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Title: Genetics of reproductive development and reproductive strategies in the Andean grain crop quinoa (Chenopodium quinoa Willd.)
Author: Fleming, Joyce Elizabeth
Awarding Body: University of Cambridge
Current Institution: University of Cambridge
Date of Award: 1993
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Quinoa is a grain crop of Andean origin which is receiving increasing attention outside South America owing to its good nutritional qualities and potential industrial value. There has been considerable success in developing the crop for British agricultural conditions and lines based on Chilean germplasm are currently being registered as commercial varieties. However, the seed of these lines is small and buff-coloured with a high saponin content. Better seed characteristics are present in genotypes from Ecuador, Peru and Bolivia. Use of such genotypes in crossing programmes, however, may introduce unacceptable levels of photoperiod sensitivity and late maturity into the locally-adapted crop. Assessment of the importance of sensitivity to photoperiod and other environmental variables is thus necessary for defining strategies for adaptation of the crop to new environments. The research presented here was directed towards gaining a fuller understanding of the genetic and environmental control of development in quinoa. Temperature, photoperiod, nutritional status and competition were identified as environmental variables which affect the progress of development, and their effects on a range of genotypes were examined. Genotypes were found to vary in developmental patterns and in the magnitude of their sensitivity to temperature and photoperiod. These variables also affected relationships between growth and developmental characters. Geographical trends were observed in the variation and photoperiod sensitivity was shown to be partially distributed according to latitude of origin. The timing of photoperiod-sensitive responses was found to vary according to genotype, temperature and developmental stage. The assumption that locally-adapted genotypes were insensitive to photoperiod was shown to be unfounded. The F2 progeny from a crossing programme between locally-adapted and exotic genotypes were analysed to assess the impact of introducing exotic germplasm into the locally-adapted crop. All crosses expressed photoperiod sensitivity, but the variation between crosses was largely additive in nature, facilitating the task of re-selecting for developmental adaptation to British growing conditions.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available