Plant Physiology In order to enhance the efficiency with which turnips store ami
ID: 210746 • Letter: P
Question
Plant Physiology
In order to enhance the efficiency with which turnips store amino acids in their roots, you genetically engineer a plant that contains nitrite reductase in its roots instead of in its leaves as most plants do. Your reasoning is that if nitrite is reduced in the roots instead of the leaves, it will save the plant the cost of transporting the nitrite from roots to leaves, and then transporting the reduced form back to the roots. Instead you find that even though you succeed in getting nitrite reductase enzyme in the roots, little reduction actually occurs and nitrite accumulates in the roots to toxic levels. Meanwhile, the leaves begin to accumulate large amounts of starch and take on a yellowish color. Explain why these results have occurred.
Explanation / Answer
Nitrate fertilization leads to higher levels of amino acids and protein and increased growth and also to changes in carbon metabolism including
These far-reaching changes underline the important role played by the signaling mechanisms that regulate metabolism and development in response to the availability of nitrogen.
High level of the starch in leaves, that decrease the photosynthesis. Chloroplast is major site of starch synthesis and stored. So that high content of starch leads to chlorosis