The effect of Drought on Allometric Relationships of the Leaf area and Vegetative Characteristics in Two Sensitive and Tolerant White Beans toVigna Sinensis Tension

Growth and function of the root and aerial organ are closely related to each other. Due to the problems that exist regarding studying the root, there is less information about the characteristics of root than aerial organs. Through the allometric relationships between various components of the root, the effects the root and the aerial organ have on one another can be quantified and specified. This experiment was done in order to recognize the allometric relationships between the leaf area in different white bean cultivars. That is why an experiment was done using two different white bean cultivars, one was the tolerant KS41126 and the other was the blossoming white bean sensitive to deficit irrigation tension, in two different conditions including desirable irrigation and deficit irrigation tension in a farm as a factorial in the frame of randomized complete blocks with three repetitions in the replication year of 2012-2013 in the farm of Payam-e Noor University of Damghan. Sampling was done in three stages growth (stage of seedling, flowering and maturity) as an estimation and the characteristics of the leaf area, dryweight of vegetative parts (root, stem and leaf) and height of the plant, number of leaves and length of the longest root were measured. In order to describe the relationship of leaf area with the mentioned characteristics, power equation and linear equation were used.For various stages, the equation was fitted. The results showed that there wasn’t a significant difference between cultivars and kind of irrigation in terms of the coefficients of the equation. Therefore, an equation was able to justify the relationships between leaf area and other characteristics in the two cultivars in both kinds of irrigation. The determination coefficients for the relationship of leaf area in the plant with the number of leaves in the stem (R2=0.91), dry weight of green leaf (R2=0.93), height of the plant(R2=0.92) and dry weight of the root (R2=0.89) were significant which showed that there is a high correlation between them and the leaf area. Thus, the equations obtained fromthe regression can be used in the white bean simulation models in order to easily quickly estimate the leaf area when the devices for measuring leaf area are not available.

کلیدواژه ها:

Allometric ، Leaf area ، Vegetative Characteristivs ، White Bean