BIOL 1050 Lecture Notes - Lecture 21: Striga, Pennisetum Purpureum, Diatraea Saccharalis

• School: University of Guelph
• Department: Biology
• Course: BIOL 1050
• Professor: Steve Bowley

Document Summary

Mutualistic: for plant: herbivore resistance (insect and animals) and stress tolerance, endophyte: a home, nutrients. Antagonistic association: causes poor production and reproduction in animals, stress. Parasitic weed acquires all or part of its nutrition form a host plant. Colonizes: corn, millets, rice, sorghum, and sugarcane. Only germinate after the receive a signal from another crop: attach to roots of other plants and break surface after other plants, so by the time you (cid:374)oti(cid:272)e the(cid:373) it"s too late. E(cid:374)ter roots of the (cid:272)rop a(cid:374)d su(cid:272)k up (cid:374)utrie(cid:374)ts a(cid:374)d (cid:449)ater a(cid:374)d grow underground for the first fe(cid:449) (cid:449)eeks, so the far(cid:373)ers do(cid:374)"t (cid:374)oti(cid:272)e the(cid:373) u(cid:374)til they"re do(cid:374)e (cid:449)eedi(cid:374)g a(cid:374)d it"s too late. Legu(cid:373)es se(cid:374)d out sig(cid:374)als for striga to ger(cid:373)i(cid:374)ate, (cid:271)ut they do(cid:374)"t allo(cid:449) the striga to pe(cid:374)etrate their roots, so without a host, striga dies. Stemborer reduces yields by 30 to 40: caterpillars eat leaves, then burrow into the stem and eat it, moth.