Stability of selected rice genotypes under high temperature condition in Cagayan

Issue Date

7-2018

Abstract

Cagayan [Philippines] is one of the highest rice producers and also one of the hottest areas in the Philippines. Existing rice varieties have no known tolerance to heat stress, but still being planted by farmers in Cagayan due to their good performance. To determine the stability and adaptability under high temperature condition, these varieties together with two new heat-tolerant elite lines were planted in four municipalities of Cagayan. Based on AMMI analysis, variance due to genotype, environment and GEI were significant (P0.05). Environment contributed the greatest proportion which was 43.1% of the total variance, while genotype contributed 35.5%, and GEI 21.5%. Results also showed that the highest yielding genotype across environment was PR40330-42-7-12-1. Highest genotype for each location varied. In Iguig, the highest was PR40330-42-7-12-1, in Peñablanca and Solana, NSIC Rc218, and in Tuguegarao, NSIC Rc240. The highest yielding environment was Peñablanca. In terms of stability, NSIC Rc152 was the most stable followed by PR42026-34-1-33.2. Yield stability index was also computed and revealed NSIC Rc152 as the most desirable genotype followed by PR40330-42-7-12-1. Panicle and canopy temperature varied significantly across genotypes which range from 4.9-10.8 deg C. The significant differences between genotypes could be attributed to ability of genotypes to transpire and cool the canopy in response to high air temperature. This could be their way to adapt to high temperature condition.

Source or Periodical Title

Philippine Journal of Crop Science

ISSN

0115-463X

Volume

43

Issue

Supplement no. 1

Page

107

Document Type

Article

College

College of Agriculture and Food Science (CAFS)

Language

English

Subject

Oryza sativa L.;

En – AGROVOC descriptors

ORYZA SATIVA; GENOTYPES; ADAPTABILITY; TEMPERATURE; HEAT TOLERANCE; PHILIPPINES

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