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- W3143669647 abstract "Abstract High relative humidity (RH) perturbs plant growth, stomatal functioning and abscisic acid (ABA) homeostasis, but the role of ABA in this physiological regulation is equivocal. To determine the role(s) of ABA in plant responses to high RH, wild‐type (WT) tomato and barley plants and their respective ABA‐deficient mutants flacca and Az34 (which are mutated in the same locus of the ABA biosynthesis pathway) were grown in contrasting RHs (60% and 90%) to measure biomass partitioning, stomatal traits and water relations. Surprisingly, growth RH did not affect foliar ABA levels in either species. While Az34 showed similar stomatal size and density as WT plants, flacca had larger and more abundant stomata. High RH increased stomatal size in tomato, but decreased it in barley, and decreased stomatal density in tomato, but not in barley. Altered stomatal responses in ABA‐deficient plants to high RH had little effect on tomato photosynthesis, but Az34 barley showed lower photosynthesis. ABA deficiency decreased relative shoot growth rate (RGR SHOOT ) in both species, yet this was counteracted by high RH increasing leaf water status in tomato, but not in barley. High RH increased RGR SHOOT in flacca , but not in WT tomatoes, while having no effect on RGR SHOOT in barley, but affecting barley net assimilation rate, leaf area ratio (LAR) and specific leaf area in an ABA‐dependent manner. ABA‐RH interaction affected leaf development in tomato only. Thus, different crop species show variable responses to both high RH and ABA deficiency, making it difficult to generalise on the role of ABA in growth regulation at contrasting RHs." @default.
- W3143669647 created "2021-04-13" @default.
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- W3143669647 date "2021-05-06" @default.
- W3143669647 modified "2023-10-17" @default.
- W3143669647 title "Different abscisic acid‐deficient mutants show unique morphological and hydraulic responses to high air humidity" @default.
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- W3143669647 doi "https://doi.org/10.1111/ppl.13417" @default.
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