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Pakistan Journal of Biological Sciences
  Year: 1999 | Volume: 2 | Issue: 3 | Page No.: 919-927
DOI: 10.3923/pjbs.1999.919.927
 
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The Effects of Salinity on Formation, Growth and External Morphology of Roots in Trifoliate Orange Grafted with Satsuma Mandarin

Pear Mohammad , Masaya Shiraishi and Touru Manabe

Abstract:
The formation, elongation and periclinal growths, and morphology of roots in trifoliate orange grafted with satsuma mandarin (Citrus unshiu Marc. cv. Okitsu Wase) were studied under different levels of culture solution salinity. Root formation and root elongation were highest in no-salt-control treatment which decreased as the culture solution salinity was increased up to 50 mM. Both stelar and overall diameters gradually increased towards the root base under control. While these diameters became considerably higher near the root tip and increased slightly towards the root base under saline solutions. This increasing trend was drastically slowed by higher doses of salinity. The ratio of stelar to overall diameters fairly increased towards the root base under control but tended to be similar throughout the root tip in saline solutions. The continued growth of roots under control was accompanied by the distinct removal of older rootcap cells and the observation of intact epidermal cells. In contrast, epidermal cell dehydration initiated under 10 mM NaCl solution. The roots subjected to 25 and 50 mM of NaCl attributed root tip injuries along with severe epidermal cell dehydration and cell death even at short exposure. The formation of holes on the epidermis and distinct malformation of root tip increased considerably with respect to both increased salinity from 25 to 50 mM and the exposure time of roots to these saline solutions.
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How to cite this article:

Pear Mohammad , Masaya Shiraishi and Touru Manabe , 1999. The Effects of Salinity on Formation, Growth and External Morphology of Roots in Trifoliate Orange Grafted with Satsuma Mandarin . Pakistan Journal of Biological Sciences, 2: 919-927.

DOI: 10.3923/pjbs.1999.919.927

URL: https://scialert.net/abstract/?doi=pjbs.1999.919.927

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