Sexual reproduction, life history, and early development in culture of the Antarctic brown alga Himantothallus grandifolius (Desmarestiales, Phaeophyceae
Sexual reproduction, life history, and early development in culture of the Antarctic brown alga Himantothallus grandifolius (Desmarestiales, Phaeophyceae
复制标题
南极褐藻Himantothallus grandifolius（Desmarestiales，褐藻纲）的有性繁殖、生活史和早期培养发育
DOI：
--
复制
发表时间：
1990
期刊：
影响因子：
--
通讯作者：
M. Clayton
中科院分区：
文献类型：
--
作者：
C. Wiencke;M. Clayton
摘要本文报道了大花神（Himantothallus trifolius）孢子体的生活史和早期发育情况。单室孢子囊生于顶生的两细胞茎上，间或有胞丝。减数孢子发育成雌雄异株的微观配子体。雄性配子体细胞较小，叶绿体较少；雌性配子体细胞较大，叶绿体较多。卵原体和卵，或精子在短时间内形成，每个卵子都有一个单一的精子。孢子体由受精卵或孤雌生殖发育而来。起初，它们是单生的，有胚层间分生组织。随后，侧叶成对形成，其中一些发育为基部茎间分生组织，最终形成侧叶。末端叶片起源于主轴。幼叶形成一个中心空腔，随后充满不同类型的皮层细胞。桔梗的生活史，特别是配子体的特征具有典型的桔梗目配子体的特征。
Abstract The life history and early development of the sporophyte of Himantothallus grandifolius is reported. Unilocular sporangia are borne terminally on two-celled stalks interspersed with paraphyses. Meiospores develop into dioecious microscopic gametophytes. Male gametophytes have relatively small cells with few chloroplasts, cells of female gametophytes are larger and contain numerous chloroplasts. Oogonia and eggs, or antheridia each with one single spermatozoid are formed in short days. Sporophytes develop from fertilized eggs or parthenogenetically. At first they are uniseriate with an intercalary meristem. Subsequently laterals are formed in pairs, some of which develop basal intercalary meristems and eventually form lateral blades. The terminal blade originates from the main axis. In juvenile blades a central cavity is formed which is later filled with different types of cortical cells. The life history of H. grandifolius and in particular the character of the gametophytes is typical of the orde...