Effects of low potassium stress on leaf photosynthesis and sucrose metabolism in sesame seedling stage

：［ Objective ］ To explore the response mechanisms of photosynthesis and leaf sucrose metabolism in sesame to low potassium （ K ） stress. ［ Method ］ The hydroponic experiment was conducted with the low-K sensitive cultivar Zhongzhi No. 9 （ ZZ9 ） and low-K tolerant WZM6 selected as the materials. The leaf net photosynthetic rate （ P n ）， stomatal conductivity （ G s ）， and the activities of 1 ， 5-ribulose diphosphate carboxylase （ Rubisco ）， sucrose phosphate synthase （ SPS ）， sucrose acid invertase （ SAI ）， sucrose synthase （ SuSy ） as well as the content of soluble sugar ， soluble protein ， sucrose ， starch of sesame seedlings were analyzed in response to low K and normal K conditions. ［ Result ］ Compared with the normal K treatment ， the P n ， G s ， and activities of Rubisco ， SPS ， SuSy and soluble protein content of the ZZ9 cultivar significantly decreased by 22.0% ， 18.2% ， 40.0% ， 24.0% ， 7.9% and 25.5% respectively ； while the contents of soluble sugar ， sucrose ， starch and SAI activity in leaves significantly increased by 110.0% ， 61.2% ， 38.1% and 8.1% respectively.The WZM6 cultivar showed smaller variations in leaf photosynthetic capacity and sucrose metabolism-related indicators under low K stress.Additionally ， the absolute values of the stress coefficients of various physiological indicators of the low K-sensitive ZZ9 cultivar were higher than those of the low K-tolerant WZM6 cultivar ， indicating that ZZ9 was more severely affected by low K stress. ［ Conclusion ］ Low K stress affects the growth and development of sesame seedlings by weakening photosynthesis ， hindering the transport of photosynthetic products and interfering with the carbon metabolism pathway. The activities of sucrose metabolic enzymes ， photosynthetic capacity and osmotic adjustment substances are more sensitive to K nutrition levels in ZZ9 ， while these indicators were minor changed by low-K stress in WZM6.

• Publication year

  2026

• Venue

  ACTA AGRICULTURAE UNIVERSITATIS JIANGXIENSIS

• Publication date

  2026-02-01

• Fields of study

  Not labeled

• Identifiers
  DOI 10.3724/aauj.2026004
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

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• No concepts are published for this paper.

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