Wei Yibin, Xu Yuzhi, Khan Abdullah, Jiang Chunxiu, Li Huojian, Wu Yuling, Zhang Chi, Wang Maoyao, Chen Jun, Zeng Lifang, Zhang Muqing
College of Agriculture, Guangxi University, Nanning 530004, China.
Guangxi Key Laboratory of Sugarcane Biology & State Key Laboratory for Conservation and Utilization of Subtropical Agro-Bioresources, Guangxi University, Nanning 530004, China.
Plants (Basel). 2024 Feb 22;13(5):587. doi: 10.3390/plants13050587.
Sugarcane is a globally significant crop for sugar and energy production, and developing high light-efficiency sugarcane varieties is crucial for enhancing yield and quality. However, limited research is available on the screening of sugarcane germplasm with high photosynthetic efficiency, especially with different leaf positions. The present study, conducted in Guangxi, China, aimed to analyze the photosynthetic characteristics of 258 sugarcane varieties at different leaf positions over three consecutive years in field experiments. The results showed significant differences in photosynthetic characteristics among genotypes, years, and leaf positions. Heritability estimates for various photosynthetic parameters ranged from 0.76 to 0.88. Principal component analysis revealed that the first three principal components accounted for over 99% of the cumulative variance. The first component represented photosynthetic efficiency and light utilization, the second focused on electron transfer and reaction center status, and the third was associated with chlorophyll content. Cluster and discriminant analysis classified sugarcane genotypes into three categories: high photosynthetic efficiency (HPE) with 86 genotypes, medium photosynthetic efficiency (MPE) with 60 genotypes, and low photosynthetic efficiency (LPE) with 112 genotypes. Multi-year trials confirmed that HPE sugarcane genotypes had higher single-stem weight and sucrose content. This study provides valuable insights into the photosynthetic physiological characteristics of different sugarcane varieties, which can contribute to further research regarding high yields and sugar breeding.
甘蔗是全球重要的制糖和能源作物，培育高光效甘蔗品种对于提高产量和品质至关重要。然而，关于光合效率高的甘蔗种质筛选，尤其是不同叶位的相关研究有限。本研究在中国广西开展，旨在通过田间试验连续三年分析258个甘蔗品种在不同叶位的光合特性。结果表明，基因型、年份和叶位之间的光合特性存在显著差异。各种光合参数的遗传力估计值在0.76至0.88之间。主成分分析表明，前三个主成分占累积方差的99%以上。第一成分代表光合效率和光利用，第二成分聚焦于电子传递和反应中心状态，第三成分与叶绿素含量相关。聚类和判别分析将甘蔗基因型分为三类：高光效（HPE）86个基因型、中光合效率（MPE）60个基因型和低光合效率（LPE）112个基因型。多年试验证实，HPE甘蔗基因型具有更高的单茎重和蔗糖含量。本研究为不同甘蔗品种的光合生理特性提供了有价值的见解，有助于进一步开展高产和蔗糖育种研究。
