|Author:||Cui, ShiMao ; Chen, GuiLin ; Nii, N.|
|Book Group Author:||NA|
The effects of water stress on the production of sorbitol in the leaves and roots of one-year-old grafted drought tolerant loquat cv. Mogi trees were investigated in Japan. Concurrently anatomical changes in the nuclei of the leaves and the root apical meristem were followed by staining with 4′-6-diamidino-2-phenylindole and observing the results by fluorescence microscopy. The degree of water stress was graded into three levels: (a) unstressed plots (control), (b) moderately stressed plots (m-plots, no irrigation period for 20 days), and (c) severely stressed plots (s-plots, no irrigation period for 25 days). The degree of water stress was estimated by the water saturated deficiency (WSD) of the leaves. With an increase in WSD, the sorbitol content in the leaves and roots increased, the accumulation occurring in the roots. Although WSD for the s-plots was higher than that for the m-plots, there was no significant difference in sorbitol content in leaves and roots between the two treatments. After recovery from water stress, the sorbitol content decreased gradually in roots and leaves. Leaves of m-plots abscised little after irrigation was resumed, whereas leaves of s-plots abscised severely; only a few trees died. New roots developed in control plants, but not in stressed plants. Water stress resulted in an acceleration of nuclear degradation and a decrease in starch accumulation in the mesophyll parenchyma and in the apical meristem from the root tip to 2-3 mm.
|Pages:||359 - 365|
|Journal:||Journal of the Japanese Society for Horticultural Science|
apical meristems, drought, drought resistance, irrigation,leaves, loquats, mesophyll, nuclei, parenchyma, plant anatomy, plantwater relations, root tips, roots, sorbitol, starch, water stress,Japan, Eriobotrya japonica, Eriobotrya, Rosaceae, Rosales, dicotyledons,angiosperms, Spermatophyta, plants, eukaryotes, East Asia, Asia,Developed Countries, OECD Countries, cell nuclei, drought tolerance,watering, Plant Physiology and Biochemistry (FF060), Plant WaterRelations (FF062), Environmental Tolerance of Plants (FF900), Soil WaterManagement (Irrigation and Drainage) (JJ800) (Revised June 2002)[formerly Soil Water Management], Horticultural Crops (FF003) (New March2000)