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Species of the Cruciferae family show seed measurement and color polymorphism similar to for Eruca sativa Mill. Bochenek etnbsp;al. [46] reported differences between the cultivars of Brassica napus L. Seed in their potential to exhibit secondary dormancy following environmental stress. A important variety of variations in gene expression between the cultivars were obvious within the transition from full-size embryo to mature seed. Authors suggested that the propensity of Brassica seeds to manifest secondary dormancy could additionally be decided by changes in gene expression that occur throughout late seed growth [47]. Other weed species exhibit polymorphism and produce morphologically and physiologically completely different seeds which have totally different after-ripening durations such as for seeds of Xanthium strumarium L.
It is outlined as the lack of seeds to germinate due to environmental elements. One or more components essential for germination are in a brief supply or absent including the lack of moisture, low temperature, lack or low oxygen degree, and poor aeration and unfavorable environment. When the external limitation is eliminated as seeds are dropped at the soil floor by tillage, they germinate. Sometimes this dormancy is due to placement of weed seed deeper than 5nbsp;cm in the soil by tillage. It results from the absence of red (r) light under the soil surface. Red light induces germination in seeds by activating their phytochrome system (P)-chromophore blue pigment attached to the protein molecule within the seeds.
Sowing depth is important for germination, and seedling emergence decreased with sowing depth. Bursa-pastoris germination and seedling emergence have been highest for seeds on the soil surface [38]. For occasion, deep tillage brings the seeds to the soil floor and thus would permit successful germination and institution.
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