Nitrogen and water-soluble carbohydrate contents of Kentucky 31 tall fescue (Festuca arundinaceae Schreb) tillers were determined on a regrowth following clipping to a 25cm stubble. There was a sharp decline in water-soluble carbohydrates of tillers as a result of clipping and N fertilization. Dry matter N content increased during the same time. The reduced carbohydrate content for clipped tillers lasted for some 10 days following clipping. After the initial decrease, water-soluble carbohydrate content in tillers increased for the next 80 days. The negative correlation between tiller N and carbohydrate content suggested that initial tiller regrowth was obtained partially from carbohydrate reserves in addition to current photosynthate production. N application immediately following clipping is at a time of low carbohydrate content and could well cause stand reduction.

Bahrani, J. and McVetty, P. B. E. 2008. Relationship of seed quality traits for greenhouse-grown versus field-grown high erucic acid rapeseed: Is seed quality trait selection for greenhouse-grown seed worthwhile? Can. J. Plant Sci. 88: 419{423. A study of the relationship of seed quality traits for greenhouse-grown and field-grown seed samples was conducted. Early generation high erucic acid rapeseed (HEAR) cross progeny were grown in the greenhouse, selfed and then the selfed seeds were grown in the field at the University of Manitoba. The oil, protein, erucic acid and glucosinolate concentrations of greenhouse-grown versus field-grown seed samples were compared. There were differences (P50.01) between the means of all seed quality traits for greenhouse-grown versus field-grown seed samples. The mean oil, protein and erucic acid concentrations of field-grown seed samples were higher than for greenhouse-grown seed samples. In contrast, the mean glucosinolate concentration of greenhouse-grown seed samples was higher than for field-grown seed samples. Rank correlations between greenhouse-grown seed samples and field-grown seed samples for all seed quality traits were significant but moderate in magnitude. Selection for oil, protein, erucic acid and glucosinolate concentration in greenhouse-grown seed samples dramatically increased the number of high seed quality F 4 families in the field and was successful for all seed quality traits. It is concluded that seed quality selection in greenhouse-grown seed samples is worthwhile and that this procedure could lead to greater efficiencies in Brassica plant breeding programs.Key words: Rapeseed (Brassica napus L.), oil, protein, erucic acid, glucosinolates Bahrani, J. et McVetty, P. B. E. 2008. Liens entre les parame`tres de la qualite´grainie`re du colza a`haute teneur en acide e´rucique cultive´en serre ou au champ : vaut-il la peine de se´lectionner les semences re´colte´es en serre en fonction de leur qualite´? Can. J. Plant Sci. 88: 419Á423. Les auteurs se sont inte´resse´s aux liens existant entre les parame`tres de la qualite´des graines de colza re´colte´es en serre ou au champ. À cette fin, ils ont cultive´les hybrides d'une des premie`res ge´ne´rations de colza a`haute teneur en acide e´rucique en serre, re´colte´les graines de la S1 puis cultive´ces dernie`res en pleine terre, al 'Universite´du Manitoba. Ensuite, ils ont compare´la concentration d'huile, de prote´ines, d'acide e´rucique et de glucosinolates des semences re´colte´es en serre et au champ. La moyenne des deux e´chantillons varie (P50,01) pour tous les parame`tres de la qualite´grainie`re. Les e´chantillons pre´leve´s au champ avaient une plus forte concentration moyenne d'huile, de prote´ines et d'acide e´rucique que les e´chantillons recueillis en serre qui, en revanche, e´taient plus riches en glucosinolates. Apre`s classement, les corre´lations entre le rang des semences re´colte´es en serre et celles re´colte´es au champ s'ave`rent significatives pour tous les parame`tres de la qualite´, mais ...