Lignification in young plant seedlings grown on earth and aboard the Space Shuttle
Lignification in young plant seedlings grown on earth and aboard the Space Shuttle
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在地球和航天飞机上生长的幼苗的木质化
DOI：
10.1021/bk-1989-0399.ch015
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
C. Peterson
中科院分区：
文献类型：
--
作者：
J. Cowles;R. Lemay;G. Jahns;W. Scheld;C. Peterson
航天飞机时代为研究人员提供了在微重力环境中进行实验的机会。两次航天飞机飞行，STS-3和STS-51F，每一次都包含一个实验，主要是为了确定暴露在微重力下的幼苗是否比在一个重力下生长的幼苗减少了木质素含量。三种不同的植物，松树、燕麦和绿豆，被暴露在航天飞机的微重力环境中8天。在这两个试验的7组苗木中，飞播苗的木质素含量均低于对照苗。在五组苗木中，飞行苗木木质素含量的下降幅度在6%到24%之间，且具有统计学意义。此外，参与木质素合成的苯丙氨酸解氨酶和过氧化物酶活性在松树幼苗中显著降低。因此，正如幼苗所感受到的那样，微重力会导致木质素合成减少。
The Space Shuttle era has provided an opportunity for investigators to conduct experiments in a microgravity environment. Two Shuttle flights, STS-3 and STS-51F, each contained an experiment designed principally to determine whether young plant seedlings exposed to microgravity had reduced lignin content in comparison to seedlings grown at one gravity. Three different plant species, pine, oats, and mung beans, were exposed for eight days to the microgravity environment of the Shuttle. The lignin content of in-flight seedlings was less than the control seedlings in all seven sets of seedlings included in these two experiments. In five sets of seedlings, the reduction in lignin content in flight seedlings ranged from 6 to 24 percent and was statistically significant. In addition, the activity of two enzymes involved in lignin synthesis, phenylalanine ammonia lyase and peroxidase, were significantly reduced in pine seedlings. It was therefore concluded that microgravity, as perceived by young plant seedlings, results in reduced lignin synthesis.