The microorgan-isms employed include mainly chemical conversion bacteria,phototropic bacteria and alga.
所利用的生物体主要包：转菌、向菌和藻类。
Auxins influence the growth of stems toward light (phototropism) and against the force of gravity (geotropism).
它可影响茎的向和背地生长。
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Let's start by talking about phototropism.
让我们先来性。
Auxin will always move away from the light in positive phototropism.
在正性中，生长素是会远离线移动。
And two big things that you should understand about plants are phototropism.
关于应该理解的两个重要概念之一是性。
Negative phototropism would be growing in the other direction.
负性就是朝相反方生长。
And so immediately when you plant a seed, the roots are going to show negative phototropism.
所以当种下一颗种子时，根部会立即表现出负性。
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划词翻译
详细解释
：
转
菌、向
菌和藻类。
性
是会远离
应该理解的两个重要概念之一是
