Photosynthetica 2018, 56(2):520-526 | DOI: 10.1007/s11099-017-0707-2
Effect of weedy rice at different densities on photosynthetic characteristics and yield of cultivated rice
- 1 College of Life Sciences, Nanjing Agricultural University, Nanjing, China
- 2 Institute of Plant Protection, Jiangsu Academy of Agricultural Sciences, Nanjing, China
In order to evaluate effect of weedy rice on the photosynthesis and grain filling of cultivated rice, cultivated rice 'Nanjing 44' was planted in the field under different densities of weedy rice 'JS-Y1' for two years. The results showed that net photosynthetic rate (PN), net assimilation rate, grain filling rate, and the grain yield of cultivated rice all decreased with increasing weedy rice density. Furthermore, yield component analysis revealed that increasing weedy rice density had the most significant effect on the percentage of filled grains and the number of rice panicles. The correlation analyses indicated that the yield of cultivated rice was highly correlated with the net photosynthetic rate and the net assimilation rate. Our results illustrated that high density of weedy rice might cause yield losses in cultivated rice by inhibition of photosynthesis and grain filling.
Additional key words: chlorophyll fluorescence; density; gas exchange; Oryza sativa; weedy rice; yield
Received: June 24, 2016; Accepted: January 6, 2017; Published: June 1, 2018 Show citation
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