Barley (Hordeum vulgare), which tolerates iron (Fe) deficiency, secretes a large amount of phytosiderophores from its roots. However, how barley is able to allocate resources for phytosiderophore synthesis when the carbon assimilation rate is reduced by Fe deficiency is unknown. We previously suggested that the acceleration of senescence in older leaves triggered by Fe deficiency may allow the recycling of assimilates to contribute to phytosiderophore synthesis. In this work, we show the relationship between an increase in the C/N ratio in older leaves and Fe-deficiency tolerance among three barley cultivars. The increase in the C/N ratio suggests an enhanced capacity for the retranslocation of carbohydrates or amino acids from older leaves to the sink organs. An increase in the sucrose concentration in Fe-deficient barley also suggests active redistribution of assimilates. This metabolic modulation may be supported by accelerated senescence of older leaves, as Fe deficiency increased the expression of senescence-associated genes. The older leaves of Fe-deficient barley maintained CO2 assimilation under Fe deficiency. Barley that had been Fe-deficient for 3 days preferentially allocated newly assimilated (13) C to the roots and nutrient solution. Interestingly, the oldest leaf of Fe-deficient barley released more (13) C into the nutrient solution than the second oldest leaf. Thus, the balance between anabolism and catabolism in older leaves, supported by highly regulated senescence, plays a key role in metabolic adaptation in Fe-deficient barley.

A 24-year-old woman at 38 weeks of gestation with no past medical history was transferred to our hospital because of acute onset of severe dyspnea. Her conscious level was E4V2M5 on the Glasgow Coma Scale and she displayed stress cardiomyopathy (Takotsubo cardiomyopathy) with multiple organ failure. Intrauterine fetal death was confirmed. After immediate application of intubated ventilation, percutaneous cardiopulmonary support and hemodialysis, she was diagnosed with pheochromocytoma multisystem crisis. After multidisciplinary team discussion, surgical resection of the left pheochromocytoma was performed on the same day. However, the bleeding from retroperitoneal drainage did not decrease, therefore, on the fourth day of hospitalization, embolization of the left renal artery under angiography was performed. A 2774 g female infant was stillborn spontaneously on the seventh day of hospitalization. Percutaneous cardiopulmonary support was discontinued on the fifth day of hospitalization and the tracheal tube was extubated on the 11th day. The patient was discharged after 30 days.

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