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Heterosis and Hemeostasis in Secale montanum Guss. ✕ S. cereale L. Hybrids II. Reproductive Characteristics 1
Author(s) -
Pfahler P. L.
Publication year - 1968
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/cropsci1968.0011183x000800060008x
Subject(s) - secale , biology , pollen , hybrid , population , heterosis , botany , demography , sociology
F 1 hybrids between Secale montanum (P.1.253956) the female parent and three varieties (‘Florida Black,’ ‘Gator,’ and ‘Wrens Abruzzi’) of S. cereale were made. F 2 populations were produced by interpollination within each F 1 population. Under natural daylength and space‐planted conditions, 40% of the S. montanum plants produced seed in 1965‐66 and 10% in 1966‐67, whereas 100% of the plants in the S. cereale varieties and 70 to 100% of the F 1 and F 2 plants produced seed. For number of seeds, seed weight, and grain yield, the F 1 populations were generally intermediate to the parents with S. montanum the lower parent in all combinations. The F 2 populations tended to produce a larger number of seeds than the corresponding F 1 . Substantial differences resulting from the S. cereale variety involved and year tested were observed. The variability of both the F 1 and F 2 populations as a result of differences in years and the variation within the F 1 populations were greater than the higher parent. However, the S. cereale variety involved was a major factor. With 16‐hr daylength, the F 1 populations were generally below or equal to the mid‐parent in percent stainable pollen with S. montanum the lower parent in all combinations. However, the corresponding F 2 populations were higher in percent stainable pollen with two out of three combinations exceeding the S. cereale parent. The pollen diameter of the F 1 and F 2 populations was generally intermediate to the parents with S. montanum the lower parent in all combinations.