Question

what is the biological basis behind photosynthetic rate being influenced by the mass of the sprig?...

what is the biological basis behind photosynthetic rate being influenced by the mass of the sprig? in other words one of the key problems you have is that if you have a bigger or a smaller sprig that weighs a different amount its capacity for photosynthesis will be based upon the sprig, why is that?

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Answer #1

Compared with optimum temperature, a lower photosynthetic rate was observed at high temperature which is an interplay between thylakoid membrane damage, thylakoid membrane lipid composition, oxidative damage of cell organelle, and stomatal and non-stomatal limitations. Triacylglycerol levels were higher under high temperature stress. Polar lipid fatty acyl unsaturation was lower at high temperature, while triacylglycerol unsaturation was the same at high temperature and optimum temperature. The changes in lipid species indicates increases in activities of desaturating, oxidizing, glycosylating and acylating enzymes under high temperature stress. Cumulative effect of high temperature stress led to generation of reactive oxygen species, cell organelle and membrane damage, and reduced antioxidant enzyme activity, and imbalance between reactive oxygen species and antioxidant defense system.

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