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ZJUS-B
Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology)  2005, Vol. 6 Issue ( 5): 15-    DOI: 10.1631/jzus.2005.B0389
    
Effect of seedling age and water depth on morphological and physiological aspects of transplanted rice under high temperature
KHAKWANI Abdul Aziz, SHIRAISHI Masaaki, ZUBAIR Muhammad, BALOCH Mohammad Safdar, NAVEED Khalid, AWAN Inayatullah
Agricultural Research Institute, Dera Ismail Khan, NWFP, Pakistan; Japan International Cooperation Agency, Tsukuba International Centre, Tsukuba Ibaraki, Japan; Faculty of Agriculture, Gomal University, Dera Ismail Khan, NWFP, Pakistan
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Abstract  To study the effect of high temperature, rice seedlings 20, 30, 40 and 50 d were kept at 5, 10, 15 and 20 cm water depth in a water pool. Meteorological findings indicated that water temperature varied up to 10 cm but became stable below this depth. Deep water inflicted higher tiller mortality, minimal increase in dry weight of aerial parts and leaf area, decrease in root length, and decrease in root dry weight especially at 20 cm water depth and produced an unbalanced T/R ratio (top versus root dry weight). However, deep water tended to increase plant length. These parameters, however, excel in shallow water. Older seedlings, with the exception of root dry weight, could not perform well compared to young seedlings in all physiological and morphological aspects. The study revealed that seedlings, particularly young ones, stand well in shallow water and can cope with high temperature.

Key words： Agriculture Rice      High temperature      Seedling age      Water depth     
Received: 19 August 2004     
CLC:  S511  
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KHAKWANI Abdul Aziz
SHIRAISHI Masaaki
ZUBAIR Muhammad
BALOCH Mohammad Safdar
NAVEED Khalid
AWAN Inayatullah
Cite this article:

KHAKWANI Abdul Aziz, SHIRAISHI Masaaki, ZUBAIR Muhammad, BALOCH Mohammad Safdar, NAVEED Khalid, AWAN Inayatullah. Effect of seedling age and water depth on morphological and physiological aspects of transplanted rice under high temperature. Journal of Zhejiang University-SCIENCE B (Biomedicine & Biotechnology), 2005, 6( 5): 15-.

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http://www.zjujournals.com/xueshu/zjus-b/10.1631/jzus.2005.B0389     OR     http://www.zjujournals.com/xueshu/zjus-b/Y2005/V6/I 5/15

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