因此，当瓜类植物的根在雨水浸湿的土壤中时，它们的光合作用率低于通常水平。

It follows that melon plants have a lower-than-usual rate of photosynthesis when their roots are in rain-soaked soil.

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植物的祖先是进行光合作用的单细胞生物，由此产生的植物可能缺乏真正的根、茎、叶和复杂的生殖结构，如花朵。

The ancestors of plants were photosynthetic single-celled organisms that gave rise to plants presumably lacked true roots, stems, leaves, and complex reproductive structures such as flowers.

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研究了根域体积限制对日光温室基质栽培黄瓜生长及光合特性的影响。

The effect of root restriction on the growth and photosynthetic characteristics of cucumber in solar greenhouse was studied .

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