Physiological characteristics of South China double cropping super high-yielding rice at active tiilering stage
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摘要: 在早、晚季水稻分蘖盛期,测定了华南稻区6个不同类型超高产水稻品种(组合)的干物重、功能叶叶绿素(a+b)含量、叶面积指数、根系活力和净光合速率等主要生理性状,并应用数理统计方法分析了品种(组合)间各性状的差异显著性及对干物重的综合作用,以及早、晚季不同生态环境对上述生理性状的影响·提出华南双季超高产水稻动态株型育种中分蘖盛期适宜的生理指标量值为:功能叶叶绿素(a+b)含量早季3.9～4.2nlg·g-1 、晚季4.0 mg·g-1。根系活力早季270～348pg·g1·h-1、晚季318μh-1·g-1·h1,叶面积指数早季2.4～2.7、晚季3.8,功能叶净光合速率早季24.8μmol·m2·s1、晚季23.3μmol·m-2·s-1。Abstract: The main physiological characteristics of six South China super high-yielding rice varieties(combinations).including dry matter weight,chlorophyll contents(a+b)of the functional leaves.leaf area index(LAI),root activity and net photosynthetic rate were measured at the active tillering stage in both early and latecrops.The significance of difference among these physiological characteristics and the effects of these physiologicalcharaetenstics to dry matter weight,and the effects of different environments between early and late crops wereanalyzed by using statistics methods.The required physiological values at the active tillering stage for dynamicplant type breeding of South China double cropping super high-yielding rice were put forward.They were 3.9-4.2mg·g-1in the early crop and 4.0 mg·g-1m the late crop for the ideal chlorophyll contents(a and b)of thefunctional leaves.270—348/μg·g-1·h-1in the early crop and 318 μg·g-1·h-1in the late crop for the ideal rootactivity.2.4-2.7 in the early crop and 3.8 in the late crop for the ideal leaf area mdex.24.8 μmol·m2·s1 inthe early crop and 23.3μmol·m2·s1 in the late crop for the ideal net photosynthetic rate of functional leaves.
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