Flowering pattern and heat tolerance of mega-varieties and identification of early-morning flowering Near Isogenic Lines (NIL) with IR64 genetic background in rice (Oryza sativa L.) using SSR markers.

Date

4-2013

Degree

Bachelor of Science in Biology

College

College of Arts and Sciences (CAS)

Committee Member

Mendioro, Merlyn S. Ishimaru, Tsutomu

Abstract

Aside from heat tolerance, Early-Morning Flowering (EMF) in rice (Oryza sativa L.) was confirmed to be an active way to reduce spikelet sterility which is affected by high temperature. By flowering earlier in the morning when temperature is low, the problem of spikelet sterility is reduced. In this study, flowering pattern and heat tolerance of different Asian mega-varieties were compared to NENNN, a developed Near Isogenic Line (NIL) with the (EMF-NIL). Varieties with late-morning flowering and heat susceptibility were identified for they are candidates for the introgression of the EMF trait. A NIL with EMF trait was developed and identified through Marker-Assisted Selection (MAS) using SSR. The flowering pattern of the developed EMF-NIL with IR64 background was evaluated in an irrigated field. Results showed that all mega-varieties were flowering later than NENNN which confirmed the usefulness of NENNN as a donor parent for the EMF trait. Heat susceptible varieties include Moroberekan (highly susceptible), NENNN, Nanjin 11, IR64, and TDK 1 (moderately susceptible). An EMF-NIL with IR64 genetic background was also developed in this study. Evaluation of this NIL in an irrigated field confirmed the successful introgression of the EMF trait into IR64 through MAS.

Language

English

Location

UPLB Main Library Special Collections Section

Call Number

Thesis

Document Type

Thesis

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