 31 nations (Europe, the Americas, and Asia) participated within the workshop. various oral and poster displays was once made throughout the workshop and we're happy to put up such a lot of of them in those lawsuits. The papers herein are indexed by means of the classes during which they have been awarded yet, as is usually the case, many papers hide a broader variety of themes than the consultation titles indicate. For seed physiologists, ecologists, and technologists, this e-book collates a lot of the present learn on seeds.
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Extra info for Basic and Applied Aspects of Seed Biology: Proceedings of the Fifth International Workshop on Seeds, Reading, 1995
Priestley, DA. 1986. Seed Aging: Implicationsfor Seed Storage and Persistence in Soil. Ithaca and London: Comstock Publishing Associates. Priestley, DA and Bruinsma, l 1982. Physiologia Plantarum 56:303-311. A. and Wood, G. 1992. Qatar University Science Journal 12: 69-72. , Gusse, IF. D. 1988. Physiologia Plantarum 73: 85-91. Senaratna, T. D. 1983. Plant Physiology 72: 911-914. e. and Leopold, Ae. 1994. Physiologia Plantarum 90: 621-628. Terao, l, Piskula, M. and Yao, Q. 1994. Archives ofBiochemistry and Biophysics 308: 278-284.
1992a). When the band positions of the symmetric CH2 stretching vibration in FfIR spectra are plotted against temperature, the average phase transition temperature (Tm) of membranes in intact pollen can very dry anhydrobiotic pollen species have thus be determined. A number of / . been analysed and were found to have Tms that are approXImately 20--30°C higher than in the hydrated state (Hoekstra et al, 1992b, 1992c), which means that Tm is not fully suppressed. However, this increase of Tm with drying is much less than in isolated membranes (Fig.
Dry seed and pollen have considerable heat tolerance, which gradually declines with increasing moisture content (Barton, 1961; Ellis and Roberts, 1980; Marcucci et al, 1982; Wolkers and Hoekstra, submitted). From this heat tolerance it could also be inferred that the dry proteins inside are heat stable, thereby providing long term stability. Some enzymes retain activity for many decades, even long after the seed has lost its viability (priestley, 1986 and references therein). The cytosolic proteins in particular retain enzymic activity, even when they are stored dry after isolation from the seed (Priestley and Bruinsma, 1982).