Tuesday, November 6, 2007
169-12

Potential Cultivation and Seed Production Aspects of Coastal Plant Smooth Cordgrass (Spartina alterniflora).

Herry Utomo1, Michael D. Materne2, Stephen Harrison1, Ida Wenefrida3, and Jennifer L. Nash3. (1) Louisiana State University - Agronomy & Environmental Management, Rice Research Station LSU Agric. Center, 1373 Caffey Rd., Rayne, LA 70578, (2) Agronomy and Environmental sciences, Louisiana State University, Baton Rouge, LA 70803, (3) Rice Research Station, Louisiana State University Agricultural Center, 1373 Caffey Road, Rayne, LA 70578

Aerial seeding of smooth cordgrass can be used for a large scale coastal marsh restoration and erosion control. Capable of reaching marsh interiors most affected by erosion, the aerial seeding can deliver coastal plant materials to these sites not only to restore coastal marshes but also maintain Louisiana saltmarsh systems. Current planting practices in restoration projects are both labor-intensive and costly. It is mostly carried out through manual transplanting of sprigs, plugs, or potted saltmarsh plants. The seed-based propagation technique will only require a fraction of the cost; with aerial seeding, hundreds of acres can potentially be planted in a day. Though the general requirement for cultivating smooth cordgrass is similar to the rice crop, harvest, seed storage and handling are different. Smooth cordgrass is a largely open-pollinated plant. It is protogynously flowering plant with stigmas extrude prior to anther dehiscence. Pollinated flowers developed into seed, but the seed does not mature at the same time. Once seeds mature, they shatter. Panicles can be harvested prior to maturity and stored in room temperature in plastic bags that provide 100% humidity for approximately one month to allow all seed to mature and obtain maximum harvest. Smooth cordgrass seed exhibits dormancy. A cold stratification of 2 to 3oC under 100% humidity for a month is required to break the dormancy. Smooth cordgrass seed shows unorthodox traits. Long-term storage of smooth cordgrass is challenging. The seed cannot be maintained in a desiccated condition for a prolonged period of time. Following the cold stratification, the seed remains viable for six months under cool and humid conditions, but its viability becomes rapidly deteriorated thereafter.