Words similar to midrib
Example sentences for: midrib
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While comparisons between a wild type and a mutant that has been subjected to six or seven backcrosses are generally considered acceptable, there is still a small risk of linkage drag, creating the possibility that genes linked to the brown midrib genes are affecting the development.
Maize and sorghum diverged approximately 15-20 million years ago and are considered closely related [ 18 ] . This is reflected by the degree of synteny between maize and sorghum [ 19 ] and the high degree of DNA sequence homology of coding regions between the two species [ 20 ] . In addition, brown midrib mutants exist in sorghum [ 21 ] , making a study on the relationship between cell wall composition of sorghum and flowering directly comparable to the maize study.
The maize brown midrib mutants have a reduction in lignin content and an altered lignin subunit composition [ 13 ] . Lignin is a complex hydrophobic polymer made of substituted p -hydroxy-cinnamyl alcohol units that differ in their extent of hydroxylation and methoxylation (for recent reviews see [ 14 15 ] ). Lignin is important for the transport of water and plant rigidity and it serves as a defense mechanism against pests and pathogens.
The present study also confirms the role that the maize brown midrib genes play in flowering dynamics.
The sorghum brown midrib (bmr) mutants, generated via chemical mutagenesis with di-ethyl sulfate (DES), are similar to the bm mutants of maize in that they have brown vascular tissue in the leaves and stem.
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