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http://hdl.handle.net/2239/46091
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| Title: | Reproductive Allocation Patterns in Different Density Populations of Spring Wheat |
| Authors: | Liu, Jing
Wang, Gen-Xuan
Wei, Liang
Wang, Chun-Ming |
| Keywords: | 春小麦(Wheat)
栽种密度(density)
竞争机制(competition)
栽培技术(reproductive allocation) |
| Issue Date: | Feb-2008 |
| Publisher: | 《植物学报：英文版》2008，50（2）：141-146. |
| Abstract: | [英文摘要]： The effects of increased intraspecific competition on size hierarchies （size inequality） and reproductive allocation were investigated in populations of the annual plant, spring wheat （Triticurn aestivurn）. A series of densities （100, 300, 1 000, 3 000 and 10 000 plants/m^2） along a gradient of competition intensity were designed in this experiment. The results showed that average shoot biomass decreased with increased density. Reproductive allocation was negatively correlated to Gini coefficient （R^2 = 0.927）, which suggested that reproductive allocation is inclined to decrease as size inequality increases. These results suggest that both vegetative and reproductive structures were significantly affected by intensive competition. However, results also indicated that there were different relationships between plant size and reproductive allocation pattern in different densities. In the lowest density population, lacking competition （100 plants/m^2）, individual reproductive allocation was size independent but, in high density populations （300, 1 000, 3 000 and 10 000 plants/m^2）, where competition occurred, individual reproductive allocation was size dependent： the small proportion of larger individuals were winners in competition and got higher reproductive allocation （lower marginal reproductive allocation; MRA）, and the larger proportion of smaller individuals were suppressed and got lower reproductive allocation （higher MRA）. In conclusion, our results support the prediction that elevated intraspecific competition would result in higher levels of size inequality and decreased reproductive allocation （with a negative relationship between them）. However, deeper analysis indicated that these frequency- and size-dependent reproductive strategies were not evolutionarily stable strategies. |
| URI: | http://hdl.handle.net/2239/46091 |
| Appears in Collections: | 科学论文
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