日光照时数对裙带菜配子体发育的影响

于１９９２年４月在青岛前海栈桥湾采集野生的裙带菜，并在室内分离和培养雌，雄配子体克隆，利用营养生长的配子体材料研究光照时数（ＤＨ）对配子体发育的影响，结果表明，连续光照可以有效地阻配子体发育，配子体只进行营养生长（ＶＧ），形成卵囊的配子体细胞占的比例为零，雌配子体细胞呈不规则圆形，多个细胞聚集成簇状，雄配子体则长成丝状体，随着ＤＨ的减少，发育的配子体细胞数比例逐渐上升，至ＤＨ为１２时达最高，为６３

INFLUENCE OF DAYLENGTH HOURS ON GAMETOGENESIS OF U. PINNAHFIDA (HAR.) SUR.

Wild sporophtes of U. pbotifch were sampled at Zhanqiao bay,Qingdao in April 1992. Male and female gametophyte clones were isolated and cul-tured in lab. VegCtative gametophytes were used to study the effects of differentdaylength hours (DH) on gaIntogenesis. The results indicated that continuous lightcan effectively ichbit gametogenesis. GametoPhytes grew vegetatively. The percentageof ooganium was zero. Optimum DH was 12, when the pereentage of ooganiumreached highest level-63%. DH higher or lower than 12 resulted in decreasedgametogenesis pereentage. Gamtogenesis percelltages were 35%, 42% and 3.8%, whenDH were 8, 15 and 22 respeetively. observaton results in sporophyte culturing experi-mots undr differeot DH shoWed that DH also influences the structure of sporophytemorphology. Som aspects related to different responses of gametophyte of U.pinnatifida to daylength hours are also discussed in this paper.