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Supplemental irrigation at jointing improves spike formation of wheat tillers by regulating sugar distribution in ear and stem

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  • Shang, Yunqiu
  • Wang, Sen
  • Lin, Xiang
  • Gu, Shubo
  • Wang, Dong

Abstract

Irrigation at jointing increases spike numbers at wheat harvest, but the mechanisms underlying increased tiller spike formation rate (SR) during wheat production caused by irrigation have remained unclear. We therefore designed the supplemental irrigation (SI) treatments at jointing in which SI was received (SIJ) or did not receive (NSI) by wheat, and analyzed the morphological differentiation of young ears and physiological responses of young ears and stems to SI. Results shown that SIJ relative to NSI mainly improved the SR of the first primary tiller (T1) and second primary tiller (T2), which significantly increased the grain yield. The tillers SR positively correlated to the soluble sugar and sucrose contents in young ears, but negatively correlated to that in stems. SIJ significantly increased the soluble sugar and sucrose contents in young ears and reduced that in stems in both the main stem (MS) and tillers. Compared with MS, the young ear differentiation of T1 and T2 tillers that can form spikes was always behind by 0–2 developmental periods between jointing and flowering. Although SIJ decelerated the young ears differentiation of the MS and the T1 tiller, the increased sugar content in young ears causing a significant increase in grain numbers. Moreover, SIJ positively regulated the young ear differentiation of T2 tiller with more sucrose contained in young ears and less in stems to narrow gaps in young ear differentiation between T2 tiller and MS. Some T1 and T2 as well as other high-position tillers composed invalid tillers, where young ears mostly ceased differentiating at the stages of glume primordium present to carpel primordium present, and contained significantly less sugar than effective tillers. Significant morphological differences in young ears and nutritional physiological differences in tillers led to high-position tillers that were difficult to convert into effective tillers even under favorable conditions by SIJ. Overall, tillers can be converted into effective spikes by increasing sugar metabolism in young ears via SIJ when the discrepancy in young ear differentiation does not exceed two developmental stages compared to MS.

Suggested Citation

  • Shang, Yunqiu & Wang, Sen & Lin, Xiang & Gu, Shubo & Wang, Dong, 2023. "Supplemental irrigation at jointing improves spike formation of wheat tillers by regulating sugar distribution in ear and stem," Agricultural Water Management, Elsevier, vol. 279(C).
    • Handle: RePEc:eee:agiwat:v:279:y:2023:i:c:s0378377423000252
    DOI: 10.1016/j.agwat.2023.108160
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    References listed on IDEAS

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    1. Li, Jinpeng & Zhang, Zhen & Liu, Yang & Yao, Chunsheng & Song, Wenyue & Xu, Xuexin & Zhang, Meng & Zhou, Xiaonan & Gao, Yanmei & Wang, Zhimin & Sun, Zhencai & Zhang, Yinghua, 2019. "Effects of micro-sprinkling with different irrigation amount on grain yield and water use efficiency of winter wheat in the North China Plain," Agricultural Water Management, Elsevier, vol. 224(C), pages 1-1.
    2. Agami, Ramadan A. & Alamri, Saad A.M. & Abd El-Mageed, T.A. & Abousekken, M.S.M. & Hashem, Mohamed, 2018. "Role of exogenous nitrogen supply in alleviating the deficit irrigation stress in wheat plants," Agricultural Water Management, Elsevier, vol. 210(C), pages 261-270.
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