Rapid production of fertile transgenic plants of rye (Secale cereale L.)

6 Pags.We have produced transgenic rye plants by the direct delivery of plasmid DNA, containing the uidA and bar genes, into young embryogenic calli using high velocity microprojectiles. Of the fourteen independent callus lines selected on varying concentrations of phosphinothricin (PPT), the active ingredient of the herbicide Basta, six showed phosphinothricin acetyltransferase (PAT) activity. Plants (R0) were regenerated from two putative transformed lines on medium containing Basta. All of the R0 plants recovered from the two lines showed GUS expression (in leaves, roots, pistils and pollen), PAT activity and resistance to topical application of Basta. The presence of the uidA and bar genes and their integration into nuclear DNA in transformed R0 plants and their R1 progeny was confirmed by Southern analysis. Flowering fertile R0 plants were obtained 8–9 months after the initial culture and bombardment. Male and female transmission of the two genes, which segregated as dominant Mendelian traits in R1 plants, was demonstrated.Peer reviewe

Plant biotechnology 2002 and beyond : proceedings of the 10th IAPTC&B Congress, June 23-28, 2002, Orlando, Florida, U.S.A. /

Includes bibliographical references and index

The molecular biology of plant mithochondria

Bibl. : 661-664Indexix, 672 hlm. : il. ; 24 cm

Herbicide resistant fertile transgenic wheat plants obtained by microprojectile bombardment of regenerable embryogenic callus

8 Pags.We have obtained fertile transgenic wheat plants resistant to the broad spectrum herbicide Basta® (active ingredient phosphinothricin, PPT) by high velocity microprojectile bombardment. The plasmid pBARGUS was used to deliver the selectable bar gene into cells of Type C long–term regenerable embryogenic callus. Phosphinothricin acetyltransferase (PAT) enzyme activity encoded by the bar gene was demonstrated in four independent putative transformed callus lines selected on Basta® from two cultivars. Although somatic embryos and shoots were formed in each of the four lines, plants were recovered only from two. More than 100 green R0 plants were regenerated from the first callus line, of which 40 were grown to maturity. PAT activity was shown in each of the 28 R0 plants tested. Southern analyses confirmed the presence of the bar gene in all of the callus lines, and in each of the R0 and two of the four R1 plants tested. Transformed R0, R1 and R2 plants were resistant to topical applications of Basta®, and the bar gene segregated as a dominant Mendelian trait in R1 and R2 plants.Peer reviewe