Acclimatisation of orchids using plant growth-promoting bacteria and humic acids

Klever Cristiano Silveira, Raphael Oliveira de Melo, Marihus Altoé Baldotto, Lílian Estrela Borges Baldotto
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Abstract

ABSTRACT Acclimatisation of orchid seedlings propagated in vitro is a slow process that can be accelerated with the use of plant growth-promoting microorganisms and humic substances. The aim of this study was to evaluate the plant’s response to inoculation with plant growth-promoting bacteria and humic acids, as well as to their combined use, during the period of acclimatisation of Cymbidium sp. orchids. The treatments were control; application of humic acids; inoculation with Stenotrophomonas maltophilia; inoculation with Burkholderia cepacia; inoculation with S. maltophilia and B. cepacia; inoculation with S. maltophilia combined with application of humic acids; inoculation with B. cepacia combined with application of humic acids; inoculation with S. maltophilia and B. cepacia combined with application of humic acids. A total of 150 days after acclimatisation, the plants were biometrically and nutritionally evaluated. Inoculation with the bacterial strains separately promoted seedlings with greater N content; however, only inoculation with S. maltophilia, resulted in plants with more total dry matter in relation to the control. There was no response from application of humic acids in an isolated manner or in combination with the bacterial strains. The results indicate the biotechnological potential of the bacteria S. maltophilia in promoting the growth of the Cymbidium sp. orchid.
利用植物促生长细菌和腐植酸驯化兰花
兰花苗的离体驯化是一个缓慢的过程,可以通过植物生长促进微生物和腐殖质物质的使用来加速。本研究的目的是评估植物对植物生长促进菌和腐植酸接种的反应,以及它们在驯化期间的组合使用。处理为对照;腐植酸的应用;接种嗜麦芽窄养单胞菌;接种洋葱伯克氏菌;接种嗜麦芽葡萄球菌和洋葱芽孢杆菌;接种嗜麦芽葡萄球菌配合施用腐植酸;接种洋葱芽孢杆菌配合施用腐植酸;接种嗜麦芽葡萄球菌和洋葱芽孢杆菌并施用腐植酸。驯化后共150天,对植物进行生物计量学和营养评价。分别接种菌株可促进幼苗的氮含量提高;而只接种嗜麦芽葡萄球菌,植株的总干物质含量高于对照。单独施用腐植酸或与菌株联合施用腐植酸均无反应。结果表明,嗜麦芽葡萄球菌具有促进兰花生长的生物技术潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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