一种多雌蕊小麦花的发生和发育

INITIATION AND DEVELOPMENT OF FLOWERS IN A MULTI-PISTIL WHEAT

用光学显微镜和扫描电镜研究了三粒小麦花的发生和发育。从开始分化到浆片出现为止,三粒小麦花的分化和普通小麦相同,其后则由亚下皮层细胞的平周分裂在两个浆片的腋部各产生一个额外的副雌蕊。这样,每朵花中恒定地形成三个雌蕊。二个副雌蕊的发生起步较晚,发育进程往往落后,但均正常可育,雌配子体仍能在开花前达到成熟。

The initiation and development of flowers in a multi-pistil wheat-trigrain wheat has been investigated with LM and SEM. From the begining. of flower initiation until appearance of lodicules, no defference of flower differentiation and development could be detected between trigrain and common wheat. Thereafter, two supplemental additional pistils were formed separatly through periclinal division of sub-hypodermal cells in the axil of lodicules. Thus, Three pistils were constantly produced in a flower. Though the additional pistils occurred later, but the female gametophytes could develop quickly and achieve mature before blooming. All three pistils were fertile normally.