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)

En – AGROVOC descriptors

ORYZA SATIVA; GENOTYPES; DROUGHT STRESS; WATERLOGGING; GROWTH; INTERNODES

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