Abstract
THE vigorous growth of hybrids between closely related varieties has been widely observed, and for several years the phenomenon has received the attention of geneticists. Investigations have also been made on the physiology of hybrid vigour (heterosis). Ashby1 and Luckwill2 have shown that in the tomato heterosis is manifested at an early stage in the life-history, between fertilization and seed ripening, so that the ripe hybrid seed, resulting from cross-pollination, is larger and heavier than that of the parent strain. In a recent experiment a different result has been obtained, and the causes of this contradiction have been investigated.
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References
Ashby, Ann. Bot., n.s., 1 (1937).
Luckwill, Ann. Bot., n.s., 1 (1937).
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HATCHER, E. Hybrid Vigour in the Tomato. Nature 143, 523 (1939). https://doi.org/10.1038/143523a0
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DOI: https://doi.org/10.1038/143523a0
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