کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1975583 1539168 2011 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Ontogenetic changes in citrate synthase and lactate dehydrogenase activity in the jumping muscle of the American locust (Schistocerca americana)
موضوعات مرتبط
علوم زیستی و بیوفناوری بیوشیمی، ژنتیک و زیست شناسی مولکولی زیست شیمی
پیش نمایش صفحه اول مقاله
Ontogenetic changes in citrate synthase and lactate dehydrogenase activity in the jumping muscle of the American locust (Schistocerca americana)
چکیده انگلیسی

Intraspecific studies have repeatedly shown that muscle-specific oxidative enzyme activities scale negatively with body mass while muscle-specific glycolytic enzyme activities scale positively. However, most of these studies have not included juveniles. In this study, we examined how citrate synthase (CS, EC 2.3.3.1) and lactate dehydrogenase (LDH; EC 1.1.1.27) activity in the jumping muscle of Schistocerca americana grasshoppers varied with ontogeny across a 40-fold increase in body size. In contrast to the pattern observed when adult conspecifics are compared, we show that jumping muscle CS activity increased more than 2-fold from 2nd instars to adults, while jumping muscle LDH activity increased more than 5-fold. The increased LDH activity in older grasshoppers supports previous data that older grasshoppers have a reduced jumping endurance. The increased CS activity with age may help older grasshoppers efficiently produce aerobic ATP to bend cuticular springs for energy storage before a jump or alternatively recover from anaerobic metabolism after jumping. Metabolic changes in S. americana jumping muscle are similar to other developing taxa and highlight the importance of including juveniles within intraspecific studies. When compared to adults, juvenile locomotion may have increased selection pressure because of both greater energetic demands during growth and higher predation rates.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Comparative Biochemistry and Physiology Part B: Biochemistry and Molecular Biology - Volume 160, Issues 2–3, October 2011, Pages 110–116
نویسندگان
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