Molecular and Biological Agricultural Sciences Program, Taiwan International Graduate Program, Academia Sinica and National Chung Hsing University, Taipei 11529, Taiwan.
Department of Life Sciences, National Chung Hsing University, Taichung 40227, Taiwan.
Int J Mol Sci. 2021 Mar 19;22(6):3154. doi: 10.3390/ijms22063154.
To date, soil salinity becomes a huge obstacle for food production worldwide since salt stress is one of the major factors limiting agricultural productivity. It is estimated that a significant loss of crops (20-50%) would be due to drought and salinity. To embark upon this harsh situation, numerous strategies such as plant breeding, plant genetic engineering, and a large variety of agricultural practices including the applications of plant growth-promoting rhizobacteria (PGPR) and seed biopriming technique have been developed to improve plant defense system against salt stress, resulting in higher crop yields to meet human's increasing food demand in the future. In the present review, we update and discuss the advantageous roles of beneficial PGPR as green bioinoculants in mitigating the burden of high saline conditions on morphological parameters and on physio-biochemical attributes of plant crops via diverse mechanisms. In addition, the applications of PGPR as a useful tool in seed biopriming technique are also updated and discussed since this approach exhibits promising potentials in improving seed vigor, rapid seed germination, and seedling growth uniformity. Furthermore, the controversial findings regarding the fluctuation of antioxidants and osmolytes in PGPR-treated plants are also pointed out and discussed.
迄今为止，土壤盐渍化已成为全球粮食生产的巨大障碍，因为盐胁迫是限制农业生产力的主要因素之一。据估计，由于干旱和盐渍化，作物的大量损失（20-50%）将不可避免。为了应对这种严峻的情况，人们已经开发了许多策略，如植物育种、植物基因工程，以及各种农业实践，包括应用植物促生根际细菌（PGPR）和种子生物引发技术，以提高植物对盐胁迫的防御系统，从而提高作物产量，以满足未来人类不断增长的粮食需求。在本综述中，我们更新并讨论了有益的 PGPR 作为绿色生物接种剂的有利作用，通过多种机制减轻高盐条件对植物形态参数和生理生化特性的负担。此外，还更新并讨论了 PGPR 在种子生物引发技术中的应用，因为该方法在提高种子活力、快速种子萌发和幼苗生长均匀性方面表现出很大的潜力。此外，还指出并讨论了 PGPR 处理植物中抗氧化剂和渗透物波动的争议性发现。
