Jonathan T. D. Finch, Alexander Watson‐Lazowski, J. Cook
Context Monoecious plants can adjust their proportional investment in male and female flowers to maximise reproductive fitness. The female reproductive function (seeds) often has greater resource costs than the male (pollen). Larger plants are generally thought to have greater resource availability and should have a female biased sex ratio, referred to as the size-dependent selection hypothesis. However, empirical tests of this hypothesis have found mixed support. This may be because size alone is not always a reliable proximate value for resource availability, which can be influenced by other abiotic factors. Aims Breynia oblongifolia (Phyllanthaceae) is a perennial monoecious plant with unisexual moth-pollinated flowers from eastern Australia. Fruit production in Breynia is heavily influenced by rainfall, which is highly variable. We hypothesised that where soil moisture limits female function, Breynia would produce more male flowers (i.e. resource-dependent selection). Methods We used a multi-year observational dataset to look for evidence of resource-dependent flower sex ratios in a wild population and conducted a manipulative glasshouse experiment to test alternative hypotheses for flower sex selection. Key results In both our manipulative glasshouse experiment and observed wild population, decreasing soil water content resulted in higher proportions of male flowers, supporting the resource-dependent sex selection hypothesis. Conclusions Soil moisture influences flower sex ratios but plant size does not. Implications Future studies should not assume that height equates to resource wealth, as this is often overly simplistic and ignores the potential for key resources, like soil moisture or light, to fluctuate.
{"title":"Sex and flowers: testing the resource-dependent selection hypothesis for flower sex allocation","authors":"Jonathan T. D. Finch, Alexander Watson‐Lazowski, J. Cook","doi":"10.1071/bt22015","DOIUrl":"https://doi.org/10.1071/bt22015","url":null,"abstract":"Context Monoecious plants can adjust their proportional investment in male and female flowers to maximise reproductive fitness. The female reproductive function (seeds) often has greater resource costs than the male (pollen). Larger plants are generally thought to have greater resource availability and should have a female biased sex ratio, referred to as the size-dependent selection hypothesis. However, empirical tests of this hypothesis have found mixed support. This may be because size alone is not always a reliable proximate value for resource availability, which can be influenced by other abiotic factors. Aims Breynia oblongifolia (Phyllanthaceae) is a perennial monoecious plant with unisexual moth-pollinated flowers from eastern Australia. Fruit production in Breynia is heavily influenced by rainfall, which is highly variable. We hypothesised that where soil moisture limits female function, Breynia would produce more male flowers (i.e. resource-dependent selection). Methods We used a multi-year observational dataset to look for evidence of resource-dependent flower sex ratios in a wild population and conducted a manipulative glasshouse experiment to test alternative hypotheses for flower sex selection. Key results In both our manipulative glasshouse experiment and observed wild population, decreasing soil water content resulted in higher proportions of male flowers, supporting the resource-dependent sex selection hypothesis. Conclusions Soil moisture influences flower sex ratios but plant size does not. Implications Future studies should not assume that height equates to resource wealth, as this is often overly simplistic and ignores the potential for key resources, like soil moisture or light, to fluctuate.","PeriodicalId":8607,"journal":{"name":"Australian Journal of Botany","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-07-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45087648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Neil Ross – winner of the 2021","authors":"Dick Williams","doi":"10.1071/bt22045","DOIUrl":"https://doi.org/10.1071/bt22045","url":null,"abstract":"","PeriodicalId":8607,"journal":{"name":"Australian Journal of Botany","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-05-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48731574","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
