Genetic diversity study based on seed morphology of rice landraces from Kota Belud, Sabah

Chua, Iris Yien Ping (2011) Genetic diversity study based on seed morphology of rice landraces from Kota Belud, Sabah. Universiti Malaysia Sabah. (Unpublished)

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Abstract

The measurement of morphological variation is the easiest indicator of genetic diversity. Rice landraces often exhibit tremendous morphological diversity. Exploring diversity in a collection of rice landraces is very important for identifying new, undiscovered genes and further improvement of germplasm. Hence, this study was carried out to determine the seed morphological variation of 45 rice landraces which were obtained from Kota Belud, Sabah. A total of 13 seed morphological characteristics, namely awning, awn colour, apiculus colour, lemma and palea colour, lemma and palea pubescence, sterile lemma colour, sterile lemma length, seed length, seed shape (length-width ratio), 100-grain weight, seed coat colour, endosperm type, and scent were evaluated based on the descriptor set by IBPGR-IRRl. Observations on the morphological characters of seed were recorded and analyzed by using Microsoft Excel. Shannon-Weaver diversity index, H'was used to estimate each characteristic's diversity index. The H'value of awning, awn colour, apiculus colour, lemma and palea colour, lemma and palea pubescence, sterile lemma colour, sterile lemma length, seed coat colour, endosperm type and scent was 0.3460, 0.4292, 0.5409, 0.2444, 0.2944, 0.3656, 0.2257, 0.1479, 0.6296 and 0.6126, respectively. The diversity index, H'was found to range from 0.1479 to 0.6296 in this study. The overall H' value was 0.4913. As for the quantitative parameters, 100-grain weight ranged from 1.76 g to 3.29 g. Seed length ranged from 5.4 mm to 7.9 mm whereas width ranged from 1.9mm to 2.9 mm. The varying degree of the mixed characteristics is due to many genes that are responsible in controlling one characteristic. As a conclusion, Sabah rice landraces posses a range of diversity in their morphology. Such diversity is an important reservoir of useful genes which can be used to enrich the existing varieties with essential favourable agronomic traits.

Item Type: Academic Exercise
Uncontrolled Keywords: Rice landraces, diversity, germplasm, seed morphological
Subjects: S Agriculture > SB Plant culture
Divisions: FACULTY > Faculty of Sustainable Agriculture
Depositing User: Users 83 not found.
Date Deposited: 06 Jun 2017 04:08
Last Modified: 13 Oct 2017 06:23
URI: http://eprints.ums.edu.my/id/eprint/17054

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