WATER DEFICIT AND THE GROWTH AND ANATOMY OF THE RADISH FLESHY AXIS

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SUMMARY

Radish (cv. Mars) plants were subjected to different water deficits during the expansion of the fleshy axis, and cell division and expansion in the various tissues of the axis were measured both during stress and in recovery. Water deficit inhibited both cell division and cell expansion in all axis tissues, but there was no evidence that the relationship between the various tissues was disturbed. The walls of parenchyma cells significantly thickened during a period of water deficit and staining with toluidine blue suggests that this was due to lignification. When water stress was relieved, cell expansion in the pericycle cells out-stripped the recovery of cell division.

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