M. Millar, R. M. Binks, Sarah‐Louise Tapper, B. Macdonald, S. McArthur, M. Hankinson, D. Coates, S. van Leeuwen, M. Byrne
{"title":"Historical persistence and isolation by distance of Mirbelia viminalis (Fabaceae) across the Hamersley Range of the Pilbara bioregion","authors":"M. Millar, R. M. Binks, Sarah‐Louise Tapper, B. Macdonald, S. McArthur, M. Hankinson, D. Coates, S. van Leeuwen, M. Byrne","doi":"10.1071/bt22014","DOIUrl":"https://doi.org/10.1071/bt22014","url":null,"abstract":"","PeriodicalId":8607,"journal":{"name":"Australian Journal of Botany","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58546927","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Vale Beth Gott, AM, MSc (Melb), PhD (Lond.) Plant Physiologist, Ethnobotanist, Teacher (25 July 1922 to 8 July 2022)","authors":"N. D. Hallam, Richard J. Williams","doi":"10.1071/bt22086","DOIUrl":"https://doi.org/10.1071/bt22086","url":null,"abstract":"","PeriodicalId":8607,"journal":{"name":"Australian Journal of Botany","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58548772","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. T. Draper, J. Stanhope, B. Simpson, P. Weinstein
{"title":"The distribution of dioecious plant pollination, sex ratio and seed dispersal research by climate type in Australia","authors":"J. T. Draper, J. Stanhope, B. Simpson, P. Weinstein","doi":"10.1071/bt21112","DOIUrl":"https://doi.org/10.1071/bt21112","url":null,"abstract":"","PeriodicalId":8607,"journal":{"name":"Australian Journal of Botany","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58546639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Stephen A. J. Bell, Phil Lamrock, H. Haines, C. Turney
{"title":"Multiple lines of evidence infer centurial-scale habitat change and resilience in a threatened plant species at Mount Dangar, Hunter Valley, New South Wales","authors":"Stephen A. J. Bell, Phil Lamrock, H. Haines, C. Turney","doi":"10.1071/bt22036","DOIUrl":"https://doi.org/10.1071/bt22036","url":null,"abstract":"","PeriodicalId":8607,"journal":{"name":"Australian Journal of Botany","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58547022","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"How important is fire-induced disturbance in the maintenance of a threatened perennial forb, Solanum papaverifolium?","authors":"O. Osazuwa, J. Dwyer, R. Fensham","doi":"10.1071/bt21146","DOIUrl":"https://doi.org/10.1071/bt21146","url":null,"abstract":"","PeriodicalId":8607,"journal":{"name":"Australian Journal of Botany","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58547165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Ian D. Darby, A. Wiegand, S. Hosseini Bai, H. Wallace, S. Trueman
{"title":"Synthetic seed propagation of the therapeutic-honey plants Leptospermum polygalifolium and L. scoparium (Myrtaceae)","authors":"Ian D. Darby, A. Wiegand, S. Hosseini Bai, H. Wallace, S. Trueman","doi":"10.1071/bt22025","DOIUrl":"https://doi.org/10.1071/bt22025","url":null,"abstract":"","PeriodicalId":8607,"journal":{"name":"Australian Journal of Botany","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58547200","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
J. Sampson, Sarah‐Louise Tapper, D. Coates, M. Hankinson, S. McArthur, M. Byrne
{"title":"Genetic diversity and differentiation in south-western Australian bloodwoods (Corymbia section Calophyllae, Myrtaceae) with different ranges and abundance","authors":"J. Sampson, Sarah‐Louise Tapper, D. Coates, M. Hankinson, S. McArthur, M. Byrne","doi":"10.1071/bt21081","DOIUrl":"https://doi.org/10.1071/bt21081","url":null,"abstract":"","PeriodicalId":8607,"journal":{"name":"Australian Journal of Botany","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58546687","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Warm stratification and optimised temperatures improve conservation of the endangered orchid, Caladenia robinsonii (Orchidaceae)","authors":"Brendan Janissen, A. Lawrie, T. Huynh","doi":"10.1071/bt21085","DOIUrl":"https://doi.org/10.1071/bt21085","url":null,"abstract":"","PeriodicalId":8607,"journal":{"name":"Australian Journal of Botany","volume":null,"pages":null},"PeriodicalIF":1.1,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"58546805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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