Effect of light on glycolysis during leaf development in arachis hypogaea l

Zhang L.; Li M Q.

Acta Phytophysiologica Sinica 17(4): 373-379

1991


Accession: 007252152

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Abstract
Effect of light on the glycolysis of green tissues of peanut (Arachis hypogaea) leaves with different ages was studied. Apparent photosynthetic rate gradually increased with the increase of leaf age and reached its maximum on the 7th day and remained relatively constant for four days when the leaves became mature, then decreased gradually to the 21st day when the leaves became old. It was shown that young leaves had the highest respiration rate, which decreased gradually with lead development. Triose phosphate content increased in both chloroplastic and non-chloroplastic fractions of illuminated mature (7 .apprx. 10 days) leaves as compared with that in dark-treated leaves, while those in young (0 .apprx. 1 day) and old (21 days) leaves remained unchanged under illumination. Chloroplastic glyceraldehyde-3-phosphate dehydrogenase activity was enhanced by illumination in all (young, mature and old) leaves, with the greatest enhancement in mature leaves, while that in non-chloroplastic fraction was not affected or even slightly decreased in mature leaves. Under illumination, pyruvate kinase activity in young leaves increased, while that in mature leaves decreased; light had no effect on the activity of pyruvate kinase in old leaves. It was found that pyruvate content in chloroplastic fraction, increased in young leaves and decreased in mature leaves, but no change was found in old leaves. Pyruvate content in non-chloroplastic fractions decreased only in mature leaves, no change was found in either young or old leaves. It was found that pyruvate content in chloroplastic fraction, increased in young leaves and decreased in mature leaves, but no change was found in old leaves. Pyruvate content in non-chloroplastic fractions decreased only in mature leaves, no change was found in either young or old leaves under illumination. When peanut leaves were treated with DCMU (100 .mu.mol/L), an inhibitor of photosynthetic electron transport, no effect of light on triose phosphate and pyruvate contents as well as on the activities of glyceraldehyde-3-phosphate dehydrogenase and pyruvate kinase was found; the results were similar to those of dark treatment. It was concluded that light had significant effect on glycolysis of green tissues of mature leaves, but no effect was found in young and old leaves. This effect may be mediated by photosynthesis.