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粘虫蛾飞行肌超微结构的研究
引用本文:罗礼智,李光博.粘虫蛾飞行肌超微结构的研究[J].昆虫学报,1996,39(2):141-148.
作者姓名:罗礼智  李光博
作者单位:中国农业科学院植物保护研究所
摘    要:应用电子显微镜对粘虫雌蛾Mythimna separata(Walker)飞行(背纵)肌的研究结果表明,其肌原纤维由500-700根肌球蛋白丝(粗丝)组成,每根粗丝由6根肌动蛋白丝(细丝)环绕排列成六角形,每根细丝精确地位于两根粗丝间1/2处,从而使粗丝和细丝的比为1:3。肌节较短,长度约2.2-2.6μm。肌原纤维之间充满着线粒体和横管。每个肌节约有线粒体三个,横管二根。线粒体约占肌纤维体积的40%,而横管为7%。每根横管准确地位于肌节的1/4、3/4处,或Z线和中膈的中央,并与肌质网交接形成二位体(dyads)或三位体(triads)。肌质网相当不发达,约占肌纤维体积的2.5%。但其分布很有特色,即除了紧贴于肌原纤维周围的由单层液泡组成的肌质网以外,在中膈处还有一层横穿于肌原纤维的肌质网。和其它同步飞行肌的结构和功能分析比较的结果还表明,粘虫蛾飞行肌具有较善于飞行的结构。

关 键 词:粘虫  飞行肌  肌原纤维  肌节  肌质网  横管  

ULTRASTRUCTURE OF THE FLIGHT MUSCLE OF ADULT ORIENTAL ARMYWORM,MYTHIMNA SERATA(WALKER)
Luo Lizhi, Li Guangbo.ULTRASTRUCTURE OF THE FLIGHT MUSCLE OF ADULT ORIENTAL ARMYWORM,MYTHIMNA SERATA(WALKER)[J].Acta Entomologica Sinica,1996,39(2):141-148.
Authors:Luo Lizhi  Li Guangbo
Institution:Institute of Plant Protection Chinese Academy of Agricultural Sciences Beijing 100094
Abstract:Ultrastructure of the indirect flight muscles of a migratory moth, Oriental armyworm Mythimna separata (Walker) was examined with electron microscope. In cross section, the polygonal, close-packed elliptical myofibrils each has a diameter of 0.8-1.0#m and consists of 500-700 myosin filaments. Thick and thin filaments form a hexagonal lattice with the thin filaments midway between the adjacent thickfilaments with ratio actin and myosin in 3:1. In longitudinal section, myofibrils exhibit regular, well aligned sarcomeres (sarcomere length about 2.2-2.6μm, A-band about 2.0 -2.3μm) divided by homogeneous and continuous Z lines. Mitochondria are intercalated between myofibrils and completely filled the interstices between them. There are usually 3 mitochondria and 2 T-tubes along each sarcomere. Mitochondriaand T-system are estimated to be about 40% and 7% respectively of the fiber'stotal volume. T-tubes situate at midway between Z lines and middle of each sarcomere and make contacts with sarcoplasmic reticulum (SR) to form dyads and triads wherein. The SR is lesser in quantity as compared with the T-system and occupies only about 2.5% of the fiber's total volume. The characteristic feature of the SR is that there is a layer of SR cisternae transversely penetrating myofibril halfway between Z lines in every sarcomere. Ultrastructure of the flight muscle fiber of M.Separata moth is similar to those of fast acting insect muscle fiber in many aspects even though it may show some variations as the moth's age changes.
Keywords:Mythimna separata  flight muscle  myofibril  sarcomere  sarcoplasmicreticulum  T- system    
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