Volume No. 6 Issue No.: 3A Page No.: 584-593 Jan-Mar 12

 

EFFECT OF INDUCED DROUGHT ON DIFFERENT GROWTH AND BIOCHEMICAL ATTRIBUTES OF BLACK GRAM (Vigna mungo L.) AND GREEN GRAM (Vigna radiata L.)

 

Bhaswatee Baroowa and Nirmali Gogoi*

Department of Environmental Science, Tezpur University, Tezpur, Assam (INDIA)

 

Received on : October 30, 2011

 

ABSTRACT

 

Drought is one of the major abiotic stresses which adversely affect crop growth and yield. Drought induced changes are mainly related to altered metabolic functions, such as reduced synthesis of photosynthetic pigments, accumulation of osmoprotectants like proline in the cell, decline in the cell membrane stability and alterations in physiological parameters including plant height, leaf area and cell membrane stability. A study was conduct- ed during January-April,2010 in the experimental field of Tezpur University, Assam with two major pulses black gram (Vigna mungo L., cv. PU19) and green gram (Vigna radiata L., cv. Pratap) to see the biochemical as well as physiological changes resulting from exposure to various osmotic stress intensities and subsequent relief of the same. Accumulation of proline in leaves was found to be increased during stressed period and decreased in the subsequent recovery stages. Watering was done regularly up to 36 days until the plants were grown to an average height of 4 cm. Then watering was stopped and a condition of water deficit was maintained for 10 days, 15 days and 20 days in each type of plants and labeled as T1, T2 and T3 respectively. Reduction in all the other parameters was observed during stressed period with substantial increase in recovery stage followed by net reduction in yield. Positive correlations of soil moisture with leaf chlorophyll, chlorophyll stability index, plant height, leaf area, cell membrane stability and yield were obtained while it is found to be negatively correlated with leaf Proline concentration. Black gram variety PU19 was found to be more resistant than green gram vari- ety pratap against drought stress.

 

Keywords : Proline, Chlorophyll, Plant height, Leaf area, Cell membrane stability, Yields

 

 

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