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

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

Kongelige Veterinaer- og Landbohojskole Arsskrift : 138-158

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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