In the milk-mature stage of grain,the reproductive tillers of L. chinensis populations were sampled and their quantitative characteristics investigated and analyzed for both ploughed and enclosed plots. The results showed that in the same habitat,the height,ear length,inter-node length,spike node number and ratio of reproductive growth (RRG) of reproductive tillers were quite uniform and in order,but the ecological plasticity was relatively large for grain number,seed-setting percentage,number of florets and number of spikelets. Tiller height was very significantly positively correlated to both ear length and inter-node length,but was significantly negatively correlated to RRG. Ear length was significantly positively correlated to inter-node length,spike node number,number of spikelets and number of florets. Significant positive correlations were also found between spike node number and both spikelet number and floret number,between spikelet and floret numbers,and between grain number and both floret number and seed-setting percentage. The ecological plasticity of characteristics of L. chinensis reproductive tillers and their quantitative correlations revealed the natural laws for the individual to regulate its growth,development and reproduction. The number of grains per reproductive tiller was much higher in the ploughing plot than in the enclosed plot,largely because the increase of floret number with spikelet number and the increase of grain number with both floret number and seed-setting percentage were relatively allometric in the two plots.
Acta Prataculturae Sinica