摘要
为明确不同大豆品种叶片在3个关键的生殖生长时期4个主要光合生理指标对光合速率(Pn)的影响;明确高光效大豆品种的Pn高于低光效大豆品种的诸多影响因素;明确大豆叶片的Pn与几个农艺性状之间的密切关系。选用4个光合速率不同的大豆品种(两个高光效品种:黑农40、黑农41;一个中光效品种:黑农37;一个低光效品种:黑农26)于大豆的始荚期(R3)、始粒期(R5)、鼓粒期(R6)测定上述4个品种的光合速率(Pn)、气孔导度(Cond)、胞间CO2浓度(Ci)、蒸腾速率(Tr),并且通过Pn、Tr的观察值推算出水分利用率(WUE=Pn/Tr)。通过多元相关分析,研究了Cond等光合生理指标对Pn的影响,以及光合速率与农艺性状的相关性。结果表明:不同光合能力的大豆品种叶片的Pn在R3、R5、R6期分别与Cond、Tr呈极显著正相关;与Ci在3个生育时期大多呈微弱负相关;与WUE在R5期呈极显著正相关,在R3、R6期大多呈微弱正相关。但是,高光效品种在Pn与Cond、Ci、Tr及WUE的相关性方面比低光效品种密切。R5期大豆叶片的Pn与收获指数呈正相关,但不同光合水平大豆品种的Pn与单株重、单株粒重的相关性存在差异。
Photosynthetic rate is one of major factors affecting crop yield. It is the base for soybean high photosynthetic breeding to characterize the correlation between photosynthetic and agronomic traits. The parameters of soybean photosynthetic characteristics （Pn, Cond, Ci and Tr） were determined by four different photosynthetic rate cultivars（ two higher： Heinong 40, Heinong 41 ; one median ： Heinong 37 ; one lower： Heinong 26） in R3, R5 and R6 stages. The results indicated that the Pn was positively correlated with Cond and Tr in R3,R5 and R6 stages;it was little negative with Ci in three growth stages, a positively evident with WUE in R5 stage and a little negative in R3 and R6 stages. Results also showed that the Pn was more correlative closely with Cond, Ci, Tr and WUE in high photosynthetic efficiency cultivars than in lower ones. The correlative analysis between photosynthetic rate and main agronomic characters indicated that the Pn of leaf was positively correlated with harvest index in R5 stage, but the correlation between Pn and seed weight, yield per plant was different in different photosynthetic character varieties.
出处
《大豆科学》
CSCD
北大核心
2008年第3期397-401,共5页
Soybean Science
关键词
大豆
高光效
光合生理指标
农艺性状
相关性
Soybean
High photosynthetic efficiency
Photosynthetic characteristics
Agronomic characters
Correlation
