Results shows high root temperature is more detrimental than high air temperature. But what is the mechanisms behind it?
Please have a look in this PDF files for detailed information
www.mdpi.com/2223-7747/6/1/6/pdf
https://lib.dr.iastate.edu/cgi/viewcontent.cgi?article=11951&context=rtd
www.tandfonline.com/doi/abs/10.1080/01904169009364127
https://link.springer.com/article/10.1007/BF02374326
Dear Prasanta, increase in root temperature has greater effect on exudation volume flow than on the ion concentration in the exudate. In general, root behave as an osmometer i.e. temperature determines the rate of ion transport in the symplasm (plasmodesmata) and the release into the xylem, and water moves accordingly along the water potential gradient. For example, an increase in the root temperature results in an increase in the potassium concentration but a decrease in the calcium concentration of the exudate. This shift in the potassium / calcium ratio might reflect temperature effects either on membrane selectivity or on the relative importance of the apoplasmic pathway of radical transport of calcium and water (Engels et al. 1992). This temperature effect may have important implications for calcium nutrition of plants and might explain the enhancement of calcium deficiency symptoms at elevated root temperature.
Check this links the articles maybe help you
http://hortsci.ashspublications.org/content/27/7/796.full.pdf
http://horttech.ashspublications.org/content/18/2/290.full
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