What's happening at IRRI
Tuesday, June 14, 2016, 01:15pm - 02:15pm
Lodging Resistance of Rice and its Component Traits
Dr. Suchit Shrestha
Crop Physiology Group
Abstract: Lodging is a weak point of most high-yielding varieties in high-input systems and high-density plant populations. Lodging begins locally on a plot and spreads to larger surfaces through a mechanical domino effect. Lodging causes direct yield losses due to grain filling impeded by reduced photosynthesis of the collapsed canopy, indirect yield losses caused by reduced grain recovery in mechanized harvesting systems, and grain quality problems caused by pathogens complexes benefiting from high humidity in the collapsed canopy. The best-performing crops are frequently affected by lodging because they are top-heavy. Lodging usually happens during grain filling and is associated with heavy panicles and several environmental factors (wind force, wetting of plants by rain, soft soil providing poor anchorage), crop management and nutritional factors such as high nitrogen inputs, close spacing resulting in weak stem, low silica availability, sheath blight, constitutive stem morphology (long internodes and thin stem wall), stem chemical composition (fiber, lignin, and nonstructural carbohydrate), and stem anatomy (sheath thickness, stem deformation, porosity and culm thickness). Lodging resistance consist of several component traits, some of which may have positive or negative trade-offs with yield potential. The contribution of these traits to effective lodging resistance under wet conditions and exposure to mechanical forces will be presented.
CESD Conference Rm 1, DL Umali Bldg.