摘要
于1989－1992年在福建、江苏和青岛沿海采集红毛菜，进行野外观察，并在室内光照强度为70－100μE／（m2·s）的培养架上培养，每两周更换培养液，完成从原叶体到丝状体整个生活周期培养；对福建和江苏红毛菜有性生殖时两性细胞的构造和作用进行观察，并在生活周期的关键阶段用Wittmann方法压片，计数其染色体。结果表明，生长在福建的红毛菜染色体数目为n=6，2n＝12；江苏和青岛的为n=8，说明中国的红毛菜至少有两种；细胞学观察证明，两性细胞已完成受精作用，果孢子是受精后的产物；同时，幼年红毛菜还能放散大量无性孢子，双极萌发成为与亲代相同的植物体，这可使红毛菜在短时期内数量剧增。
Field and culture [15-30℃, 70~ 100μE / (m2. s)] studies on Bangia collected fromcoasts of Fujian Province, Jiangsu Province and Qingdao were conducted in 1989-1992. An integrallife cycle from macroscopic phase to microscopic phase had been completed in culture. The slideswere prePared according to Wittinann (1965) in some key phases of the life cycle. The structure andfunction of the sexual cells, spermatia and carpogonia, in the sexual reproduction of Bangia sp. wereobservated with olympus BW-2 microscope. The results were as follow. The carpogonia possessedextensive protrichogynes (Plate 1:2-6) and a few spermatia adhered on these Proections (Plate 1:6)which disappeared after fertilization (Plate I:7, 8). The cytological evidence indicates that thefertilization was completed. Haploid chromosome number in the vegetative cells of macroscopicthallus and spermatia, and diploid chromosome number in cmpspores had been shown by cytologicalstudies of the different phases of life cycle. The carpospores were the products after fertilization.Simultaneously, some younger thalli of Bangia sp. could release a large number of asexual sporeswhich developed in bipolar fashion to produce thalli which is the same as their parents. Therefore,the asexual reproduction mode could result in a significant increase in the plants within a limitedperiod of time.The chromosomes of some key phases of the life cycle, vegetable cells, spermatia, carpogonia,neutral spores, were counted. The work proved that the chromosome number of Bangia sp. fromFujian was n = 6, 2n =12 (Plate I:9,10), and that from Jiangsu and Qingdao n = 8 (Plate I:11, 12).Morphylogical chateristics of Bangia sp. are very simple, whilst more difficulites have beenencountered in the classification of this genus. The studies on the chromosome number in this papershow that Bangia sp. from the different sites of China at least includes two species with differentchromosome numbers.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1998年第3期269-273,共5页
Oceanologia Et Limnologia Sinica
基金
中国科学院基金!900655
关键词
繁殖方式
染色体数目
分类
红毛莱
Reproductive modes Chromosome number Classification Bangia sp.
