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There were genotypic differences for both seed and embryo size but the two were not related.
Experiments showed that within genotypes larger seed had larger embryos which, on germinating, produced longer coleoptiles, more vigorous seedlings resulting in higher grain yields.
Rate of emergence from normal sowing depths was not affected.
Genotypic variability occurred for Zn and Mn efficiency and also for Zn and Mn accumulation in the seed.
Yallaroi, the durum, performed poorly in these experiments.
There is genetic variability for embryo size, coleoptile length, nutrient efficiency and nutrient loading in to the seed which can be exploited by breeders.