坛紫菜耐低氮磷品系选育的研究

在含氮量仅为海区的1/100、含磷量仅为海区的1/15的低氮、磷环境下,对人工选育和建立纯系的坛紫菜褐绿色、红棕色品系3代叶状体(F1、F2、F3)的耐受力情况及生长情况进行研究,发现2个品系的藻体均具有极强的耐低氮、磷能力:1)褐绿色藻体在低氮、磷环境下培养21 d才停止生长,叶片无成熟现象,仅轻微的腐烂和萎缩.3～4 cm长的藻体培养7～9 d时的长度日生长量是对照组的4.73倍,鲜重日增重率是对照组的5.29倍;培养18～21 d时的长度日生长量为(0.86±0.27)cm,鲜重日增重率为(5.32±0.21)%.褐绿色品系F3代的平均长度比对照组长28.7 cm.2)红棕色藻体在相同条件下培养15 d后停止生长,叶片无成熟、腐烂和萎缩,3代叶状体在低氮、磷甚至无氮、磷环境下的耐受力和生长状况均比较稳定且有所提高,遗传性状比较稳定.3～4 cm长的红棕色藻体在低氮、磷环境下培养7～9 d时的长度日生长量是对照组的4 95倍,鲜重日增重率是对照组的3.58倍;培养13～15 d时藻体的长度日生长量为(1.92±0.53)cm,鲜重日增重率为(13.61±0.46)%.F3代的平均长度比对照组长23.16 cm.3)通过选育可以看出褐绿色品系比较耐低氮、磷,该品系可以较好地解决养殖过程中低氮、磷环境对于紫菜养殖所造成的危害,缓解由于养殖密度过大而造成的病害发生和减产、减收现象.

Study on Selection of Low N and P Resistant Strains in Porphyra haitanensis

This study discussed the tolerance capability and growth under low N and P conditions(N contents was only 1/100 times of the sea area and P contents was only 1/15 times of the sea area) on the three filial generations(F 1,F 2,F 3) of the breen and the red brown Porphyra haitanensis stains from artificial selection and pure lines,the results showed that both of the two strains had high capability of low N and P resistant:1)The breen blades stopped growing after having been cultured 21 days under low N and P ...