Growth of lateral root primordia in vicia faba l
1976
MacLEOD, R. D.
Over the 136 h period between the initiation of a lateral root primordium and its subsequent emergence as a secondary root, cell number, length and volume of the primordium tended to increase in a linear manner, each increase being closely correlated with the others. The corresponding rates of increase, however, when calculated for different stages of primordium development, fluctuated greatly. Thus, the rate of cell proliferation was high 10 h following anlage initiation, but was subsequently very low. The rates of increase in meristem volume and length were also high at an early stage of primordium development (28–45 h), but decreased to reach minimal values between 62 and 78 h before increasing again. These changes in rate are discussed with respect to the development of a cavity in the adjacent cortical tissues of the primary root. Such cavities, which are initiated as a result of mechanical pressure, begin to form when the primordium has attained a cell number of about 1490 and reach a maximum size when the primordium contains about 10,800 cells.
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