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Comparison of S 1 and Open‐Pollination Progenies of Astragalus cicer L. for Certain Agronomic Characters 1
Author(s) -
Townsend C. E.
Publication year - 1972
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/cropsci1972.0011183x001200060023x
Subject(s) - biology , forage , inbreeding depression , open pollination , seedling , pollination , self pollination , inbreeding , horticulture , agronomy , botany , pollen , population , demography , sociology
Self‐ (S 1 ) and open‐pollination (O.P.) progenies of 24 self‐compatible S 0 plants of cicer milkvetch ( Astragalus cicer L.) were evaluated in the field for forage yield, height, spread, vigor score, and date of flowering. One generation of inbreeding had such a deleterious effect on plant vigor that paired S 1 and O.P. progenies could be differentiated visually. Forage yields of the S 1 progenies were approximately 50% of the forage yields of O.P. progenies. Considerable variation occurred among S 0 plants for inbreeding depression. Inbreeding delayed flowering approximately 10 days in the seedling year, but there was little difference between the S 1 and O.P. progenies for mean date of flowering in subsequent growth periods. There was no relationship between the self‐compatibility of the S 0 parents and forage yields of their S 1 and O.P. progenies. There were significant differences among S 0 parents for general combining ability. Open‐pollination progenies of several S 0 plants with average vigor performed better than similar progenies of S 0 plants with excellent vigor. Simple correlation coefficients between forage yield, height, spread, vigor score, and date of flowering were highly significant. The associations between vigor score and forage yield were the highest with coefficients of —0.93, —0.91, and —0.92 for the one harvest in 1970 and the first and second harvests in 1971, respectively.