tailieunhanh - Báo cáo khoa học: "Effects of osmotic priming using aerated solutions of polyethylene glycol on germination of pine seeds"

Tuyển tập các báo cáo nghiên cứu về lâm nghiệp được đăng trên tạp chí lâm nghiệp quốc tế đề tài: Effects of osmotic priming using aerated solutions of polyethylene glycol on germination of pine seeds. | 31 Ann. Sci. For. 1989 46 31-37 Elsevier INRA Original article Effects of osmotic priming using aerated solutions of polyethylene glycol on germination of pine seeds . Hallgren Department of Forestry Oklahoma State University Stillwater OK 74078 USA received 15-2-1988 accepted 7-6-1988 Summary Osmotic priming with aerated solutions of polyethylene glycol improved both final germination and rapidity of germination in loblolly and shortleaf pines and was generally detrimental to germination of slash pine seeds. Priming solutions with water potentials of and MPa were most effective and the beneficial effects were greatest for germination at low temperature stratification prior to treatment eliminated the beneficial effect of priming on total germination but not on rapidity of germination. The aerated solution method of priming could be upgraded to handle large quantities of seed. seed germination Pinus taeda osmotic priming Resume Effets d un prétraitement osmotique dans des solutions aérées de polyéthylène glycol sur la germination des graines de pins. Des graines de Pinus taeda L loblolly pine p. elliottii Engelm. slash pine ef de p. echinata Mill shortleaf pine ont reọu des prétraitements osmotiques dans des solutions aérées de polyéthylène glycol PEG . Elies ont ensuite été mises à germer afin d etudier les effets du prétraitement sur la Vitesse et le taux de germination. On a de plus compare pour les graines de loblolly pine et de slash pine I effet de la presence OU de absence d une stratification au froid préalable au prétraitement osmotique. En revanche les graines de shortleaf pine ont toutes été stratifiees. Les essais de germination ont été realises à deux temperatures 1 en dessous de I optimum à 15 C 2 à temperature voisine de optimum à 25 c En general les prétraitements osmotiques ont surtout amélioré la Vitesse de germination et en absence de stratification le faux de germination de loblolly et shortleaf pine mais les effets ont été negatifs

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