Association of seed coat colour with germination of three wild mustard species with agronomic potential
Abstract
195 words
Seed dormancy and germination present significant challenges
when wild species are domesticated for cultivation and economic
exploitation. Wild plant species are generally characterized by
dormant seeds with variable germination widely spread over
time. The objective of this study was to evaluate influence of
colour selection on seed germination of wild mustard
(Brassicaceae) species that have been identified as wild edible
leafy vegetable in South Africa. Seed lots were separated by
colour and germinated after chilling and after-ripening for 6
months. The light seed lot of cultivar Kwayimba showed higher
germination percentage than the dark seed lot of the same
cultivar but colour selection did not improve the germination in
cultivars Isaha and Masihlalisane. The dark seed lot of
Kwayimba recorded the lowest germination percentage and
the slowest germination rate. Chilling improved the speed of
germination in wild mustards, but after-ripening had no effect.
Seed colour change in wild mustards intensifies after
physiological maturity and may be accompanied with weight
increase or not. The seed coat colour may not be a good
indication of the physiological status of the seed but together
with physiological tests (germination) can give insight on the quality of a seed lot.
Subjects
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