P Gopala Rao
Articles written in Proceedings – Plant Sciences
Volume 88 Issue 5 September 1979 pp 397-400
In all the three plants selected, viz.,
Volume 89 Issue 6 December 1980 pp 457-464
The effect of kinetin and morphactin on flower sex expression has been studied in castor. It was observed that the ratio of female to male flowers was 1:4·75 in control; 1:1·61 in kinetin and 1:3·29 in morphactin treated plants. Although the number of female flowers increased in morphactin-treated plants, the sex ratio did not alter much as there was slight decrease in male flowers. Kinetin elicited an increase in femaleness and decrease in maleness, consequently causing reduction in total number of flowers, compared to control plants. Carbohydrate contents were increased with kinetin and morphactin treatments. Reducing and non-reducing sugars were more in the female flowers than male flowers. Male flowers surpassed female flowers with respect to starch content. Treatments increased total protein and soluble nitrogen in the shoot tips, compared to those of control plants. Total and soluble nitrogen were low whereas protein nitrogen was higher in the pistillate flowers than in the staminate flowers. The modification of sex expression is discussed with respect to carbohydrate and nitrogen metabolism.
Volume 91 Issue 3 June 1982 pp 183-188
Kinetin (50 and 100 mg 1−1) inhibited both the shoot and the root growth. Inhibition of root growth by kinetin is considered to be mainly due to inhibition of protein synthesis. Vitamins of the B group
Volume 91 Issue 6 December 1982 pp 495-500
The photosynthetically efficient
Volume 93 Issue 2 June 1984 pp 111-117
Temperature and vitamin-induced changes in root elongation are closely associated with changes in non-reducing sugar content in particular. Thiamine enhanced the reducing sugar content of the shoot and reduced that of the root at normal temperature. In contrast, elevated temperature caused a significant reduction in the reducing sugar content of the shoot and increased that of the root. Thiamine at elevated temperature showed a synergistic effect in decreasing the sugar content of the shoot and increasing it in the root. Although riboflavin could not enhance the reducing sugar content of the shoot at normal temperature, at elevated temperature its response was quite similar to that of thiamine. These differences were partly associated with amylase activity of the root and the shoot. Vitamin treatment preceded by elevated temperature showed synergistic effect with respect to non-reducing sugar content by increasing it in the shoot and the root. The role of vitamins is discussed.