Chapter 12 Techniques

Chapter 12 TechniquesGoalsYieldMaturityLodging ShatteringWinter Hardiness heaving or freezingPlant parts more tolerant? Leaves or flowers?Less water in cell, higher sugar, proteins protectedSSoil StressAluminiiumSalt Disease Race specific - single geneNon-Race specific field resistant (quantitative)Avoidance - earlyTechniques Used and notes to takeMeasurements vs. Visual ScalesInsectDiseasesProduct QualityCrossing and Selfing EmasculationPollinationField TechniqueReplications

Randomization

Border effects

Statistical AnalysisMeans = AveragesVariances = Genetics, Environment, Interactions

Significance : Statistical vs MeaningfulStatistical Significant : Chances of the differences are real vs due to chance.

.05 level of probability vs. .015 times in 100 that this level of difference is due to chance alone (95% chance it is real)1 times in 100 that this level of difference is due to chance alone (99% chance it is real).Setting the test level too high causes you to throw away right choices at a higher frequency.Correlations vs. RegressionCorrelation = What percentage of the variation of one variable (trait) can be explained by the other variable (trait).Regression = What percentage of the variation of one variable (trait) can be caused by another variable (trait).Yield Component CompensationX# of tillersY# of seeds per headZwt of seeds

Yield = X Y ZTime = fall seeded crops like wheat, wild riceX is in fall and early springY is at flowering timeZ is at filling time