Seed storage behaviour and seed germination in African and Malagasy baobabs (Adansonia species)
Seed storage behaviour and seed germination in African and Malagasy baobabs (Adansonia species)
复制标题
非洲和马达加斯加猴面包树（Adansonia 种）的种子储存行为和种子发芽
作者：
J. H. Razanameharizaka;M. Grouzis;D. Ravelomanana;P. Danthu
猴面包树属在非洲有7种，其中6种是马达加斯加特有的。根据物种的不同，猴面包树生长在各种各样的生态系统中，包括干旱地区和大草原，以及干燥和潮湿的森林。所有物种的种子都表现出正统的行为，能够忍受脱水至5%左右的水分含量。属短叶螨科的A.桔梗和A. suarezensis均不存在生理休眠。他们的种子在没有任何事先损伤的情况下发芽。其他5种，属于Adansonia和longitude部分，种子有不透水的外壳。其中，马地蒿和马地蒿的不透水种子比例约为2 / 3，而马地蒿、马达加斯加蒿和毛蕊蒿的不透水种子比例约为90%。与其他物种相比，马达加斯加稻蛾需要采取更严格的治疗措施来消除生理休眠。然而，似乎不可能将这些特征和种间差异与这些物种适应环境的策略联系起来。
The Adansonia (baobab) genus comprises seven species in Africa, six of which are endemic to Madagascar. Depending on the species, baobabs develop in widely varying ecosystems, including arid zones and savannahs, as well as dry and wet forests. Seeds from all species exhibited orthodox behaviour, tolerating dehydration to a moisture content of around 5%. There was no physical dormancy in the two species belonging to the Brevitubae section, A. grandidieri and A. suarezensis. Their seeds germinated without any prior scarification. The five other species, belonging to Adansonia and Longitubae section, have seeds with water-impermeable coats. In the case of A. digitata and A. za, the proportion of water-impermeable seeds was around two-thirds, whereas with A. rubrostipa, A. madagascariensis and A. perrieri, the proportion was >90%. Treatments allowing for the removal of physical dormancy needed to be markedly more severe with A. madagascariensis than with the other species. None the less, it seems impossible to link these characteristics and the interspecific differences to a strategy for adaptation by these species to their environment.