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Outdoor evaluation of herbicide resistant strains of Anabaena variabilis as biofertilizer for rice plants

机译：变色鱼腥草作为水稻植物生物肥的抗除草剂菌株的室外评价

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摘要

Application of diazotrophic cyanobacteria, Anabaena variabilis, as biofertilizer for rice cultivation has a beneficial effect on crop productivity and maintenance of soil fertility. However, periodic applications of herbicides used to obtain high crop productivity are not only detrimental to weeds but to biofertilizer strains of cyanobacteria also. Therefore, research was undertaken to isolate four herbicide resistant strains (Arozin-R, Alachlor-R, Butachlor-R and 2,4-D-R) and a multiple herbicide resistant strain (MHR) of natural isolates of A. variabilis exhibiting resistance against these common rice field herbicides. The outdoor survivability of mutant strains and the productivity of rice crop (IR-36) were evaluated by inoculating the wild type and herbicide resistant mutant strains of A. variabilis in the presence and absence of recommended field dosages of test herbicides. No difference in survival and biofertilizer potentials of the herbicide resistant strains was observed in herbicide treated or in untreated conditions. Highest survivability (87%) was exhibited by MHR relative to other mutants. Highest growth and grain yield (76%) were recorded in plants treated with MHR as compared to uninoculated control rice plants. In conclusion, the mutant strains of A. variabilis had stable resistance to herbicides under outdoor conditions in flooded soils. Not only did the herbicide resistance strains increase growth of rice relative to the uninoculated pots, they were more beneficial for rice growth than the wild type strain..
机译：重氮营养蓝细菌鱼腥藻作为水稻种植的生物肥料的应用对作物生产力和维持土壤肥力具有有益作用。然而，周期性施用用于获得高作物产量的除草剂不仅有害于杂草，而且有害于蓝细菌的生物肥料。因此，进行了研究以分离出四种天然除草剂天然抗性的抗除草剂菌株（Arozin-R，Alachlor-R，Butachlor-R和2,4-DR）和多种除草剂抗性菌株（MHR）。常见的稻田除草剂。通过在存在和不存在建议的田间试验除草剂剂量的情况下接种野生变异型和抗除草剂的曲霉来评估突变株的室外存活性和水稻作物的生产力（IR-36）。在除草剂处理的或未处理的条件下，未观察到除草剂抗性菌株的存活率和生物肥料潜力的差异。相对于其他突变体，MHR表现出最高的存活率（87％）。与未接种的对照水稻植物相比，用MHR处理的植物记录到最高的生长和谷物产量（76％）。综上所述，在室外水淹条件下，变异曲霉菌株对除草剂具有稳定的抗性。相对于未接种的盆，除草剂抗性菌株不仅增加了水稻的生长，而且比野生型菌株更有利于水稻的生长。

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