关键词: 甘蓝型油菜（Brassica napus L.）, 芥菜型油菜（Brassica juncea L.）, 白菜型油菜（Brassica campestris L.）, 净光合速率, 农艺性状

Abstract: Forty-four different types of rapeseed were used as materials. The photosynthetic indices, chlorophyll content and green leaf area were measured at the initial flowering stage, and the agronomic traits were investigated at the mature stage. The photosynthetic characteristics of different types of rapeseed and their correlation with agronomic traits were analyzed, and materials with high net photosynthetic efficiency were screened out. The results showed that the chlorophyll content and net photosynthetic rate at the initial flowering stage were in the order of introduced Brassica napus>Brassica juncea > local Brassica napus>Brassica campestris. The net photosynthetic rate of the 44 materials ranged from 2.20 to 11.47 μmol/(m²·s), showing a skewed normal distribution. The net photosynthetic rate of most materials was 4~6 μmol/(m²·s), accounting for 47% of the total materials. Correlation analysis showed that the net photosynthetic rate at the initial flowering stage was significantly positively correlated with plant height, branching position and number of siliques per plant, with correlation coefficients of 0.426, 0.340 and 0.289, respectively. Three materials with high net photosynthetic rate at the initial flowering stage were screened out, which were introduced Brassica napus variety Y16, and Brassica juncea varieties “94 (08)” and “98 (02)”, with net photosynthetic rates of 11.47, 10.33 and 11.04 μmol/(m²·s) respectively.

Key words: Brassica napus L., Brassica juncea L., Brassica campestris L., net photosynthetic rate, agronomic traits