Guangxi Cooperation and Innovation Center of Sugar Industry, Guangxi University, Nanning, Guangxi, China.
State Key Lab of Conservation and Utilization of Agric-Biological Resources, Guangxi University, Nanning, Guangxi, China.
PLoS One. 2018 May 10;13(5):e0196071. doi: 10.1371/journal.pone.0196071. eCollection 2018.
Development of easily defoliating sugarcane varieties is urgently needed to facilitate efficient mechanical harvesting, reduce production costs, and increase sugar yield in China. In order to quantify the defoliation characteristics of sugarcane, we investigated eight traits in two field experiments with a range of sugarcane varieties at maturity. The length (LSR) and angle (ASR) of the sheath ruptured from the stalk, defoliation force (DF), and self-defoliation (SD) were the traits with the greatest contribution to the quantitative assessment of sugarcane defoliation based on a principal component analysis, which accounted for more than 75% of the cumulative variability. A small set of traits, namely SD, ASR, and DF measured at the 10th leaf were selected as predictors. Using these predictors, 37 out of 38 sugarcane cultivars were correctly classified into three groups (easy, difficult and intermediate in terms of ease of defoliation) that had been clustered based on six traits. These simplified measurements will be applied to screen new lines in the sugarcane breeding program in China.
发展易脱叶的甘蔗品种对于促进中国甘蔗的高效机械收获、降低生产成本和提高糖分产量至关重要。为了量化甘蔗的脱叶特性，我们在两个田间试验中对一系列成熟甘蔗品种的 8 个特性进行了研究。基于主成分分析，基于茎秆断裂的叶鞘长度 (LSR) 和角度 (ASR)、脱叶力 (DF) 和自我脱叶 (SD) 是对甘蔗脱叶进行定量评估的最重要特征，占累积变异性的 75%以上。一小部分特性，即第 10 片叶测量的 SD、ASR 和 DF 被选为预测因子。使用这些预测因子，38 个甘蔗品种中的 37 个被正确地分为三组（易脱叶、难脱叶和中等脱叶），这三组是根据六个特性聚类的。这些简化的测量方法将应用于中国甘蔗育种计划中的新系筛选。
