Corylus Dorris Cultivar Eastern Filbert Blight Resistance
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Solution Overview
Problem
Current Corylus avellana cultivars lack effective resistance to eastern filbert blight and exhibit variability in nut characteristics, making them unsuitable for consistent and disease-resistant cultivation.
Innovation Solution
The development of the 'Dorris' cultivar, resulting from a controlled cross between OSU 309.074 and 'Delta', which exhibits resistance to eastern filbert blight, characterized by specific DNA markers and unique morphological traits, including low vigor, yellowish-green leaves, and distinct nut features, ensuring stability and true-to-type reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If current Corylus avellana cultivars are used for cultivation, then cultivation can proceed with existing varieties, but they lack effective resistance to eastern filbert blight and show variability in nut characteristics
Solution Approach 1:
The patent applies parameter changes by selecting and fixing specific genetic parameters through controlled crossing. The F1 hybrid 'Dorris' exhibits consistent nut characteristics (size, shape, kernel percentage) and disease resistance parameters that differ from both parents, achieving reliability through genetic parameter optimization.
Solution Approach 2:
The patent creates a composite genetic structure by crossing two distinct Corylus avellana cultivars (OSU 309.074 and 'Delta'). This composite approach combines desirable traits from both parents, resulting in an F1 hybrid that exhibits heterosis with improved disease resistance and consistent nut characteristics.
2Productivity
If existing Corylus avellana cultivars are cultivated, then cultivation can continue with current varieties, but they exhibit variability in nut characteristics making them unsuitable for consistent cultivation
Solution Approach 1:
The patent changes the genetic parameters by creating an F1 hybrid with fixed heterozygous genotypes. This ensures that all progeny from asexual reproduction (suckers, grafts) have identical and stable nut characteristics, achieving both productivity and compositional stability.
Solution Approach 2:
The patent uses asexual reproduction methods (suckers, whip grafting, budwood grafting) to create exact genetic copies of the F1 hybrid 'Dorris'. This copying approach ensures that all propagated plants maintain the same stable nut characteristics and disease resistance traits as the original selected plant.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The 'Dorris' cultivar demonstrates significant resistance to eastern filbert blight and bud mites, with stable and consistent nut characteristics, improving disease resistance and cultivation reliability.
Implementation Method 1
Presence of random amplified polymorphic DNA markers 152-800 and 268-580 in DNA of 'Dorris' amplified by the polymerase chain reaction
Implementation Method 2
DNA fingerprints at 14 of 24 microsatellite marker loci differ from both parents OSU 309.074 and 'Delta'
Data Source
AI summary
A new and distinct cultivar of Corylus plant named ‘Dorris’ characterized by a spreading plant habit and low vigor, yellowish-green developing and fully expanded leaves during the spring and summer, resistance to eastern filbert blight caused by the fungus Anisogramma anomala (Peck) E. Müller, presence of random amplified polymorphic DNA markers 152-800 and 268-580, expression of incompatibility alleles S1 and S12 in the styles, and DNA fingerprints at 14 of 24 microsatellite marker loci differ from both parents OSU 309.074 and ‘Delta’, and from one parent at an additional 9 marker loci.