What question did this study set out to answer?

To determine whether leaf nitrate content or nitrate flux from the roots regulates nitrate reductase activity in maize leaves.

October 1, 1976PLANT PHYSIOLOGYOpen Access

Nitrate Reductase Activity in Maize (Zea mays L.) Leaves

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Authors

DSDale L. ShanerAgricultural Research Service JBJohn S. BoyerAstraZeneca (United Kingdom)

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Implication

Experimental study reveals that xylem nitrate flux regulates leaf nitrate reductase activity in maize seedlings, indicating flux controls enzyme levels more than static tissue nitrate.

Key Points

To determine whether leaf nitrate content or nitrate flux from the roots regulates nitrate reductase activity in maize leaves.
Assessed 8- to 14-day-old maize (Zea mays L.) seedlings maintained under constant environmental conditions.
Measured nitrate flux as the product of transpiration rate and xylem nitrate concentration during nutrient deprivation, root cooling and rewarming, and in excised shoots.
Decreasing nitrate flux via root cooling or shoot excision caused a rapid loss of nitrate reductase activity despite leaf nitrate content initially remaining unchanged.
Rewarming roots or resupplying nitrate restored nitrate flux, tissue nitrate levels, and nitrate reductase activity to baseline control levels.
Nitrate delivery flux from roots to leaves exerted a significantly greater regulatory effect on nitrate reductase activity than total internal leaf nitrate storage.

Cite This Study

Shaner et al. (1976) studied this question.

synapsesocial.com/papers/6a7c37f9073f483584dfbe55 https://doi.org/10.1104/pp.58.4.499

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Implication

Experimental study reveals that xylem nitrate flux regulates leaf nitrate reductase activity in maize seedlings, indicating flux controls enzyme levels more than static tissue nitrate.

Nitrate Reductase Activity in Maize (Zea mays L.) Leaves

Discussion

Member takes

Implication

Key Points

Cite This Study

Nitrate Reductase Activity in Maize (Zea mays L.) Leaves

Discussion

Member takes

Implication

Key Points

Cite This Study

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