Allocation to Reproduction and Relative Reproductive Costs in Two Species of Dioecious Anacardiaceae with Contrasting Phenology Export

@article{citeulike:2836613, abstract = {Background and AimsThe cost of reproduction in dioecious plants is often female-biased. However, several studies have reported no difference in costs of reproduction between the sexes. In this study, the relative reproductive allocation and costs at the shoot and whole-plant levels were examined in woody dioecious Rhus javanica and R. trichocarpa, in order to examine differences between types of phenophase (i.e. physiological stage of development). MethodsMale and female Rhus javanica and R. trichocarpa were sampled and the reproductive and vegetative allocation of the shoot were estimated by harvesting reproductive current-year shoots during flowering and fruiting. Measurements were made of the number of reproductive and total current-year shoots per whole plant, and of the basal area increment (BAI). The numbers of reproductive and total current-year shoots per 1-year-old shoot were counted in order to examine the costs in the following year at the shoot level. Key ResultsA female-biased annual reproductive allocation was found; however, the ratio of reproductive current-year shoots per tree and the BAI did not differ between sexes in Rhus javanica and R. trichocarpa. The percentage of 1-year-old shoots with at least one reproductive current-year shoot was significantly male-biased in R. trichocarpa, but not in R. javanica, indicating that there was a relative cost at the shoot level only in R. trichocarpa. The female-biased leaf mass per shoot, an indicator of compensation for costs, was only found in R. javanica. ConclusionsRelative reproductive costs at the shoot level were detected in Rhus trichocarpa, which has simultaneous leafing and flowering, but not in R. javanica, which has leafing followed by flowering. However, the costs for the whole-plant level were diminished in both species. The results suggest that the phenophase type may produce the different costs for R. javanica and R. trichocarpa through the development of a compensation mechanism. 10.1093/aob/mcn048}, author = {Matsuyama, Shuhei and Sakimoto, Michinori}, citeulike-article-id = {2836613}, citeulike-linkout-0 = {http://dx.doi.org/10.1093/aob/mcn048}, citeulike-linkout-1 = {http://view.ncbi.nlm.nih.gov/pubmed/18387971}, citeulike-linkout-2 = {http://www.hubmed.org/display.cgi?uids=18387971}, day = {3}, doi = {10.1093/aob/mcn048}, journal = {Ann Bot}, keywords = {dioecy, reproduction, reproductive-cost}, month = {April}, pages = {mcn048+}, posted-at = {2008-05-27 07:31:32}, priority = {2}, title = {Allocation to Reproduction and Relative Reproductive Costs in Two Species of Dioecious Anacardiaceae with Contrasting Phenology}, url = {http://dx.doi.org/10.1093/aob/mcn048}, year = {2008} }

TY - JOUR ID - citeulike:2836613 L3 - citeulike-article-id:2836613 N2 - Background and AimsThe cost of reproduction in dioecious plants is often female-biased. However, several studies have reported no difference in costs of reproduction between the sexes. In this study, the relative reproductive allocation and costs at the shoot and whole-plant levels were examined in woody dioecious Rhus javanica and R. trichocarpa, in order to examine differences between types of phenophase (i.e. physiological stage of development). MethodsMale and female Rhus javanica and R. trichocarpa were sampled and the reproductive and vegetative allocation of the shoot were estimated by harvesting reproductive current-year shoots during flowering and fruiting. Measurements were made of the number of reproductive and total current-year shoots per whole plant, and of the basal area increment (BAI). The numbers of reproductive and total current-year shoots per 1-year-old shoot were counted in order to examine the costs in the following year at the shoot level. Key ResultsA female-biased annual reproductive allocation was found; however, the ratio of reproductive current-year shoots per tree and the BAI did not differ between sexes in Rhus javanica and R. trichocarpa. The percentage of 1-year-old shoots with at least one reproductive current-year shoot was significantly male-biased in R. trichocarpa, but not in R. javanica, indicating that there was a relative cost at the shoot level only in R. trichocarpa. The female-biased leaf mass per shoot, an indicator of compensation for costs, was only found in R. javanica. ConclusionsRelative reproductive costs at the shoot level were detected in Rhus trichocarpa, which has simultaneous leafing and flowering, but not in R. javanica, which has leafing followed by flowering. However, the costs for the whole-plant level were diminished in both species. The results suggest that the phenophase type may produce the different costs for R. javanica and R. trichocarpa through the development of a compensation mechanism. 10.1093/aob/mcn048 JF - Ann Bot TI - Allocation to Reproduction and Relative Reproductive Costs in Two Species of Dioecious Anacardiaceae with Contrasting Phenology SP - mcn048 KW - dioecy KW - reproduction KW - reproductive-cost AU - Matsuyama, Shuhei AU - Sakimoto, Michinori PY - 2008/04/03/ UR - http://dx.doi.org/10.1093/aob/mcn048 ER -