TITLE:
Responses of Rice Mini-Core Collection Accessions to Damage by Diatraea saccharalis (Fabricius) Stem Borer
AUTHORS:
Jacqueline Barbosa Nascimento, José Alexandre de Freitas Barrigossi
KEYWORDS:
Rice, Sugarcane Borer, Morphological Traits, Resistance
JOURNAL NAME:
Agricultural Sciences,
Vol.5 No.9,
July
31,
2014
ABSTRACT:
This study aimed to observe the response of 32 rice
accessions to attack of sugarcane borer (Diatraea
saccharalis Fabr., 1794). Twenty larvae were placed on the leaf sheaths of
rice plants. At 30 days after infestation, the rice plants were cut at ground
level and taken to the laboratory to analyse the signs of borer attack, external and internal diameter of the
stem and weight of surviving larvae. The results of the morphological traits of the rice plant, response of the
plant to insect attack and development of the sugarcane borer larvae indicated
a genotypic variation. The accessions that most favored larval survivals were
IRAT 124 and MEARIN. Larvae with highest weight (0.0643 g) were found in IAPAR
L 99-98 and the largest internal diameters of the rice stem (5.65 mm) were
found in LAC 12. These accessions (IRAT 124, MEARIN, IAPAR L 99-98 and LAC 12)
remained morphologically grouped with IAC 47, cultivar susceptible to sugarcane
borer. The most tolerant materials based on the ability to produce new tillers after larval infestation
were BR IRGA 417 and MTU 15. The results of this study indicate that all the
morphological traits were able to separate the accessions of rice into
different groups in relation to resistance to the sugarcane borer D.
saccharalis. These materials can be used as donor sources in pre-breeding
for genetic resistance to sugarcane borers.