In monocot seedling, the highest concentration of auxin is found in the coleoptile tip which decreases progressively toward its base. This phenomenon is known as apical dominance, and it occurs when the concentration of auxins … It is produced in high concentration at the shoot apex. The highest mean RGR stem length was in stem cuttings treated with … Quizlet flashcards, activities and games help you improve your grades. Auxin concentration changes from high (dark blue) to low (pale blue) in the region of the incipient primordia (Fig. Hence, low concentration of auxin inhibits growth in shoot.Thus, the correct answer is option B. But, it is important to note that, auxin is more or less uniformly distributed in each horizontal layer of … 5). 4A, P i, R i, D i, in brackets) as the capitulum forms phyllaries, ray florets, and disc florets consecutively. However, when the RGR data was analyzed using one way ANOVA or t-test within each auxin concentration, there were no significant differences among the three types of auxins (p>0.05, Fig. 17.10. Roots, in general, show growth stimulation at very low concentration (0.0001 ppm), while in stem the similar response occurs at a relatively high concentration (10 ppm) (Fig. In this way auxin moves down the stem with the help of auxin efflux pumps that sets up concentration gradients of auxin in the plant tissue -highest at the meristem and lowest towards the plant base. Apical dominance is a phenomenon in which central stem is dominant and lateral stems are suppressed. c. the stem base is an auxin sink as seen by the accumulation in the control stem base «where roots form» OWTTE 2006; Smith et al. 2006a). a. L1 has the highest concentration of auxin so appears to be/is the main source/the producer of auxin b. as leaves age, they «appear to» decrease the production of auxin Vice versa. Auxins located in the main stem have the ability to slow growth in the surrounding shorter shoots. It promotes stem elongation and inhibits growth of lateral buds. When produced synthetically, they can be used in high concentrations as a pesticide, causing drastic growth. The distribution of auxin in monocot and dicot seedlings is shown in Fig. Auxins can be produced naturally (by the plant) or synthetically (in a lab). Auxins study guide by jess-hawkins includes 20 questions covering vocabulary, terms and more. Usually, a low concentration of auxin stimulates the growth while high concentration inhibits the growth of the same cell or organ. In computer models simulating phyllotactic patterning, PIN1 is predicted to polarize toward the neighboring cell with the highest auxin concentration (Jonsson et al. From the base of the coleoptile, the auxin concentra­tion increases progressively up to the root tip. 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