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Chinese Agricultural Science Bulletin ›› 2025, Vol. 41 ›› Issue (5): 13-22.doi: 10.11924/j.issn.1000-6850.casb2023-0647

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Photosynthetic Characteristics of BC3F1 Lines of Intergeneric Hybrids Between Erianthus arundinaceus and Saccharum

CAI Weijun1(), HE Yongding2, LI Hongbo2, ZHAO Xiaofeng2, SHEN Wankuan2()   

  1. 1 Zhanjiang Academy of Agricultural Sciences, Zhanjiang, Guangdong 524094
    2 Sugarcane Laboratory, South China Agricultural University, Guangzhou 510642
  • Received:2023-09-22 Revised:2024-07-16 Online:2025-02-15 Published:2025-02-11

Abstract:

In order to evaluate the photosynthetic characteristics of the BC3F1 lines derived from intergeneric hybrids between Erianthus arundinaceus and Saccharum, 14 BC3F1 lines bred by the sugarcane research laboratory of South China Agricultural University were used as experimental materials. Chlorophyll and photosynthetic instruments were used to measure the chlorophyll content, stomatal conductance (Gs), net photosynthetic rate (Pn), intercellular CO2 concentration (Ci), and transpiration rate (Tr) of sugarcane leaves in one-year new planting and one-year ratoon field experiments. The results showed that the leaf chlorophyll content, Gs, Pn and Tr of 14 BC3F1 lines and the control (Liucheng 05-136) showed an upward trend at seedling stage, tillering stage and jointing stage, while the Ci showed a downward trend with the development of growth stage. Among them, the chlorophyll content, Gs, Pn and Tr of new planting and ratoon of five lines (HE15-30, HE15-71, HE15-77, HE15-61 and HE15-63) were higher than CK at three growth stages, while Ci was lower than CK. In summary, this study identified five BC3F1 lines with excellent photosynthetic characteristics, providing a pathway for the innovation of sugarcane high photosynthetic efficiency germplasm or parents.

Key words: sugarcane, Erianthus arundinaceus, intergeneric hybridization, photosynthetic characteristics, BC3F1 lines