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The problems of producing hybrid brussels sprouts of uniform quality and high yield are examined.
Metadata describing this Open University video programme
Module code and title: S299, Genetics
Item code: S299; 12
First transmission date: 09-08-1976
Published: 1976
Rights Statement:
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Duration: 00:23:00
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Producer: Jean Nunn
Contributors: Denis Gartside; Harry Holland
Publisher: BBC Open University
Keyword(s): Brussel sprouts; Gel-electrophoresis; Inbreeding depression; Uniform hybrid; US maize industry
Footage description: Denis Gartside introduces the programme. Harry Holland, in a sprout field, points out the disadvantages of growing sprouts with a lot of variation within generations. He lists the qualities desired by the farmer and then briefly defines heterosis. Denis Gartside also points out the desirable qualities of sprouts from the farmer's viewpoint. He ends with a definition of heterosis. Film shots of American farmers harvesting maize as done at the turn of the century. Because of the variability of the crop, harvesting had to be done by hand. Gartside explains how the development of a uniform hybrid revolutionised the maize industry in the U.S. Using several animated block diagrams, Denis Gartside explains how a homozygous plant can be derived after several generations from heterozygous ancestors. Gartside goes on to describe the phenomenon of inbreeding depression. He explains how the problem was overcome by crossing inbred lines. Animated graph shows increase of maize yield in the U.S. between 193O and 1960 when these methods were applied. Film shots of brussels sprouts being harvested Denis Gartside (voice over) summarises the qualities of a good sprout hybrid. Harry Holland explains, in general terms how an F1 sprout hybrid is produced. Shots of several generations of sprouts showing marked inbreeding depression. Denis Gartside prepares a sample of the stigmatic surface of a sprout flower for the scanning electron microscope. The sample is viewed under the S.K.M. and shows pollen penetration of the stigma. These shots help explain the phenomenon of self-incompatibility. Harry Holland continues his discussion on methods by which the F1 hybrid sprout is produced. Film shots of a bud pollination demonstration while he talks. Shots of fifth generation parent plants for the F1 hybrid. Holland in a sprout field with F1 hybrid sprouts. He points out their desirable feature. Denis Gartside demonstrates a technique, gel electrophoresis, for determining the number of parental types in a batch of F1 seed. Harry Holland sums up. Shots of sprouts in a field.
Master spool number: 6HT/72084
Production number: 00525_1180
Videofinder number: 1001
Available to public: no