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why is the root length of standard brassica rapa shorter than the root length of tall...

why is the root length of standard brassica rapa shorter than the root length of tall brassica rapa, both under field conditions? Please explain any genotype and phenotype relationship involved thoroughly on one-page length.

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According to research, seed size is directly proportional to the root length in brassica rapa. Greater the diameter of the seed makes lengthier root. The seed sizes also influence the demand of nutrients, which are essential to growing long roots. This trait is maternally influenced. Therefore genotypes related to seed size are responsible for the root length variations in brassica rapa.

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