Lecture 4 - Pulse Breeding Using Wild Relatives Flashcards
breeding objectives
yield
seed size, color and shape
disease resistance
earliness
micronutrients
seed, pod, stiff stem
frost tolerance
what is SINGing
systematic introgression of novel germplasm where crosses are done with non-elite material (non cultivar x cultivar)
what is SCREAMing
systematic creation of radically exotic abnormal material such as introducing wild progenitor of domesticated species
what is the wild progenitor of lentil
Lens orientalis
why use wild lentil
disease resistance
diverse root architecture
diverse interactions with rhizobia
diverse reactions to stress
diverse interaction with light quality
diverse seed quality characteristics
what are the 6 main wild relatives of lentil
L. ervoides, L. lamottei, L. odemensis, L. tomentosus, L. orientalis, and L. culinaris
what wild ancestor of lentil is the farthest relative/ hardest to breed with
L. nigricans
gene pool
how related/close species are related
what is one of the main breeding objectives of lentil
anthracnose resistance
what are the downsides of crossing to wild progenitors/lentils
shattering
prostrate growth habit
small seed size
seed dormancy
photoperiod response
how has the efficiency in the use of wild species been improved
-hybridization and embryo rescue techniques
-seed multiplication techniques
-screening techniques
when is zygotic embryo rescue technology used
used when you cross something that is not closely related and plant will reject it
what are tepary beans (P. acutifolius)
beans that were adapted to the desert and had some ideal abiotic tolerance genes
why are tepary beans used
-resistance to bacterial diseases
-abiotic stresses
-higher N fixation
-tolerance to sub-zero temps
steps to using wild progenitors
- looking for genes in wild species
- cultivated x wild
- crossing and embryo rescue
- interspecific populations
- transfer to breeding lines
- utilization of favorable genes
