Journal
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
Volume 67, Issue 1, Pages 320-330Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.jafc.8b05851
Keywords
rhizobacteria; iron deficiency; spermidine; root colonization; arginine accumulation
Funding
- National Natural Science Foundation of China [31600210]
- Key Research Project of the Anhui Science and Technology Committee [16030701102]
- Natural Science Foundation of Education Department of Anhui province [KJ2018ZD051]
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Iron (Fe) deficiency often triggers arginine overproduction in plants. However, it remains elusive whether Fe deficiency-induced increases of arginine levels are involved in beneficial rhizobacteria recruitment and that the mechanism underlying rhizobacteria induced plant Fe deficiency tolerance. Here, Bacillus subtilis STU6 increased soluble Fe content in tomato, thereby alleviating Fe deficiency-induced chlorosis. In a split-root system, STU6 significantly induced arginine exudation by Fe-deficient roots, and increased arginine levels promoted spermidine (Spd) production by STU6 and bacterial colonization. Deletion of the STU6 speB gene inhibited Spd synthesis and abrogated STU6-induced increments of soluble Fe content in the Fe-deficient plants. Increased host Spd levels by STU6 greatly stimulated the NO accumulation in the Fe-deficient roots. Furthermore, disruption of NO signaling markedly repressed STU6-mediated cell wall Fe remobilization. Collectively, our data provide important evidence that chemical dialogues between tomato and STU6 contribute to enhancement of microbe-mediated plant adaptation to Fe deficiency.
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