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- W74857605 abstract "ABSTRACT Gametophytic selection (GS) as a method of plant breeding has been proposed only recently, therefore its role in the evolution of crop plants should be considered as natural selection acting in combination with sporophytic natural and artificial selection. The genetical basis of GS is revealed by the large extent of post-meiotic gene expression and of gametophytic-sporophytic genetic overlap (haplo-diploid gene expression). The high efficiency of GS for those traits expressed during the gametophytic phase is the result of the large number of pollen grains produced by each plant and the haploid state of the gametophytic generation. Moreover for several crop plants it is to be expected that special environmental factors in cultivated fields will produce higher intensity of GS. Male gametophytic fitness varies in both natural populations and in crop varieties. This variability can be due to pollen viability, pollen competition within the anther and post-pollination competition. Several experimental results indicate that at least a significant portion of this variability is due to post-meiotic gene expression. A number of studies have been carried out to prove that GS can modify sporophytic traits. These effects have been found for plant and kernel development, plant fertility, environmental stress and desease resistances and for characters which regulate the breeding system. This large body of data indicates the importance of GS in the evolution of crop species. However present knowledge is still too fragmentary to assess the contribution of GS in comparison with natural and artificial selection." @default.
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- W74857605 date "1986-01-01" @default.
- W74857605 modified "2023-10-16" @default.
- W74857605 title "Gametophytic Selection as a Factor of Crop Plant Evolution" @default.
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- W74857605 doi "https://doi.org/10.1016/b978-0-444-42703-8.50012-9" @default.
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