A S Sastry
Articles written in Proceedings – Section B
Volume 38 Issue 3 September 1953 pp 125-143
Volume 43 Issue 2 February 1956 pp 110-120
In order to study the biochemical peculiarities of flue-curing and air-curing a flue-cured type of leaf was subjected to both the systems of curing.
During the first 40 hours which corresponded to the yellowing stage in flue-curing, the leaf was at a higher temperature and humidity in flue-curing than in shade-curing.
This resulted in hastening of chemical reactions in flue-curing as compared to shade-curing. The leaf was completely yellow at the end of 40 hours in flue-curing, while it was only 75% yellow at the end of 123 hours in shade-curing. Also there was greater hydrolysis of starch, more production of sugars and finally greater loss of solids in flue-curing than in shade-curing.
The contribution of carbohydrates to respiratory losses in the early stages was more in flue-curing than in shade-curing, showing thereby that more of other constituents than carbohydrates contributed to these losses in shade-curing.
Probably because of this there was considerable loss of nitrogen under shade-curing while the changes in this constituent during flue-curing were insignificant.
The present study thus tends to show two facts.
1. Due to higher temperature in flue-curing the chemical reactions are hastened as compared with shade-curing.
2. Even in flue-cured leaf, some reactions characteristic of air-curing occur, if it is subjected to air-curing.
Volume 44 Issue 3 September 1956 pp 148-161
Volume 44 Issue 3 September 1956 pp 162-170
1. The yellowing of the leaf cultured on sugar solutions was found to be better than that in controls.
2. This was found to be due to the higher carbohydrate content of the sugar-fed leaves, as compared to controls.
3. After briefly reviewing the literature on yellowing, a hypothesis on the role of carbohydrates has been suggested.
4. The water content of the leaves was found to play a part too and this was explained as due to the mobility of carbohydrates.
5. The better grading analysis of sugar-fed leaves as compared to controls in a semi-large scale experiment was in line with the yellowing behaviour of the sugar-fed leaves.
Volume 51 Issue 5 May 1960 pp 219-226
The rate of hydrolysis of protein during flue-curing was examined in the light of a relationship between protein and soluble nitrogen in the leaves at the time of harvest.
It was shown that a high ratio of protein N to (soluble N—nicotine N) is associated with a rapid rate of proteolysis and a low ratio with a slow rate.