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Pakistan Journal of Biological Sciences
Year: 1999  |  Volume: 2  |  Issue: 4  |  Page No.: 1118 - 1124

Morphological Deformations of Root Hasirs in Trifoliate Orange Grafted with Satsuma Mandarin under High Summer Temperature and Limited Soil Moisture Conditions

Pear Mohammad and Masaya Shiraishi    

Abstract: The morphological deformations of root hairs in trifoliate orange grafted with satsuma mandarin (Citrus unshiu Marc. cv. Okitsu Wase) under high summer temperature (40-45°C) and limited soil moisture (pF 2.7-2.9) conditions were observed under scanning electron microscope. The hair zone positioned apart from the root tip before treatments which gradually proceeded nearer the root tip under only high temperature stress. However, the speed of this effect was so slow that even after 25 days of exposure the hair zone was not found to be completely proximal to the root tip. The elongation of hairs was noticed within 5 days which gradually deformed and after 25 days of exposure almost all the hairs were degraded. In contrast, at high temperature accompanied low soil moisture condition, hair zone appeared extremely nearer the root tip within 5 days followed by the random occurrence of hairs from root tip up to a certain distance towards the base. Although slightly elongation of hairs was found at the initial stage, severe degradation ensued at the following sampling dates. As the consequences, after 25 days of treatment the complete destruction of hairs occurred where only the traces of abolished hairs were left. In general, only the high temperature stress primarily resulted the formation of dense hairs but this dense hair formation was instantly inhibited as the interactive effects of high temperature and low soil moisture stress.

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