heterocysts

Following an initial inhibition under high PAR, growth and maximum quantum yield were stimulated, and heterocyst formation was enhanced and high PAR interfered with the normal pattern of heterocyst differentiation with contiguous heterocysts formed in filaments.

在强PAR照射下，最初发生光抑制，随后生长和最大光化学效率都逐步恢复，而且异形胞分化能力增强，并干扰了正常的异形胞分裂模式，使藻丝体中形成相邻异形胞。

Anabaena PCC 7120 is a nitrogen-fixing filamentous cyanobacterium. When the combined-nitrogen source is limited in the environment, heterocysts are produced to fix nitrogen from the air.

鱼腥蓝细菌PCC7120是一种丝状的固氮蓝细菌，在环境中缺乏化合态氮源的时候能够分化异形胞来固定空气中的氮气。

The results show that solar UVR severely inhibited growth and maximum quantum yield of PSII ( Fv/ Fm), reduced trichome length and depressed the differentiation of heterocysts.

结果表明阳光UVR严重抑制生长、光系统Ⅱ最大光化学效率（Fv／Fm）、降低藻丝长度并抑制异形胞分化。