Drought priming promotes phloem loading-driven sucrose export to alleviate the photosynthetic limitations under low nitrogen stress in wheat seedlings

cmax) and activities of Rubisco and Rubisco activase (RCA). Furthermore, drought priming promoted triose phosphate (TP) utilization and upregulated the expression of sugar transporter genes, which reduced sucrose accumulation in leaves and consequently alleviated its feedback inhibition on photosynthesis. In summary, drought priming enhances phloem loading-driven sucrose transport, reduces leaf sucrose accumulation, and improves Rubisco activation, collectively alleviating photosynthetic feedback inhibition and sustaining stronger photosynthetic capacity under low N stress.