Inheritance of Seed Set in Crosses of Spring Barley and
            Hordeum bulbosum
            L

Low seed set, owing to partial incompatibility, can limit sexual gene transfer and haploid production efficiency in wide crosses. The inheritance of partial incompatibility in barley Hordeum vulgare L. × H. bulbosum L. crosses and its effect on gamete sampling in doubled haploid production were studied by doubled haploid progeny analysis. The dominant, monogenic control of partial incompatibility in 'Vada' was confirmed. Partial incompatibility in 'Harrington' is also monogenic but appears to be controlled by a different gene. An association between the Inc gene and a deficiency in a stigma–stylodium specific high pI protein was found in the co-segregation analysis of doubled haploid progeny. Segregation analysis of Mendelian markers in doubled haploid progeny showed that there is no evidence that the compatibility status of the parents has an effect on gamete sampling by the bulbosum technique.Key words: barley, haploids, Hordeum bulbosum, incompatibility.

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COMPARISON OF THE CROSSABILITY OF RYE (SECALE CEREALE) AND HORDEUM BULBOSUM ONTO WHEAT (TRITICUM AESTIVUM)

Canadian Journal of Genetics and Cytology ◽

10.1139/g81-010 ◽

1981 ◽

Vol 23 (1) ◽

pp. 81-88 ◽

Cited By ~ 67

Author(s):

D. E. Falk ◽

K. J. Kasha

Keyword(s):

Triticum Aestivum ◽

Secale Cereale ◽

Seed Set ◽

Genetic System ◽

Triticum Aestivum L ◽

Hordeum Bulbosum ◽

Factors Influencing ◽

Main System ◽

Wheat Lines ◽

System Operating

Fifty-six wheat (Triticum aestivum L.) lines representing a wide diversity of germplasm were screened for crossability with rye. Seed set values ranged from 0.0% to 95.4% of the florets pollinated. Twenty-eight of these wheat lines representing the range of crossability with rye were then pollinated with tetraploid Hardeum bulbosum L. Seed set ranged from 0.0% to 32.2%. Those wheats giving seed set with H. bulbosum generally had medium to high crossability with rye. A high correlation (r = 0.75) was obtained for crossability of rye and H. bulbosum on wheat, indicating that the main genetic system (Kr1 and Kr2) governing crossability with rye is also the main system operating in crosses with H. bulbosum. Evidence for additional factors influencing crossability and for differences between rye and H. bulbosum is provided. Hybrids between wheats having different crossability levels exhibited intermediate crossability levels with rye but very low crossability with H. bulbosum. Hordeum bulbosum genotypes differ in their ability to effect seed set.

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BEHAVIOUR AND EFFECTIVENESS OF BEES IN POLLINATING LEGUMES

Proceedings of the New Zealand Grassland Association ◽

10.33584/jnzg.1974.36.1416 ◽

1974 ◽

pp. 105-110

Author(s):

I.W. Forster

Keyword(s):

White Clover ◽

Seed Set ◽

Red Clover ◽

Potential Maximum ◽

Open Fields

One honeybee or bumblebee working on each square metre of white clover or red clover gave adequate pollination. This could be obtained with one hive of honeybees to each three hectares of flowering clover. Lucerne seeding averaged only 10% of the potential maximum in open fields with honey- or bumblebees. In cages where honeybees were forced to gather pollen, this was raised to 30% but it was not possible to increase seed set significantly in the fields.

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