ABSTRACT

Drought is a major cause of the present decrease in crop yield and agricultural productivity around the globe. The disastrous effects of drought on plants call for a renewed concern on effective strategies to improve plant growth and yield under drought stress. This study was designed to evaluate the effectiveness of Arthrobacter arilaitensis and Streptomyces pseudovenezuelae to improve maize growth under drought stress at three soil moisture levels using two inoculation methods. Seven rhizosphere actinomycetes isolates were screened for the production of plant growth promoting (PGP) traits and it was observed that all isolates produced one or more PGP properties. The inoculated plants were not only protected from the deleterious effects of drought, but also showed significant increases in the physiological parameters measured. The findings of this study suggest that these isolates are important tools capable of being developed into bio-inoculants to effectively improve drought tolerance in plants.

摘要

干旱是当前全球农作物产量和农业生产力下降的主要原因。干旱对植物的灾难性影响使人们重新关注在干旱胁迫下改善植物生长和产量的有效策略。本研究旨在评估arilaitensis节杆菌和伪链霉菌的功效使用两种接种方法在三种土壤水分水平下改善干旱胁迫下的玉米生长。筛选了七个根际放线菌分离株以产生促进植物生长（PGP）的性状，并且观察到所有分离株均具有一种或多种PGP特性。接种的植物不仅免受干旱的有害影响，而且还显示出所测量的生理参数显着增加。这项研究的发现表明，这些分离株是重要的工具，能够被开发成生物接种剂，以有效提高植物的耐旱性。