Dynamics of photoassimilates in the stem internodes of rainfed barley cultivars grown under regions with different climate

Joudi, Mehdi; Mehraban, Asghar

doi:10.22059/jci.2025.389854.2916

Document Type : Research Paper

Authors

Mehdi Joudi ¹
Asghar Mehraban ²

¹ Department of Plant Science and Medicinal Herbs, Meshgin-Shahr Faculty of Agriculture- University of Mohaghegh Ardabili, Ardabil, Iran

² Ardabil Agricultural and Natural Resources Research and Education Center, Agricultural Research, Education and Extension Organization (AREEO), Ardabil, Iran.

10.22059/jci.2025.389854.2916

Abstract

Objective: This research aimed to investigate the potential of photoassimilate accumulation and remobilization in the stem internodes of rainfed barley cultivars grown in regions with contrasting climates.
Method: Eight barley cultivars (four two-rowed and four six-rowed) were cultivated under rainfed conditions in Meshginshahr (Mediterranean region with cold winters) and Jafarabad-Moghan (semi-tropical region with semi-cold winters) during the 2023–2024 growing season. Photoassimilate accumulation and remobilization were assessed in the stem internodes (peduncle, penultimate, and lower internodes) by measuring changes in dry weight.
Results: The two experimental sites exhibited distinct climatic conditions. Meshginshahr experienced higher precipitation and lower average temperatures, resulting in a longer growing season compared to Moghan. Internode length varied: the upper internodes (peduncle and penultimate) were longer in Meshginshahr, while the lower internodes contributed a higher proportion to total stem length in Moghan. The maximum dry weights of the peduncle, penultimate, and lower internodes in Meshginshahr were observed at 18, 18, and 15 days after anthesis, respectively; in Moghan, these maxima occurred at 4, 4, and 4 days after anthesis. Internodes in Meshginshahr accumulated greater amounts of photoassimilates, exhibited higher remobilization of reserves, and supported higher grain yields per stem than those in Moghan. Significant variability was observed among cultivars across morphologic, physiological, and agronomic traits. Generally, cultivar× location interactions were non-significant for maximum internode weight and specific weight, indicating consistent cultivar rankings across sites despite trait variations. Notably, Barzin and Jolgeh exhibited the highest internode weights and specific weights in Meshginshahr and Moghan, respectively. However, complex interactions were observed for internode and stem remobilization, with location influencing both trait values and cultivar rankings. Jolgeh and Barzin in Meshginshahr, and Barzin and Oxin in Moghan, demonstrated the highest cumulative remobilization.
Conclusions: In both regions, lower internodes showed the greatest potential for accumulation and remobilization of photoassimilates. To maximize dry matter accumulation early in the season and facilitate effective remobilization toward grain filling, these internodes should ideally possess appropriate length, weight, and specific weight. These findings suggest that selecting cultivars with optimal lower internode traits could improve yield potential in rainfed barley cultivation under variable climatic conditions

Keywords

References

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Journal of Crops Improvement

Dynamics of photoassimilates in the stem internodes of rainfed barley cultivars grown under regions with different climate

References

References

References

Volume 27, Issue 3
September 2025
Pages 397-415

Dynamics of photoassimilates in the stem internodes of rainfed barley cultivars grown under regions with different climate

References

References

References

Volume 27, Issue 3September 2025Pages 397-415

Volume 27, Issue 3
September 2025
Pages 397-415