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1.向日葵胚在离体培养中在不同发育期要求不同浓度的蔗糖。1,000—1,100微米长的幼胚最适蔗糖浓度力17.5%左右,2,000—2,500微米长的胚为16%左右,5,000—5,500微米长的胚力12.5%左右,10,000微米长的胚力6%左右。2.氯化钠(0.2—0.4%)或甘露醇(1.125—5.5%)可以部分替代蔗糖的渗透作用,但0.8%氯化钠对幼胚有毒害作用。3.胚在低渗培养基中生长时有提早萌发现象,在接近等渗培养基中继续胚性生长,而在高渗培养基中则生长受抑制。
1. Sunflower embryos require different concentrations of sucrose at different developmental stages in vitro. 1,000-1,100 micron long embryo optimum sucrose concentration of about 17.5% strength, 2,000-2,500 micron long embryo is about 16%, 5,000-5,500 micron long embryo force of about 12.5%, 10,000 micron long embryo force of about 6% . 2. Sodium chloride (0.2-0.4%) or mannitol (1.125-5.5%) can partially replace the infiltration of sucrose, but 0.8% sodium chloride has toxic effects on immature embryos. Embryo germination in the hypotonic medium with early germination, in near isotonic medium continue embryogenic growth, while in hypertonic medium growth inhibition.