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Cold Exposure and Arsenic Effect on the Inorganic Phosphate Content in Root of Growing Paddy

M. S. Haque
Department of Biochemistry and Molecular Biology, Laboratory of Protein and Enzyme Research, University of Rajshahi, Rajshahi-6205, Bangladesh

M. K. Hossain
Department of Biochemistry and Molecular Biology, Laboratory of Protein and Enzyme Research, University of Rajshahi, Rajshahi-6205, Bangladesh

M. A. Haque
Department of Biotechnology , BSMRAU, Salna, Gazipur, Bangladesh

Abstract/ Executive Summary:

Development of root growth is impaired by environmental and chemical effects although the mechanism is not known. Pot experiments were carried out to examine the effects of cold acclimation and arsenic on inorganic phosphate (Pi) level in root of growing paddy (Oryza sativa). Whenever, paddy was exposed to cold. the amount of Pi in root was reduced by 50.1'%, l8.81% and 27.3% after 24h, 48h and 72h period respectively. Contrary, when the paddies were exposed to Na₂HAs0₄ (I and 10 mM) along with cold acclimation for the above mentioned time, the Pi level in root extract was enhanced remarkably. Moreover. the Pi content was increased with the increase in arsenic concentration and duration of plant exposure to arsenic.

Keywords: Cold acclimat ion, Plant growth, Pi, Arsenic, Adaptive response.

Location: Rajshahi University Campus

Start Date: 20-11-2008

End Date: 15-03-2009

Program Area: Risk Management in Agriculture

Commodity: Rice

Objectives:

To define the organization of the root meristem whether cold acclimation and arsenic may have the roles on the development of root growth by alteration of tissue Pi, since these stimuli cause the critical environment where the plants survive,

Methodology:

The soil was collected from the rice field of Rajshahi University Campus and kept i n several plastic pots. The unwanted materials like stones, gravels, pebbles, plant roots etc. were removed from the bulk soil. For this experiment, three plastic pots were used; each pot size was 70 cm in diameter and 24 cm in height. An adequate amount of soil was taken in each plastic pot. Then sufficient amount of water was poured into the each pot and kept for over night and mixed well. Then the pots were ready for seedling of germinated rice. Cold acclimation and arsenic treatment: Four plastic pots were prepared with soil and seeded with Oryza sativa. After I 0 days of germination, the four different pots were described as control, cold, arsenic (1 mM) plus cold and arsenic (10 mM) plus cold. Control pot was used for 24h, 48h and 72h treatments in the room temperature without cold acclimation.

Source of Information: Ann. Bangladesh Agric. (2010) 14 (1&2): 125-134

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Cold acclimation has been found to be a major abiotic stress causing the alteration of root inorganic phosphate in the growing paddy. Although the mechanism of the alteration in this molecule in root is not clarified, however, it might be linked to a variety of cellular metabolic pathways, either by formation of the ROS, rigidification of root cell membrane causing the exposure of calcium channel and thereby affecting the calcium ion signaling. It was found that during the development root growth, Pi was reduced in response to cold and higher arsenic potentially was involved to enhance cold induced effect. The alteration of Pi in root might be an index for the formation of ATP or its degradation to release Pi. Both these stimuli cause an adverse environment where the paddies survive however alteration of Pi is caused by the abiotic stresses of these effects.

Knowledge Management: Journal