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Selection for reduced bolting susceptibility in beet and swedes and the influence of environmental factors on bolting

Kongelige Veterinaer- og Landbohojskole Arsskrift : 138-158
Selection for reduced bolting susceptibility in beet and swedes and the influence of environmental factors on bolting
The frequency of bolters increased from late June-Oct. The number of bolters appearing before Aug. 20th. showed close agreement with the number of flowering and seed-bearing bolters (Early Bolters) at the end of the season. High levels of N fertilizer and early applications resulted in considerably more bolters than low N levels and late applications. Marked differences in bolting susceptibility were found between plants grown from seed lots of the same variety but produced in different years. Seed produced and after-ripened in the field gave 2-19 times more bolters with normal sowing times than seed produced and after-ripened under greenhouse conditions. Seed after-ripened in the field gave 32-54% more bolters than corresponding seed after-ripened in a greenhouse. In general the environment under which the seed is produced is considered to have a greater effect on bolting susceptibility than post-harvest ripening conditions. Three generations of selection reduced bolting susceptibility by 88-98% relative to the original variety. It was possible to select individuals susceptible to bolting from a beet population using the rate of stem formation as a criterion. Selection for reduced bolting susceptibility did not result in decreased dry matter productivity.

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Accession: 006380635

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