参考文献:Cohen JI, Williams JT, Plucknett DL, Shands H (1991) Ex situ conservation of plant genetic resources: global development and environmental concerns. Science 253:866-72PubMed View Article Ford-Lloyd BV, Williams JT (1975) A revision of Beta Section Vulgares (Chenopodiaceae), with new light on the origin of cultivated beets. Bot J Linn Soc 71:89-02View Article Frankel OH, Bennett E (eds) (1970) Genetic Resources in Plants -their Exploration and Conservation. IBP Handbook No 11. Blackwell Scientific Publications, Oxford and Edinburgh Harper JL, Williams JT, Sagar GR (1965) The behaviour of seed in soil. 1. The heterogeneity of soil surfaces and its role in determining the establishment of plants from seed. J Ecol 53:273-86View Article Holden JHW, Williams JT (eds) (1984) Crop genetic resources: conservation and evaluation. George Allen & Unwin, London IBPGR (1990) Annual report 1990. Italy, Rome Ingram GB, Williams JT (1984) In situ conservation of wild relatives of crops. In: Holden JHW, Williams JT (eds) Crop genetic resources: conservation and evaluation. George Allen & Unwin, London, pp 163-79 Maxted N, Hawkes JG, Ford-Lloyd BV, Williams JT (1997) A practical model for in situ genetic conservation. In: Maxted N, Ford-Lloyd BV, Hawkes JG (eds) Plant genetic conservation—the In Situ Approach. Chapman & Hall, London, pp 339-67View Article Padulosi S, Hodgkin T, Williams JT, Haq N (2002) Underutilized crops: trends, challenges and opportunities in the 21st century. In: Engels JMM, Rao VR, Brown AHD, Jackson MT (eds) Managing plant genetic diversity. CABI, Wallingford, Oxon, pp 323-38 Plucknett DL, Smith NJH, Williams JT, Anishetty NM (1983) Crop germplasm conservation and developing countries. Science 220:163-69PubMed View Article Plucknett DL, Smith NJH, Williams JT, Anishetty NM (1987) Genebanks and the World’s Food. Princeton University Press, Princeton Rao AN, Ramanatha Rao V, Williams JT (eds) (1998) Priority species of bamboo and rattan. IPGRI and INBAR, IPGRI-APO, Serdang, Malaysia Sidibe M, Williams JT (2002) Baobab, Adansonia digitata. International Centre for Underutilized Crops, Southampton, UK Smith NJH, Williams JT, Plucknett DL, Talbot JP (1992) Tropical forests and their crops. Comstock Publishing Associates (Cornell University Press), Ithaca and London Williams JT (1962) Studies on the biology of weeds with special reference to the genus Chenopodium L. PhD thesis, University of Wales Williams JT (1968) The nitrogen relations and other ecological investigations on wet fertilized meadows. Diss. Naturwiss, ETH Zurich Williams JT (1988) Identifying and protecting the origins of our food plants. In: Wilson EO (ed) Biodiversity. National Academy Press, Washington, DC, pp 240-47 Williams JT (1990) The implications of climatic changes for plant genetic conservation strategies. In: Jackson M, Ford-Lloyd BV, Parry ML (eds) Climatic change and plant genetic resources. Belhaven Press, London and New York, pp 167-78 Williams JT (1991) Plant genetic resources: some new directions. Adv Agron 45:61-1View Article Williams JT (1993) In review: genetics and conservation of rare plants. Diversity 9(1&2):84 Williams JT (1995a) Mediterranean genetic resources and the human perspective: past and present. Diversity 11(1&2):ii–iii Williams JT (ed) (1995b) Cereals and Pseudocereals. Chapman and Hall, London Williams JT, Ford Lloyd BV (1974) The systematics of the Chenopodiaceae. Taxon 23:353-54View Article Williams JT, Haq N (2002) Global research on underutilized crops. An assessment of current activities and prospects for enhanced cooperation, International Centre for Underutilized Crops, Southampton Withers LA, Williams JT (eds) (1982) Crop genetic resources—the conservation of difficult material. IUBS/IBPGR, Paris