cropscience.ch


Just another CropScience weblog

Archive for October, 2010

Field designs for replicated trials

Replicated trials are applied for a reduced genotype set (n=300). To make sure that genotypes are selected properly one has to assure that the environmental effect on selecting decision is reduced. I.e. a variety can have a high yield in the leftern corner of the field, which might be genotypic effect, but can also be [...]

October 31st, 2010
Topic: Crop Science, Plant breeding Tags: None

Field designs for unreplicated trials (early breeding stages)

Unreplicated trials are applied at early stages of a breeding program. The breeder has already pointed out breeding objectives and built up the set of genotypes for selection. It is mostly not possible to put this set with multiple replications into the field as, -        There is only limited seed available (i.e. in the case [...]

October 31st, 2010
Topic: Crop Science, Plant breeding Tags: None

Implications of self-incompatibility and cytoplasmatic male sterility (CMS) for hybrid breeding

Self-incompatibility Self-incompatibility is a condition in which the pollen from a flower is not receptive on the stigma on the same flower and thus is incapable of setting seed. The advantage for the plant is that heterozygosity is promoted by outcrossing. As such there is always the possibility that an offspring is adapted to a [...]

October 6th, 2010
Topic: Crop Science, Plant breeding Tags: None

Apomixis

Apomixis is the phenomenon when seed is developed without fertilization. As a result no recombination occured and the developed seeds are clones of the mother plant. The advantage for the plant breeder is that he can develop hybrids that retain their original genetic properties without the need of reproducing the cross. Additionally uniformity is reached [...]

October 5th, 2010
Topic: Crop Science, Plant breeding Tags: None