Genotypic variations in grain yield and component traits of early and late maturing direct-seeded rice lines in the National Cooperative Tests (NCT)

Date

12-2015

Degree

Bachelor of Science in Agriculture

Major Course

Major in Agronomy

College

College of Agriculture and Food Science (CAFS)

Adviser/Committee Chair

Jose E. Hernandez

Restrictions

Restricted: Not available to the general public and for consultation with the author/thesis adviser. Access is available only to those bound by the confidentiality agreement.

Abstract

The study was conducted during the 2015 dry season to determine the component trait with the greatest influence on the grain yield of different early- and late- maturing NCT test entries in order to develop breeding strategy that would be effective in increasing the yield. The early (Group 1) and late (Group 2) maturing groups were each composed of 18 elite lines, including the check varieties. Data gathered were agronomic and yield components traits. Results showed that Group 1 had significant variations from the following traits: yield, days to maturity, plant height, dry matter production, 1000-grain weight, panicle length, per cent filled grain and number of spikelet while number of productive tillers was not significant. Likewise, significant variations were shown from yield, days to maturity, plant height, dry matter production, 1000-grain weight and panicle length of Group 2. No significant variations were observed from productive tillers and number of spikelet. The correlation analysis of Group 1 showed that yield has weak and direct correlation with plant height, productive tillers and 1000-grain weight, while inversely associated with days to maturity, dry matter production, panicle length, percent filled grain and number of spikelets. While significant and direct association to yield of Group 2 were observed from the traits days to maturity, plant height, panicle length and dry matter production. However, only the trait 1000-grain weight showed inverse relationship with yield. Results of Group 1 showed that the days to maturity had indirect effect to grain yield, as observed from the highest yielder, Index 4. While the highest yielder of Group 2, Index 21, showed that days to maturity, plant height and dry matter production highly affect grain yield. Therefore, shorter days to maturity is needed in selecting high yielding varieties for early maturing lines. While for late maturing lines, taller stature, longer days to maturity, longer panicles and highly producing dry matter must be considered in selecting for high yielding varieties.

Language

English

Location

UPLB Main Library Special Collections Section (USCS)

Call Number

LG 993.5 2015 A3 C36

Document Type

Thesis

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