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Influence of Triticum timopheevii Cytoplasm on Pollen Production and Dispersal in Common Wheat 1
Author(s) -
Johnson Jerry W.,
Patterson F. L.
Publication year - 1980
Publication title -
crop science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.76
H-Index - 147
eISSN - 1435-0653
pISSN - 0011-183X
DOI - 10.2135/cropsci1980.0011183x002000030024x
Subject(s) - biology , pollen , stamen , cytoplasmic male sterility , pollinator , biological dispersal , common wheat , backcrossing , botany , horticulture , pollination , agronomy , sterility , population , genetics , chromosome , gene , demography , sociology
Breeders of hybrid hexaploid wheat ( Triticum aestivum L. aestivum group) are developing R‐lines (pollinators) with cytoplasm and male‐fertility restorer genes derived from Triticum timopheevii (Zhuk.) Zhuk. var. timopheevii . It is important to determine if such R‐lines have reduced pollen production and dispersal compared to their respective B‐lines. The soft wheat cultivar ‘Monon’ was compared to three recovered backcross Monon‐type R‐lines with both cytoplasm and nuclear male‐fertility restorer factors derived from T. timopheevii . Pollen production and dispersal were measured by pollen collection in automatic spore traps, percent anther extrusion, and percent seed set on A‐lines. In spore trap comparisons A‐line 68846L2 dispersed significantly fewer total pollen grains than Monon, 1559 vs. 1975. The patterns of daily dispersal over the 7‐day period were generally similar for the R‐line and Monon although a significant day × pollinator interaction occurred. The three R‐lines were equal to Monon in anther extrusion with an average of 92% of the anthers extruded. The R‐lines and Monon were equally effective as pollinators in effecting seed set on three A‐lines (mean=60%). The small reduction in pollen dispersal of R‐lines was not great enough to reduce the effectiveness of the R‐lines as pollinators when compared to Monon at the 60% level of seed set for A‐lines in these experiments.