Theses and Dissertations

Issuing Body

Mississippi State University


Tseng, Te-Ming

Committee Member

Peng, Zhaohua

Committee Member

Reynolds, Daniel B.

Committee Member

Burgos, Nilda Roma

Date of Degree


Document Type

Graduate Thesis - Open Access


Plant and Soil Sciences (Weed Science)

Degree Name

Master of Science (M.S.)


College of Agriculture and Life Sciences


Department of Plant and Soil Sciences


Weedy red rice is conspecific weed of rice, identified as a threat to global rice production. As weedy rice is more tolerant to stresses than cultivated rice and has wide genetic and morphological variation we hypothesized that weedy rice has high herbicide tolerance and weed suppressive potential. Herbicide tolerance and weed suppressive potential of 54 weedy rice accessions were evaluated and the traits were associated with molecular markers. Accessions B2, B20 and S11 showed high tolerance to glyphosate and B49, B51 and S59 had high tolerance to flumioxazin. All the accessions were controlled 100% with 1311g a.i/ha (1.5x) rate of glufosinate. Accession B2 inhibited the growth of barnyardgrass and amazon sprangletop by more than 50% indicating its high weed suppressive potential. Nei’s gene diversity and Shannon’s information index among the weedy rice accessions were found to be 0.45 and 0.66 respectively indicating high genetic diversity among weedy rice accessions.