Assessing response variation of selected rice genotypes under waterlogged condition
Issue Date
7-2018
Abstract
Next to flash-flooding, stagnant water stress due to gradual increase in water level up to 80cm lasting for weeks or months has been a bottleneck in rice cultivation in submergence-prone areas. To address this concern, a genotype screening protocol and small scale facility was developed to assess the performance of rice genotypes under stagnant water condition. NSIC Rc222, PSB Rc68, IR242, IR46 and four mutant-lines were used as test genotypes and 1cum plastic water tanks with steel braces were used as screening facility. The 21-day old seedlings were planted in pots containing approximately 2kg of paddy soil. Stress was imposed 10 days after transplanting starting at 5cm from the base of the plant. Water level was raised by 5 cm at 2-day interval until it reaches 50cm, and maintained until harvest stage. Significant variation in maturity among genotypes observed, with IR64 and kawilan-IVC2011WS 324-6 maturing earliest with 105 DAS, and IR42 maturing the latest (123 DAS). Significant variation was observed in average in average internode distance, culm diameter, panicle number, and root length were identified as contributing traits explaining 78.84% of observed variation. A significant positive linear correlation in number of nodes with culm diameter, (r=0.9300) was generated. Axillary branch development was observed in IR42, PSB Rc68, PR41908-Tanggiling-IVC2010DS 6-2, and Kawilan-IVC2011WS 324-6 producing 1-2 branches from the main tiller, usually initiating at the 4th node from the base. All genotypes were observed to have aerenchyma formation in the root and stem as adaptive mechanism for anoxia due to waterlogged condition. Significant variation in response of rice genotypes under stagnant water condition was elucidated. To further establish and quantify the severity of stress, a second phase trial will be conducted comparing stress condition with non-stress condition.
Source or Periodical Title
Philippine Journal of Crop Science
ISSN
0115-463X
Volume
43
Issue
Supplement no. 1
Page
72
Document Type
Article
Language
English
Subject
Rice ; Drought-tolerant plants; Waterlogging (Soils)
Recommended Citation
Concepcion, J. S. and Desamero, N. V., "Assessing response variation of selected rice genotypes under waterlogged condition" (2018). Journal Article. 4624.
https://www.ukdr.uplb.edu.ph/journal-articles/4624
En – AGROVOC descriptors
ORYZA SATIVA; GENOTYPES; DROUGHT STRESS; WATERLOGGING; GROWTH; INTERNODES