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The crossing of common wheat triticum aestivum with cultivated rye secale cereale part 1 crossability pollen grain germination and pollen tube growth



The crossing of common wheat triticum aestivum with cultivated rye secale cereale part 1 crossability pollen grain germination and pollen tube growth



Euphytica 25(3): 609-620



The crossing of common wheat with rye and especially the action of the crossability genes of wheat was studied using the readily crossable wheat cv. 'Chinese Spring' (genotype kr1 kr1 kr2 kr2), the poorly crossable wheat cv. 'Hope' (genotype Kr1 Kr1 Kr2 Kr2), as well as the disomic substitution line of chromosome 5B of 'Hope' into 'Chinese Spring' (CS 'Hope' 5B, genotype Kr1 Kr1 kr2 kr2). By comparing crossability and actual fertilization, the poor crossability with rye of both 'Hope' and the 'CS'/'Hope' 5B substitution line was shown to result from absence of fertilization. Studies of pollen grain germination and pollen tube growth showed that the dominant alleles of the crossability genes manifested themselves through retardation and eventually inhibition of pollen tube growth at the style base and in the ovary wall. In 'Hope' the growth of all pollen tubes was inhibited, whereas in 'CS'/'Hope' 5B fertilization was rarely achieved. The recessive alleles of the crossability genes do not seem to have an influence on the growth of rye pollen tubes in wheat pistils.

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