5‐Hydroxytryptamine affects turnover of polyphosphoinositides in maize and stimulates nitrate reductase in the absence of light

FEBS Letters

Chandok, Meena R.¹  Sopory, Sudhir K.¹ 

[1]Molecular Plant Physiology Laboratory, School of Life Sciences, Jawaharlal Nehru University, New Delhi-110067, India

关键词: Nitrate reductase;    Phytochrome;    Polyphosphoinositide cycle;    Zea mays;   

DOI  :  10.1016/0014-5793(94)01213-X

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Incubation of etiolated maize leaves for 5 min in 5-hydroxytryptamine increased phosphatidylinositol-4,5-bisphosphate levels but on longer incubation its level decreased and a corresponding increase in inositol-trisphosphate was observed. The increase in phosphatidylinositol-4,5-bisphosphate by 5-hydroxytryptamine was similar to that obtained after short irradiation of leaves with red light. Nitrate-inducible and phytochrome-stimulated enzyme nitrate reductase could be stimulated in darkness if the leaves were incubated in the presence of nitrate and 5-hydroxytryptamine. These results indicate that one of the initial events in phytochrome-mediated enzyme stimulation could be through the generation of ‘signals’ from the turnover of the phosphoinositide cycle.

【 授权许可】

Unknown