文献类型：期刊文献

英文题名：Reproductive biology and breeding system in Casuarina equisetifolia (Casuarinaceae) - implication for genetic improvement

作者：Zhang, Y.[1] Zhong, C. L.[1] Han, Q.[1] Jiang, Q. B.[1] Chen, Y.[1] Chen, Z.[1] Pinyopusarerk, K.[2] Bush, D.[2]

第一作者：张勇

通信作者：Zhong, CL[1]

机构：[1]Chinese Acad Forestry, Res Inst Trop Forestry, Guangzhou 510520, Guangdong, Peoples R China;[2]CSIRO Australian Tree Seed Ctr, GPO Box 1600, Canberra, ACT 2601, Australia

年份：2016

卷号：64

期号：2

起止页码：120-128

外文期刊名：AUSTRALIAN JOURNAL OF BOTANY

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000373708900004)】；

基金：This study was financially supported by the National Natural Science Foundation of China (Grant No. 31470634), Science and Technology Innovation Projects of Guangdong Forestry Bureau (2014JCX017), and the 12th National Five-Year Plan for Forestry Projects (2012BAD01 B0603). We are grateful to the anonymous reviewers who kindly provided very useful suggestions and comments on the manuscript.

语种：英文

外文关键词：floral longevity; pollination limitation; selfing rate; inbreeding depression

摘要：Understanding the reproductive biology of plant species is essential for successful domestication and genetic improvement programs. Casuarina equisetifolia L. is an important plantation species in China and India but information on reproductive biology is limited. To address this issue, grafted ramets of C. equisetifolia were used to study floral biology, breeding system and progeny performance. The female floral longevity of C. equisetifolia reached 28.4 days under non-pollination conditions, which was significantly longer than that of supplementary pollination (5.5 days) and open pollination (12.2 days), implying successful pollination would accelerate senescence of female flowers. Higher fruit set (88.8%) and seed set (35.7%) under supplementary pollination were obtained, compared with 75.9% and 21.7%, respectively, under open pollination, although there were no fruit set and seed set under non-pollination conditions. Pollen limitation was evident based on pollen limitation index (0.39) in seedling plantations of C. equisetifolia. Selfed seedlings had low height and diameter growth in both nursery and field trials and markedly lower survival in field trial, indicating inbreeding depression. Microsatellite-based estimates of selfing rate of open pollinated, monoecious individuals was 42%, suggesting that monoecious C. equisetifolia individuals are self-compatible, and that the breeding system should be classified as facultative xenogamy.