Alginate oligosaccharide (AOS) is a degradation product of alginates extracted from marine brown algae, which play an important role in growth-promotion when it was first discovered, such as enhancing cell proliferation and differentiation thus leading to shoot elongation in higher plants . More studies subsequently demonstrated the ability of AOS to promote seed germination, root development and yield increase of maize.
Here researchers used alginate oligosaccharide (AOS) and coronatine (COR) to investigate the effects of these two PGRs on maize drought tolerance in a two-year field experiment. In maize seedlings, both PGRs significantly reduced leaf water loss and protected cell membranes there by improving the drought tolerance of maize seedlings, but did not restore them to the levels under well-watered conditions.The improvement in maize seedling laid the foundation for increasing drought tolerance in reproductive growth period, thus COR and AOS treatments improved the drought tolerance of maize in the reproductive stage by alleviating the inhibitory effects of drought stress on photo-synthesis, above-ground growth and final grain yields. Furthermore, both PGRs increased final yields by increasing TKW. However, COR treatment mainly promoted relative chlorophyll contents (SPAD values) and AOS treatment mainly increased dry matter accumulation under drought conditions.
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