| Abstract: | The relationship between the rate of linear growth and distanceof initiation of the zone of lignification behind the root-tipin young roots of Lepidium sativum L. was investigated underdifferent cultural conditions. The distance varied between 1.0 mm and 3.4 mm. All the factorswhich retard linear growth reduce the distance of the zone oflignification behind the root-tip, and an acceleration in lineargrowth increases the distance correspondingly. The reductionor extension of this distance depends upon the intensity oflinear growth, and is independent of the nature of the inhibitingagent employed. The factors and substances used were temperature,mannitol, respiratory inhibitors like KCN, 2-4 DNP, sodium fluorideand p-nitrophenol IAA, coumarin, and nitrate and phosphate. |
