Molecular Biology of Lignification in Grasses - Botanical Research - page 86

TABLE I (continued )

Name of mutants/
genetic modification

Lignin content a Unit content a,b Gene targets Species Other phenotypes References

Sorghum bm12 and bm18/SNP-

indel

Reduced G ¼ ;S < ; 5-OH-

G > ; pCA <

- Brown-midrib phenotype
- Higher enzymatic
digestibility

Palmer et al.
(2008)

Ryegrass RNAi Reduced ( 16%) G ¼ ;S < ; 5-OH - Brown-midrib phenotype

- Higher enzymatic
digestibility

Tu et al. (2010)

G >

Tall fescue COMT/S-RNA (co-

suppression)

Reduced ( 5%) G ¼ ;S < ;H < - Higher enzymatic

digestibility

Chen et al. (2004)

Brachypodium 5139/SNP-indel Reduced ( 20%) G ;S ; 5-OH - No visual phenotype

- Higher enzymatic solubility

Sibout,
unpublished
data c

> <

G ; pCA ;

> <

FA

¼

CAD Maize bm1/SNP-indel Reduced S < ;G < ; aldh > ;

pCA < ;FA <

- Brown-midrib phenotype
- Higher enzymatic solubility

Barri`re et al.
(2004a,b,c)

Tall fescue CAD-AS-RNA

( þ cosuppression)

Reduced ( 15%) H > ;S < ;G < ;

aldh >

- No visual phenotype.
- Higher enzymatic solubility

Chen et al. (2003)

Sorghum bm6/SNP-indel Reduced ( 22%) S < ;G < ; aldh > ;

pCA <

- Higher enzymatic solubility Pillonel et al.
(1991) ; Palmer
et al. (2008)
Saballos et al.
(2009)

Rice gh2/SNP-indel Reduced ( 6%) G < ;S < ;H < - Reddish-brown panicles,

internodes and seeds

Zhang et al. (2006)

Rice fc1/T-DNA insertion

(enhancer trap line)

Reduced ( 20%) G < ;S < ;H < - Delay in development,

plant height < , fertility < ,
grain weight <
- No brown-midrib
phenotype

Li et al. (2009)