Articles written in Journal of Genetics
Volume 37 Issue 1 December 1938 pp 119-128
The inheritance of a “purple anthocyanin” character in apples is described.
A technique for increasing the percentage of germination by removing the testa is described. The percentage of scorable plants was increased from 56 to 99. No differential viability of the “green” and “purple” embryos was found.
Volume 38 Issue 1-2 July 1939 pp 367-379
Volume 43 Issue 1-2 January 1942 pp 31-43
Volume 43 Issue 1-2 January 1942 pp 211-222
1. Self-incompatibility in diploid pears is due to arrested pollen-tube growth. Three days after pollination the tubes are approximately one-third of the way down the style and their ends are swollen.
2. In a cross between two diploid varieties compatible and incompatible tubes are present indicating gametic determination of incompatibility.
3. The somatically doubled autotetraploid Fertility is self-fertile, but both compatible and incompatible tubes are present in selfed styles. Compatible tubes of the tetraploid grow faster than compatible tubes of diploids both in tetraploid and in diploid styles.
4. The breakdown of the self-sterility mechanism following chromosome doubling is reviewed and found to be of fairly widespread occurrence in plants. A working hypothesis to explain the effect of polyploidy on self-sterility is given: it is based on the assumption that
5. Pollen tubes of the diploid variety Beurré Bedford grow as fast as those of a tetraploid variety, penetrate the style and enter the embryosac; but only rarely do they effect fertilization. Beurré Bedford pollen grains are unreduced pollen mother cells with haploid, diploid, triploid, and tetraploid nuclei. The high rate of growth of the pollen tubes is due to the nature of the pollen cell and the failure to fertilize the eggs to the lack of balance between the sperm nuclens and the cell.
6. The result of this normal pollen-tube growth without fertilization is the formation of seedless fruits.
Volume 45 Issue 2 October 1943 pp 171-185
Volume 45 Issue 3 December 1943 pp 261-264
Heat-shocks applied to the pollen mother cells, followed by self-pollination is effective in producing triploids in fruit trees. The method depends upon the sieve-like action of incompatibility on the pollen, allowing only diploid pollen tubes to reach the ovary, although much of the pollen is haploid. Since only pollen grains which carry two different
By this method triploids have been produced from diploid pears. In diploid cherries, fruits have been obtained, but the seeds were small and inviable. In a self-incompatible plum (2
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