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Interrelations Among Vigor, Height, and Seed‐Set Following Self‐ and Open‐Pollination of Timothy ( Phleum pratense L.) 1
Author(s) -
Nath J.,
Nielsen E. L.
Publication year - 1961
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/cropsci1961.0011183x000100050014x
Subject(s) - phleum , geneticist , crop , library science , biology , mathematics , botany , agronomy , computer science , genetics
T establishment of interrelationships among plant characters, both within and between generations, is of interest in a timothy improvement program. Characteristics considered in this paper include vigor, plant height, and seed-set following selfand open-pollination in S0, S1> and S2 populations. Although this species has been subjected to many investigations, data dealing with correlated studies between inbred and open-pollinated populations are relatively scarce. The literature relating to timothy has been reviewed recently (3); hence only that regarded as particularly pertinent is referred to in this paper. Nilsson (4) found an average of 27.3 seeds per panicle following self-pollination of 131 plants of several strains. The average is based on 0 to 521 seeds obtained per panicle self ed. Variations in self-fertility were attributed to the genetic nature of different individuals. Cross-pollination produced from 67 to 552, with a mean of 261, seeds per inflorescence. A positive correlation of 0.72 was obtained between seed-set in selfed and open-pollinated inflorescences of previously non-inbred plants. Associations between selfand crossfertility among different families tended to be statistically nonsignificant. However, this relationship was highly significant (rr:0.4l;P>99:l) when the computation was based upon the entire population. Nilsson regarded variations in selfand cross-fertility as independent. Significant positive inter-annual correlations were recorded in height of families (1). Intra-annually, height and general fertility, and height and self-fertility, were closely correlated. Hayes and Barker (2) found that seed-set following self-pollination varied from 1 to 331 seeds per panicle of greenhouse-grown plants. Seed-set in an isolated field varied from 0 to 495 seeds per inflorescence. The variations were considered genotypic. Nielsen and Smith (3) found no correlation between vigor of S0 and S^ seedlings whereas the vigor of the S0 and Sj adult plants was highly correlated. The mean heights of S0 and S± progenies in their first heading year were closely associated.