1: Chapters
- Page ID
- 121724
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)- 1: Plant Breeders Rise to the Challenge of Feeding the World
- This page details the importance of plant breeding for improving crop traits and yields, especially maize in the USA, but highlights that current yield increases are inadequate for future population demands. It discusses the complexities of cultivar development, including genetic gain factors and multidisciplinary collaboration, and outlines various cultivar types.
- 2: The Process of Cultivar Development- Pure Line Variety
- This page outlines the cultivar development process for pure line varieties, focusing on parent selection for desirable traits and genetic diversity. It discusses methods like EBV, BLUP, and genomic selection to enhance breeding, along with techniques for trait evaluation such as tandem selection and the Smith-Hazel Index. The importance of environmental management and GxE stability in breeding trials is emphasized, advocating for extensive testing to ensure consistent cultivar performance.
- 3: New Line Development and New Line Evaluation- Single-cross Hybrid
- This page focuses on the development and breeding of hybrid maize cultivars, emphasizing the importance of heterosis and the establishment of heterotic groups for enhanced performance. It discusses techniques in breeding, including recurrent selection methods and tester seed evaluation to improve hybrid populations.
- 4: New Line Development and New Line Evaluation- Clonally Propagated Cultivars
- This page explores the development of clonally propagated crops, notably potatoes, focusing on asexual reproduction, genetic variation, and breeding challenges. It introduces the GxExM concept for understanding environmental influences on crop performance. Additionally, it details methods for breeding and testing potato cultivars through experimental designs and an 11-step breeding program that emphasizes farmer involvement and disease-free propagation of new varieties.
- 5: Value-added Trait Integration
- This page focuses on value-added trait integration (VAT integration) in cultivar development to enhance the value of elite cultivars for farmers and consumers, featuring genetic techniques like mutagenesis and gene editing. It includes examples such as SmartStax® corn and discusses the significance of regulations in GM crop adoption. Key strategies involve using molecular markers for efficiency in backcrossing and optimizing selection methods to improve trait recovery.
- 6: Optimization of Product Pipeline
- This page discusses the cultivar improvement process involving the selection of top-performing individuals, highlighting key metrics like response to selection (R) and genetic gain (ΔG). It addresses genotype by environment interaction (GxE) and its impact on cultivar selection accuracy, emphasizing the need for optimized testing environments and analytical tools.
- 7: Launching Improved Cultivars
- This page outlines the meticulous new product release process for hybrid cultivars, highlighting the significance of DUS and VCU testing for genetic integrity and quality control. It underscores the need for seed purity verification, phytosanitary testing, and the protection of intellectual property through Plant Variety Protection (PVP) mechanisms.