Pea (Pisum sativum L.) produces seeds rich in proteins, but seed yield and quality remain unstable due to various stresses, including drought and sulfur deficiency that interact in the context of climate change and reduced sulfur deposition. To investigate the interplay between sulfur nutrition and drought, sulfate-deprived pea plants were subjected to a short water-stress of 9 days during the early reproductive phase. While drought alone did not impact seed yield, sulfur deficiency alone or combined with drought decreased it by 38% and 65% respectively. An analysis of the seed protein composition revealed differences in the accumulation of sulfur-rich (11S) and sulfur-poor (7S) globulins in response to individual or combined stresses. Whil...