镁镁对叶绿素（光合作用的色素）合成是必要的，常常很丰富，一般不是限制因素。
Magnesium. Magnesium is essential for the synthesis of chlorophyll, the green pigment of photosynthesis. It is usually fairly abundant and does not ordinarily represent a limiting factor.
光合碳代谢和光化学反应受低温限制是冬季光合作用较低的重要原因。
Low temperature in winter limited photosynthetic carbohydrate metabolism and photochemical reaction caused low photosynthesis.
结果表明，施用锰肥能降低光合作用的气孔限制和非气孔限制，显著提高夏玉米光合能力。
The results showed that application of manganese fertilizer lessened the stomatal and non-stomatal limitation on maize photosynthesis performance.
强光下光合作用“午睡”的原因是气孔限制。
The midday depression of photosynthesis was due to the stomatal limitation.
结果表明，铝胁迫影响龙眼幼苗光合作用，导致光合效率降低，非气孔因子成为限制光合作用的主要因子。
Aluminum stress was found to affect the photosynthesis of longan seedlings and reduce the photosynthetic efficiency. The non-stomas factors were observed to mainly hinder the photosynthesis.
叶片是小麦进行光合作用的重要器官，其衰老引起的叶片同化功能减退限制了小麦产量潜力的发挥。
The wheat leaf is the main organ for photosynthesis. The decline of assimilation induced by leaf senescence may limit yield potential.
轻度水分胁迫引起的光合作用下降是气孔限制的结果，而严重水分胁迫导致光合作用的非气孔限制。
The decline of photosynthetic CO_2 assimilation under high water stress was due to non-stomatal limitation, while that under low water stress was due to stomatal limitation.
轻度水分胁迫引起的光合作用下降是气孔限制的结果，而严重水分胁迫导致光合作用的非气孔限制。
The decline of photosynthetic CO_2 assimilation under high water stress was due to non-stomatal limitation, while that under low water stress was due to stomatal limitation.
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