生防菌对向日葵列当的防除作用的初步研究

通过室内穴盘和连续两年遮雨棚盆栽试验,研究放线菌淡紫褐链霉菌(Streptomyces enissocaesilis,509),真菌灰黄青霉(Penicillium griseofulvum,CF3)和放线菌密旋链霉菌(Streptomyces pactum,Act12)3种生防菌对寄主植物向日葵的促生作用和对向日葵列当种子萌发的抑制作用。结果表明:1)CF3和Act12处理条件下,列当的出土数和寄生总数量显著降低,在新葵6号中CF3抑制列当寄生率高达74.4%,Act12抑制列当寄生率为68.7%,509抑制列当寄生率为53.0%;2)在列当寄生胁迫下,生防菌处理向日葵相比对照生物量有显著的增高,根冠比显著增大,含水量显著升高,生防菌处理的向日葵地上部和根的含水量≥70%。本研究表明CF3和Act12具有作为防除向日葵列当优良生防菌种的可能性。

Preliminary study on the bio-control effect of microorganism on sunflower broomrape (Orobanche cumana Wallr.)

The experiments of three types of bio-control microorganism (Streptomyces enissocaesilis(509), Penicillium griseofulvum (CF3) and Streptomyces pactum (Act12)) on the growth of host plant sunflower and the inhibition of sunflower broomrape seed germination were conducted under the laboratory potted tray and two years rain shed pot experiment condition.The results indicated that:1) Under CF3 and Act12 treatments, the number of broomrape shoot coming up out of the ground and the total number of broomrape shoot were all decreased significantly.For Xinkui No.6, the inhibition effect of CF3 on broomrape parasitism reached 74.4%, Act12 was 68.7% and 509 was 53.0%;2) Under the stress of broomrape parasitism, the biomass of bio-control microorganism sunflower increased, and its root-shoot ratio also increased.Compared with the control, the increase in water content was significant, and the water content of bio-control microorganism treated sunflower aboveground and root were all over 70%.This study demonstrated that CF3 and Act12 displayed potential for the biocontrol of sunflower broomrape.