籼型光敏雄性不育水稻杂种花粉植株游离小孢子培养成植株

禾本科植物游离小孢子的培养已在水稻、小麦、玉米、大麦等主要农作物上获得成功,且在大麦、玉米上成功地从未经预处理及预培养的游离小孢子培养获得了再生植株。籼稻花药培养能力远远低于粳稻,对其游离小孢子的离体培养研究甚少。本文简要报道这方面的研究结果。     

构树聚花果及其果实原汁营养成分的研究

对构树聚花果的营养成分进行分析,结果表明,其果实含有丰富的营养物质,氨基酸,糖类,矿质元素等成分,其果实原汁含有丰富的可溶性糖类,蛋白质,氨基酸,维生素等营养成分,此外,种子含有丰富的脂肪油（40．28％）,其脂肪油中人体必需的脂肪酸亚油酸的含量达（85．42）,其聚花果,果实原汁,种子油具有开发利用的价值。     

INFERRING TAXONOMIC POSITIONS AND TESTING GENUS LEVEL ASSIGNMENTS IN COCCOID GREEN LICHEN ALGAE: A PHYLOGENETIC ANALYSIS OF 18S RIBOSOMAL RNA SEQUENCES FROM DICTYOCHLOROPSIS RETICULATA AND FROM MEMBERS OF THE GENUS MYRMECIA (CHLOROPHYTA, TREBOUXIOPHYCEAE CL. NOV.)1

Complete nuclear-encoded small-subunit ribosomal RNA (18S rRNA) coding sequences were determined for the coccoid green algae Dictyochloropsis reticulata (Tschermak-Woess) Tschermak-Woess , Myrmecia astigmatica Vinatzer, and M. bisecta Reisigl, to investigate the taxonomic position of Dictyochloropsis Geitler and of the genus Myrmecia Printz. Phylogenies inferred from these data revealed a sister-group relationship between D. reticulata and certain coccoid green algae that lack motile stages (autosporic coccoids) within the order Microthamniales. The monophyletic origin of the Microthamniales, including autosporic coccoids previously classified in the Chlorophyceae, is clearly resolved by the rRNA sequence data. This finding. shows the considerable taxonomic breadth of that order, whose taxonomic position has been unclear so far. A new class, Trebouxiophyceae, is proposed for this group of green algae. Phylogenetic inferences from the rRNA sequences show paraphyly of the genus Myrmecia. The 18S rRNA sequence data suggest that, among taxa that share similar vegetative cell morphologies, the zoospore characters resolve better the actual genus and species boundaries. Within identical zoospore types, the rRNA data allow further resolution of taxonomic relationships. On the basis of the.se findings, I propose that the genus Friedmannia Chantanachat ± Bold be merged into Myrmecia and that only those species be left in the genus Myrmecia that are identical in particular zoospore characters (i.e. those described in detail for M. israeliensis ( Chantanachat ± Bold) comb, nov.), namely M. astigmatica, M. biatorellae (Tschermak-Woess ± Ptesst) Petersen, and M. israeliensis. Myrmecia bisecta has to be excluded from Myrmecia; its taxonomic position within the Trebouxiophyceae is unclear .