Late spring cold reduces grain number at various spike positions by regulating spike growth and assimilate distribution in winter wheat

• DOI: 10.1016/j.cj.2023.03.014
• Publication Date: 2023-05-04T01:17:04Z
• Authors: Feifei Lin; Cheng Li; Bo Xu; Jian Chen; Anheng Chen; Muhammad A. Hassan; Binbin Liu; Hui Xu; Xiang Chen; Jianqiang Sun; Jincai Li
• Keywords: Glume; Fructification

Late spring cold (LSC) occurred in the reproductive period of wheat impairs spike and floret differentiation during period, when young spikelets are very cold-sensitive. However, under LSC, responses at various positions, leaves, stems interactions between them physiological levels remain unclear. In present study, two-year treatments terminal spikelet stage two temperatures (2 °C, −2 °C) durations (1, 2, 3 days) were imposed an artificial climate chamber to compare effects LSC on grain number yield cultivars Yannong 19 (YN19, cold-tolerant) Xinmai 26 (XM26, cold-sensitive). The night temperature regimes designed reproduce natural variation. delayed plant growth inhibited differentiation, leading high losses both cultivars. reduced dry matter accumulation (DMA, g) spikes, stems, reducing DMA ratios leaf stem. Plant cell wall invertase (CWINV) activity increased upper basal YN19, whereas CWINV middle XM26. Under soluble sugar glucose transported distributed mainly for glume rachis development, so that development was relatively complete severely damaged most glumes completely developed XM26, resulting pollen abortion spikelets. rachides influenced per decreased after with kernels Overall, total partitioning spikes results poor yield.