Correlation between leaf structural traits and cold resistance in Saccharum officinarum L.
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摘要: 以广西农业科学院甘蔗(Saccharum officinarum L.)种质资源圃内收集自世界各蔗区的60份甘蔗育种材料为研究对象，对冬季低温时段凌晨光系统Ⅱ最大光化学效率(Fv/Fm)进行测定，并采集叶片作解剖结构、比叶面积、机械强度等性状的检测，以分析其结构特征与抗寒性之间的关联性。结果显示：冬季最冷时段，60份材料中，有55份表现出明显的寒害(Fv/Fm < 0.7)，其中35份材料凌晨Fv/Fm值< 0.6，受寒害较重；凌晨Fv/Fm与来源地最冷月最低温、冷季均温呈极显著线性负相关；Fv/Fm与叶肉组织厚度和机械强度(Fp)呈极显著线性正相关。耐寒性较强的甘蔗育种材料，叶肉组织厚度、机械强度均较大，因此叶片机械强度可以作为甘蔗耐冷品种筛选的重要指标。Abstract: In this study, we measured the predawn maximum photochemical efficiency of photosystem Ⅱ (Fv/Fm) in the leaves of 60 sugarcane breeding materials during an extreme low-temperature period. We also measured leaf anatomical structure, specific leaf area (SLA), and leaf resistance to punch (Fp), and analyzed the correlation between structural traits and cold tolerance. Results showed that during the coldest period in winter, 55 of the 60 samples showed cold damage (Fv/Fm < 0.7), including 35 cultivars with Fv/Fm < 0.6. Fv/Fm was negatively correlated with the lowest temperature in the coldest month and average temperature in the cold season of the source site of the breeding material. Fv/Fm was positively correlated with mesophyll thickness (MT) and leaf resistance to punch (Fp). We found that sugarcane cultivars with stronger cold tolerance had larger MT and Fp. Thus, Fp could be used as an important index for screening cold tolerance in sugarcane cultivars.
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