carrageenans, sulphated polysaccharides of red seaweeds, differentially affect arabidopsis thaliana resistance to trichoplusia ni (cabbage looper)卡拉胶、硫酸化多糖的红色海藻,不同影响拟南芥抗trichoplusia倪(卷心菜电影).pdf

Carrageenans, Sulphated Polysaccharides of Red Seaweeds, Differentially Affect Arabidopsis thaliana Resistance to Trichoplusia ni (Cabbage Looper) 1 2 3 3 1 Jatinder S. Sangha , Wajahatullah Khan , Xiuhong Ji , Junzeng Zhang , Aaron A. S. Mills , Alan T. 4 1 Critchley , Balakrishnan Prithiviraj * 1 Department of Environmental Sciences, Nova Scotia Agricultural College, Truro, Nova Scotia, Canada, 2 Department of Biochemistry, Genome Research Chair Unit, College of Science, King Saud University, Riyadh, Saudi Arabia, 3 Institute for Nutrisciences and Health, National Research Council of Canada, Charlottetown, Prince Edward Island, Canada, 4 Acadian Seaplants Limited, Dartmouth, Nova Scotia, Canada Abstract Carrageenans are a collective family of linear, sulphated galactans found in a number of commercially important species of marine red alga. These polysaccharides are known to elicit defense responses in plant and animals and possess anti-viral properties. We investigated the effect of foliar application of i-, k- and l-carrageenans (representing various levels of sulphation) on Arabidopsis thaliana in resistance to the generalist insect Trichoplusia ni (cabbage looper) which is known to cause serious economic losses in crop plants. Plants treated with i- and k-carrageenan showed reduced leaf damage, whereas those treated with l- carrageenan were similar to that of the control. In a no-choice test, larval weight was reduced by more than 20% in i- and k- carrageenan treatments, but unaffected by l-carrageenan. In multiple choice tests, carrageenan treated plants attracted fewer T. ni larvae by the fourth day following i