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Heritable variations in seed set under bag among plants of orchard grass, Dactylis glomerata L



Heritable variations in seed set under bag among plants of orchard grass, Dactylis glomerata L



Journal of the American Society of Agronomy 34(11): 1042-1051



In 1938, panicles on 497 plants of orchard grass (Dactylis glomerata L.) from open-pollinated populations were enclosed in parchment bags prior to flowering. The number of seeds per panicle set under bag varied on the different plants from 0 to over 200. In 1940, data on number of seeds per panicle set under bag and with open-pollination were obtained from 46 replicated parental clones and their first-generation inbred (I(1)) progenies. The parental clones ranged from 1.8 to 145.6 seeds per panicle set under bag and the parent-inbred progeny correlation coefficient for this character was statistically significant (r=0.618, D/F=44). The average number of seeds per panicle set under bag was 40.2 for the 46 clones and 14.9 for their inbred progenies. The difference was highly significant statistically. No simple Mendelian basis for inheritance of ability to set seed under bag could be postulated from the distributions of plants in the I(1) families. Comparisons of parent with inbred progeny showed a significant reduction accompanying inbreeding in number of seeds set with open-pollination. The parent-progeny correlation coefficient for this character was statistically significant (r=0.493, D/F=44). Selfed seed set was expressed as percentage of open seed set to obtain a self-fertility value. The parental clones ranged from 0.8 to 54.5% and the differences among clones were statistically significant. The parent-progeny correlation coefficient was 0.677 which with 44 D/F is highly significant. The reduction in percentage seed set of inbreds as compared with their parental clones was not significant statistically. Within the inbred families, vigor was not closely correlated with ability to set seed under bag.

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