O N Mehrotra
Articles written in Proceedings – Section B
Volume 32 Issue 5 November 1950 pp 179-204
Volume 32 Issue 6 December 1950 pp 252-268
This paper elucidates the interrelation between leaf area and other leaf characteristics in six varieties of sugarcane grown under field conditions. Relation between these features and drought resistance in sugarcane is also analysed.
Drought-resistant behaviour of Rheora is associated with poor leaf surface and small size of leaves. Co 205 approaches this variety most in the characteristics of its leafy growth.
Leaf surface expansion is found to be determined by three conditions, namely, increase in (i) leaf length, (ii) leaf width and (iii) dry weight of leaves. High positive correlation between these factors and leaf area indicates that these characteristics are highly correlated. The possibilities of water content showing negative correlation with leaf area is also pointed out.
Relation between leaf area and linear measurements of length and breadth is expressed by the following two equations: For a single leaf:— Log A = Log L + Log B + Log K (1) For a population of leaves:— Log Σ A = Log Σ L + Log ΣB + Log K - Log N, (2) where A is leaf area, L = leaf length, B is leaf breadth, K is leaf factor and N is number of leaves.
The leaf factor K appears to be an important physiological constant representing the relation between linear growth (L x B) and leaf area. Its relatively low value in drought-resistant Rheora and also in Co 205, as against its relatively high value in other varieties with high leaf indices— Co 290, Co 453, Co 385 and Co 312—is characteristic.