Genkel' P A, Pronina N D
Biol Bull Acad Sci USSR. 1979 Jul-Aug;6(4):504-9.
the effect of desiccation on the green alga Zygnema, a typical aquatic form of the order Conjugatae, family Zygnemaceae, is investigated. The vegetative reproduction of Zygnema occurs with the separation of the filaments in two different ways. It is shown that changes take place in cell morphology during desiccation. After division most of the cells acquire the shape of a square. These are usually half as large as the vegetative cells prior to division. Also, the form and color of the chromatophores change; they become green-brown, i.e., Zygnema falls into a state of rest, since no cell division is observed. During this state of rest the filaments suffer the unfavorable conditions of summer drought. In the fall, at the end of August, with the shortening of the day and reduction of temperature, the alga develops parthenospores for overwintering.
研究了干燥对双星藻（Zygnema）的影响，双星藻是双星藻科（Zygnemaceae）共轭藻目（Conjugatae）典型的水生藻类。双星藻的营养繁殖通过两种不同方式使丝状体分离来进行。结果表明，在干燥过程中细胞形态会发生变化。分裂后，大多数细胞呈正方形。这些细胞通常只有分裂前营养细胞大小的一半。此外，色素体的形态和颜色也会改变；它们变成绿褐色，即双星藻进入静止状态，因为未观察到细胞分裂。在这种静止状态下，丝状体经受夏季干旱的不利条件。在秋季，八月底，随着白昼缩短和温度降低，藻类会形成单性孢子以越冬。
