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Published online 20 June 2006
Published in Crop Sci 46:1673-1681 (2006)
© 2006 Crop Science Society of America
677 S. Segoe Rd., Madison, WI 53711 USA
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Right arrow Crop Physiology & Metabolism

Seedling Nutrient Status before Submergence Affects Survival after Submergence in Rice

Evangelina S. Ella and Abdelbagi M. Ismail*

Crop, Soil, and Water Sciences Division, International Rice Research Institute DAPO, Box 7777, Metro Manila, Philippines


Figure 1
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  		Fig. 1. Effect of fertilizer treatment before submergence on survival of FR13A ({square}) and IR42 ({blacksquare}) after submergence in (a) Experiment I (IA and IB combined), (b) Experiment IIA, and (c) Experiment IIB. Data are averages of five replications in each experiment and vertical bars are LSD0.05 values.

 

Figure 2
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  		Fig. 2. Effect of N and P applied before submergence on chlorophyll concentration. Data are combined means of FR13A and IR42 with five replications each in Experiment IIB. Vertical bar is LSD0.05 value.

 

Figure 3
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  		Fig. 3. Effect of fertilizer treatment before submergence on relative chlorophyll concentration after submergence of (a) FR13A ({square}) and IR42 ({blacksquare}) at Day 3 of recovery after submergence in Experiment IB and (b) across two soil types at Day 0 of recovery after submergence in Experiment IIB. Values are means of five replications in each experiment and vertical bars are LSD0.05 values.

 

Figure 4
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  		Fig. 4. Effect of time of N treatment before submergence on (a) chlorophyll a and chlorophyll b content of FR13A ({square}) and IR42 ({blacksquare}) and (b) chlorophyll a/b molar ratio of the not-submerged and submerged plants at 3 d after submergence. Data are means of five replications in Experiment IB and vertical bars are LSD0.05 values.

 

Figure 5
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  		Fig. 5. Effect of time of N treatment before submergence on chlorophyllase activity in control ({square}) and submerged ({blacksquare}) seedlings of FR13A and IR42 at Day 0 of recovery after submergence. Data are means of five replications in Experiment IA and the vertical bar represents the LSD0.05 value.

 

Figure 6
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  		Fig. 6. Relationship between leaf N content before submergence and photosynthetic gas exchange rate measured at Day 3 of recovery after submergence in FR13A ({square}) and IR42 ({blacksquare}) in experiment IA. Data points represent three measurements in each of 3 N treatments. ** P < 0.01.

 




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